Preliminary W942508AH
8M
×
4 BANKS
×
8 BIT DDR SDRAM
Publication Release Date: August 6, 2001
- 1 - Revision A1
Table of Contents-
1. GENERAL DESCRIPTION..................................................................................................................3
2. FEATURES..........................................................................................................................................3
3. KEY PARAMETERS............................................................................................................................3
4. PIN CONFIGURATION........................................................................................................................4
5. PIN DESCRIPTION .............................................................................................................................5
6. BLOCK DIAGRAM...............................................................................................................................6
7. ABSOLUTE MAXIMUM RATINGS ......................................................................................................7
8. RECOMMENDED DC OPERATING CONDITIONS............................................................................7
9. CAPACITANCE ...................................................................................................................................8
10. LEAKAGE AND OUTPUT BUFFER CHARACTERISTICS...............................................................8
11. DC CHARACTERISTICS...................................................................................................................9
12. AC CHARACTERISTICS AND OPERATING CONDITION.............................................................10
13. AC TEST CONDITIONS..................................................................................................................11
14. OPERATION MODE........................................................................................................................13
Simplified Truth Tabl.............................................................................................................................. 13
Function Truth Table ............................................................................................................................. 14
Function Truth Table for CKE................................................................................................................ 17
15. SIMPLIFIED STATE DIAGRAM ......................................................................................................18
16. FUNCTIONAL DESCRIPTION ........................................................................................................19
Power Up Sequence.............................................................................................................................. 19
Command Function............................................................................................................................... 19
Read Operation..................................................................................................................................... 22
Write Operation ..................................................................................................................................... 22
Precharge.............................................................................................................................................. 22
Burst Termination.................................................................................................................................. 23
Refresh Operation................................................................................................................................. 23
Power Down Mode................................................................................................................................ 23
Mode Register Operation ...................................................................................................................... 23
17. TIMING WAVEFORMS....................................................................................................................27
Command Input Timing......................................................................................................................... 27
Timing of the CLK Signals..................................................................................................................... 27
Read Timing (Burst Length = 4) ............................................................................................................ 28
Preliminary W942508AH
- 2 -
Write Timing (Burst Length = 4)............................................................................................................. 29
DM, DATA MASK (W942508AH/W942504AH)..................................................................................... 30
DM, DATA MASK (W942516AH).......................................................................................................... 30
Mode Register Set (MRS) Timing.......................................................................................................... 31
Extend Mode Register Set (EMRS) Timing........................................................................................... 32
Auto Precharge Timing (Read cycle, CL = 2)........................................................................................ 33
Auto Precharge Timing (Write Cycle).................................................................................................... 35
Read Interrupted by Read (CL = 2, BL = 2, 4, 8)................................................................................... 36
Burst Read Stop (BL = 8) ...................................................................................................................... 36
Read Interrupted by Write & BST (BL = 8)............................................................................................ 37
Read Interrupted by Precharge (BL = 8) ............................................................................................... 37
Write Interrupted by Write (BL = 2, 4, 8)................................................................................................ 38
Write Interrupted by Read (CL = 2, BL = 8)........................................................................................... 38
Write Interrupted by Read (CL = 2.5, BL = 4)........................................................................................ 39
Write Interrupted by Precharge (BL = 8)................................................................................................ 39
2 Bank Interleave Read Operation (CL = 2, BL = 2).............................................................................. 40
2 Bank Interleave Read Operation (CL = 2, BL = 4).............................................................................. 40
4 Bank Interleave Read Operation (CL = 2, BL = 2).............................................................................. 41
4 Bank Interleave Read Operation (CL = 2, BL = 4).............................................................................. 41
Auto Refresh Cycle................................................................................................................................ 42
Active Power Down Mode Entry and Exit Timing.................................................................................. 42
Precharged Power Down Mode Entry and Exit Timing ......................................................................... 42
Self Refresh Entry and Exit Timing........................................................................................................ 43
18. PACKAGE DIMENSION..................................................................................................................44
TSOP 66l – 400 mil ............................................................................................................................... 44
Preliminary W942508AH
Publication Release Date:August 6, 2001
- 3 - Revision A1
1. GENERAL DESCRIPTION
W942508AH is a CMOS Double Data Rate synchronous dynamic random access memory (DDR
SDRAM), organized as 8,388,608 words × 4 banks × 8 bits. Using pipelined architecture and 0.175 µm
process technology, W942508AH delivers a data bandwidth of up to 286M words per second (-7). To
fully comply with the personal computer industrial standard, W942508AH is sorted into three speed
grades: -7, -75 and -8. The -7 is compliant to the 143 MHz/CL2.5 or DDR266/CL2 specification, the -
75 is compliant to the DDR266/CL2.5 specification, the -8 is compliant to the DDR200/CL2
specification
All Inputs reference to the positive edge of CLK (except for DQ, DM, and CKE). The timing reference
point for the differential clock is when the CLK and CLK signals cross during a transition. And Write
and Read data are synschronized with the both edges of DQS (Data Strobe).
By having a programmable Mode Register, the system can change burst length, latency cycle,
interleave or sequential burst to maximize its performance. W942508AH is ideal for main memory in
high performance applications.
2. FEATURES
• 2.5V ±0.2V Power Supply
• Up to 143 MHz Clock Frequency
• Double Data Rate architecture; two data transfers per clock cycle
• Differential clock inputs (CLK and CLK )
• DQS is edge-aligned with data for Read; center-aligned with data for Write
• CAS Latency: 2 and 2.5
• Burst Length: 2, 4 and 8
• Auto Refresh and Self Refresh
• Precharged Power Down and Active Power Down
• Write Data Mask
• Write Latency = 1
• 8K Refresh cycles / 64 mS
• Interface: SSTL-2
• Packaged in TSOP II 66-pin, 400 x 875 mil, 0.65mm pin pitch
3. KEY PARAMETERS
SYM.
DESCRIPTION MIN./MAX.
-7 -75 -8
tCK Clock Cycle Time CL = 2 Min. 7.5 nS
8 nS
10 nS
CL = 2.5 Min. 7 nS
7.5 nS
8 nS
tRAS Active to Precharge Command Period Min. 45 nS
45 nS
50 nS
tRC Active to Ref/Active Command Period Min. 65 nS
65 nS
70 nS
IDD1 Operation Current (Single bank) Max. 110 mA
110 mA
100 mA
IDD4 Burst Operation Current Max. 165 mA
155 mA
150 mA
IDD6 Self-Refresh Current Max. 3 mA
3 mA
3 mA
Preliminary W942508AH
- 4 -
4. PIN CONFIGURATION
VSS
DQ7
VSSQ
NC2
DQ6
VDDQ
NC2
DQ5
VSSQ
NC2
DQ4
VDDQ
NC2
VSS
NC1
DQS
CLK
CKE
A11
A9
A8
A7
A6
A5
A4
VSS
66
65
64
63
62
61
60
59
58
57
56
55
54
53
52
51
50
49
48
47
46
45
44
43
42
41
40
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
VDD
DQ0
VDDQ
NC2
DQ1
VSSQ
NC2
DQ2
VDDQ
NC2
DQ3
VSSQ
NC2
NC1
VDDQ
BS0
BS1
A10/AP
A0
A1
A2
A3
CS
RAS
CAS
WE
28
29
30
31
32
33
39
38
37
36
35
34VDD
NC2
NC1
NC2
NC1
VDD
NC1
VSSQ
NC1
A12
NC1
CLK
DM
VREF
Preliminary W942508AH
Publication Release Date:August 6, 2001
- 5 - Revision A1
5. PIN DESCRIPTION
PIN NUMBER
PIN NAME
FUNCTION DESCRIPTION
28−32, 35−42 A0 − A12 Address Multiplexed pins for row and column address.
Row address: A0 − A12.
Column address: A0 − A9. (A10 is used for Auto Precharge)
26, 27 BS0, BS1
Bank Select Select bank to activate during row address latch time, or bank
to read/write during column address latch time.
2, 5, 8, 11, 56,
59, 62, 65 DQ0 − DQ7
Data Input/
Output The DQ0 – DQ7 input and output data are synchronized with
both edges of DQS.
51 DQS Data Strobe DQS is Bi-directional signal. DQS is input signal during write
operation and output signal during read operation. It is Edge-
aligned with read data, Center-aligned with write data.
24 CS Chip Select Disable or enable the command decoder. When command
decoder is disabled, new command is ignored and previous
operation continues.
23, 22, 21 RAS , CAS
,
WE Command
Inputs Command inputs (along with CS ) define the command being
entered.
47 DM Write mask When DM is asserted "high" in burst write, the input data is
masked. DM is synchronized with both edges of DQS.
45, 46 CLK, CLK
Differential
clock inputs
All address and control input signals are sampled on the
crossing of the positive edge of CLK and negative edge of
CLK .
44 CKE Clock Enable
CKE controls the clock activation and deactivation. When CKE
is low, Power Down mode, Suspend mode, or Self Refresh
mode is entered.
49 VREF Reference
Voltage VREF is reference voltage for inputs.
1, 18, 33 VDD Power (+2.5)
Power for logic circuit inside DDR SDRAM.
34, 48, 66 VSS Ground Ground for logic circuit inside DDR SDRAM.
3, 9, 15, 55, 61
VDDQ Power (+2.5V)
for I/O buffer
Separated power from VDD, used for output buffer, to improve
noise.
6, 12, 52, 58, 64
VSSQ Ground for I/O
buffer Separated ground from VSS, used for output buffer, to improve
noise.
4, 7, 10, 13, 14,
16, 17, 19, 20,
25, 43, 50, 53,
54, 57, 60, 63
NC1, NC2
No Connection
No connection
Preliminary W942508AH
- 6 -
6. BLOCK DIAGRAM
DQS
CKE
A10
DLL
CLOCK
BUFFER
COMMAND
DECODER
ADDRESS
BUFFER
REFRESH
COUNTER
COLUMN
COUNTER
CONTROL
SIGNAL
GENERATOR
MODE
REGISTER
COLUMN DECODER
SENSE AMPLIFIER
CELL ARRAY
BANK #2
COLUMN DECODER
SENSE AMPLIFIER
CELL ARRAY
BANK #0
COLUMN DECODER
SENSE AMPLIFIER
CELL ARRAY
BANK #3
DATA CONTROL
CIRCUIT
DQ
BUFFER
COLUMN DECODER
SENSE AMPLIFIER
CELL ARRAY
BANK #1
NOTE:
The cell array configuration is 8912 * 1024 * 8
ROW DECODER ROW DECODER
ROW DECODERROW DECODER
A0
A9
A11
A12
BA0
BA1
CS
RAS
CAS
WE
CLK
CLK
DM
DQ0
DQ7
PREFETCH REGISTER
Preliminary W942508AH
Publication Release Date:August 6, 2001
- 7 - Revision A1
7. ABSOLUTE MAXIMUM RATINGS
PARAMETER SYMBOL RATING UNIT
Input/Output Voltage VIN, VOUT -0.3 ~ VDDQ +0.3 V
Power Supply Voltage VDD, VDDQ -0.3 ~ 3.6 V
Operating Temperature TOPR 0 ~ 70 °C
Storage Temperature TSTG -55 ~ 150 °C
Soldering Temperature (10s) TSOLDER 260 °C
Power Dissipation PD 1 W
Short Circuit Output Current IOUT 50 mA
8. RECOMMENDED DC OPERATING CONDITIONS
(TA = 0 to 70°C)
SYMBOL
PARAMETER MIN. TYP. MAX. UNIT
NOTES
VDD Power Supply Voltage 2.3 2.5 2.7 V 2
VDDQ Power Supply Voltage (for I/O
Buffer) 2.3 2.5 VDD V 2
VREF Input reference Voltage 0.49 x VDDQ
0.50 x VDDQ
0.51 x VDDQ
V 2, 3
VTT Termination Voltage (System) VREF -0.04 VREF VREF +0.04 V 2, 8
VIH (DC) Input High Voltage (DC) VREF +0.15 - VDDQ +0.3 V 2
VIL (DC) Input Low Voltage (DC) -0.3 - VREF -0.15 V 2
VICK (DC) Differential Clock DC Input
Voltage -0.3 - VDDQ +0.3 V 15
VID (DC) Input Differential Voltage. CLK
and CLK inputs (DC) 0.36 - VDDQ +0.6 V 13, 15
VIH (AC) Input High Voltage (AC) VREF +0.31 - - V 2
VIL (AC) Input Low Voltage (AC) - - VREF -0.31 V 2
VID (AC) Input Differential Voltage. CLK
and CLK inputs (AC) 0.7 - VDDQ +0.6 V 13, 15
VX (AC) Differential AC input Cross
Point Voltage VDDQ/2 -0.2
- VDDQ/2 +0.2
V 12, 15
VISO (AC) Differential Clock AC Middle
Point VDDQ/2 -0.2
- VDDQ/2 +0.2
V 14, 15
Notes: Undershoot Limit: VIL (min) = -0.9V with a pulse width < 5 nS
Overshoot Limit: VIH (max) = VDDQ +0.9V with a pulse width < 5 nS
VIH (DC) and VIL (DC) are levels to maintain the current logic state.
VIH (AC) and VIL (AC) are levels to change to the new logic state.
Preliminary W942508AH
- 8 -
9. CAPACITANCE
(VDD = VDDQ = 2.5V ±0.2V, f = 1 MHz, TA = 25°C, VOUT (DC) = VDDQ/2, VOUT (Peak to Peak) = 0.2V)
SYMBOL
PARAMETER MIN. MAX. DELTA
(MAX.) UNIT
CIN Input Capacitance (except for CLK pins) 2.0 3.0 0.5 pF
CCLK Input Capacitance (CLK pins) 2.0 3.0 0.25 pF
CI/O DQ, DQS, DM Capacitance 4.0 5.0 0.5 pF
CNC1 NC1 Pin Capacitance - 1.5 - pF
CNC2 NC2 Pin Capacitance 4.0 5.0 - pF
Notes: These parameters are periodically sampled and not 100% tested.
The NC2 pins have additional capacitance for adjustment of the adjacent pin capacitance.
The NC2 pins have Power and Ground clamp.
10. LEAKAGE AND OUTPUT BUFFER CHARACTERISTICS
SYMBOL
PARAMETER MIN. MAX. UNITS
NOTES
II(L) Input Leakage Current
(0V < VIN < VDDQ, All other pins not under test =
0V) -2 2 µA
IO(L) Output Leakage Current
(Output disabled, 0V < VOUT < VDDQ) -5 5 µA
VOH Output High Voltage
(under AC test load condition) VTT +0.76
- V
VOL Output Low Voltage
(under AC test load condition) - VTT -0.76
V
IOH (DC) Output Minimum Source DC Current -15.2 - mA 4, 6
IOL (DC) Output Minimum Sink DC Current
Full
Strength
15.2 - mA 4, 6
IOH (DC) Output Minimum Source DC Current -10.4 - mA 5
IOL (DC) Output Minimum Sink DC Current Half
Strength
10.4 - mA 5
Preliminary W942508AH
Publication Release Date:August 6, 2001
- 9 - Revision A1
11. DC CHARACTERISTICS
Max.
SYM. PARAMETER -7 -75
-8 UNIT
NOTES
IDD0 OPERATING CURRENT: One Bank Active-Precharge; tRC = tRC min;
tCK = tCK min; DQ, DM and DQS inputs changing twice per clock cycle;
Address and control inputs changing once per clock cycle 110
110
100
7
IDD1 OPERATING CURRENT: One Bank Active-Read-Precharge; Burst =
2; tRC = tRC min; CL = 2.5; tCK = tCK min; IOUT = 0 mA; Address and
control inputs changing once per clock cycle. 110
110
100
7,9
IDD2P PRECHARGE-POWER-DOWN STANDBY CURRENT: All Banks Idle;
Power down mode; CKE < VIL max; tCK = tCK min; Vin = VREF for DQ,
DQS and DM 2 2 2
IDD2F IDLE FLOATING STANDBY CURRENT: CS > VIH min; All Banks
Idle; CKE > VIH min; Address and other control inputs changing once
per clock cycle; Vin = Vref for DQ, DQS and DM 45 40 35 7
IDD2N IDLE STANDBY CURRENT: CS > VIH min; All Banks Idle; CKE >
VIH min; tCK = tCK min; Address and other control inputs changing once
per clock cycle; Vin > VIH min or Vin < VIL max for DQ, DQS and DM 45 40 35 7
IDD2Q IDLE QUIET STANDBY CURRENT: CS > VIH min; All Banks Idle;
CKE > VIH min; tCK = tCK min; Address and other control inputs stable;
Vin > VREF for DQ, DQS and DM 40 35 30 mA 7
IDD3P ACTIVE POWER-DOWN STANDBY CURRENT: One Bank Active;
Power down mode; CKE < VIL max; tCK = tCK min 20 20 20
IDD3N
ACTIVE STANDBY CURRENT: CS > VIH min; CKE > VIH min; One
Bank Active-Precharge; tRC = tRAS max; tCK = tCK min; DQ, DM and
DQS inputs changing twice per clock cycle; Address and other control
inputs changing once per clock cycle
70 65 60 7
IDD4R OPERATING CURRENT: Burst = 2; Reads; Continuous burst; One
Bank Active; Address and control inputs changing once per clock
cycle; CL=2.5; tCK = tCK min; IOUT = 0mA 165
155
150
7,9
IDD4W
OPERATING CURRENT: Burst = 2; Write; Continuous burst; One
Bank Active; Address and control inputs changing once per clock
cycle; CL = 2.5; tCK = tCK min; DQ, DM and DQS inputs changing twice
per clock cycle
165
155
150
7
IDD5 AUTO REFRESH CURRENT: tRC = tRFC min 190
190
170
7
IDD6 SELF REFRESH CURRENT: CKE < 0.2V 3 3 3
IDD7
RANDOM READ CURRENT: 4 Banks Active Read with activate every
20ns, Auto-Precharge Read every 20 nS; Burst = 4; tRCD = 3; IOUT =
0mA; DQ, DM and DQS inputs changing twice per clock cycle;
Address changing once per clock cycle
270
270
270
CK
CK
DQS
RANDOM READ CURRENT Timing
t
RCD
t
RC
t
CK = 10ns
(
I
DD7)
Bank 0
Row d Bank 3
Row c Bank 1
Row e Bank 1
Row e
ADDRESS Bank 0
Row d Bank 2
Row f Bank 3
Row q Bank 2
Col f
READ
AP ACT READ
AP
COMMAND READ
AP ACT ACT READ
AP ACT
DQ Qa Qb Qb Qb Qb Qc Qc Qc Qc Qd Qd Qd Qd Qe QeQa
Bank 0
Row h
ACT
Bank 0
Col d
READ
AP ACTACTACT ACT
Bank 1
Col e
Bank 2
Row f Bank 3
Row q Bank 2
Col f Bank 0
Row h
READ
AP
Bank 1
Row e
Bank 3
Col c
Bank 0
Row d
Preliminary W942508AH
- 10 -
12. AC CHARACTERISTICS AND OPERATING CONDITION
(Notes: 10, 12)
-70 -75 -80
SYM.
PARAMETER MIN.
MAX.
MIN.
MAX.
MIN.
MAX. UNITS
NOTES
tRC Active to Ref/Active Command Period 65 65 70
tRFC Ref to Ref/Active Command Period 75 75 80
tRAS Active to Precharge Command Period 45 100000
45 100000
50 100000
tRCD Active to Read/Write Command Delay Time 15 15 20
tRAP Active to Read with Auto Precharge enable 15 15 20
nS
tCCD Read/Write(a) to Read/Write(b) Command Period 1 1 1 tCK
tRP Precharge to Active Command Period 20 20 20
tRRD Active(a) to Active(b) Command Period 15 15 15
tWR Write Recovery time 15 15 15
tDAL Auto Precharge Write Recovery + Precharge time 30 30 35
CL = 2 7.5 15 8 15 10 15 tCK CLK Cycle Time CL = 2.5 7 15 7.5 15 8 15
tAC Data Access time from CLK, CLK -0.75
0.75 -0.75
0.75 -0.8 0.8
tDQSCK
DQS output access time from CLK, CLK -0.75
0.75 -0.75
0.75 -0.8 0.8 16
tDQSQ
Data Strobe Edge to Output Data Edge Skew 0.5 0.5 0.6
nS
tCH CLk High Level Width 0.45 0.55 0.45 0.55 0.45 0.55
tCL CLK Low Level Width 0.45 0.55 0.45 0.55 0.45 0.55 tCK 11
tHP CLK Half Period (minimum of actual tCH, tCL) min
(tCL,tCH)
min
(tCL,tCH)
min
(tCL,tCH)
tQH DQ Output Data Hold Time from DQS tHP
-0.75
tHP
-0.75
tHP-1.0
nS
tRPRE DQS Read Preamble Time 0.9 1.1 0.9 1.1 0.9 1.1
tRPST DQS Read Postamble Time 0.4 0.6 0.4 0.6 0.4 0.6 tCK 11
tDS DQ and DM Setup Time 0.5 0.5 0.6
tDH DQ and DM Hold Time 0.5 0.5 0.6
tDIPW DQ and DM Input Pulse Width (for each input) 1.75 1.75 2 nS
tDQSH
DQS Input High Pulse Width 0.35 0.35 0.35
tDQSL DQS Input Low Pulse Width 0.35 0.35 0.35
tDSS DQS Falling Edge to CLK Setup Time 0.2 0.2 0.2
tDSH DQS Falling Edge Hold Time from CLK 0.2 0.2 0.2
tCK 11
tWPRES
Clock to DQS Write Preamble Set-up Time 0 0 0 nS
tWPRE
DQS Write Preamble Time 0.25 0.25 0.25
tWPST
DQS Write Postamble Time 0.4 0.4 0.4
tDQSS Write Command to First DQS Latching Transition
0.75 1.25 0.75 1.25 0.75 1.25 11
tDSSK UDQS – LDQS Skew (x16) -0.25
0.25 -0.25
0.25 -0.25
0.25
tCK
tIS Input Setup Time 0.9 0.9 1.2
tIH Input Hold Time 0.9 0.9 1.2
tIPW Control & Address Input Pulse Width (for each
input) 2.2 2.2 2.5
tHZ Data-out High-impedance Time from CLK,CLK -0.75
0.75 -0.75
0.75 -0.8 0.8
tLZ Data-out Low-impedance Time from CLK,CLK -0.75
0.75 -0.75
0.75 -0.8 0.8
tT(SS) SSTL Input Transition 0.5 1.5 0.5 1.5 0.5 1.5
nS
tWTR Internal Write to Read Command Delay 1 1 1 tCK
tXSNR Exit Self Refresh to non-Read Command 75 75 80 ns
tXSRD Exit Self Refresh to Read Command 10 10 10 tCK
tREF Refresh Time (8k) 64 64 64 mS
tMRD Mode Register Set Cycle Time 15 15 16 nS
Preliminary W942508AH
Publication Release Date:August 6, 2001
- 11 - Revision A1
13. AC TEST CONDITIONS
SYMBOL PARAMETER VALUE UNIT
VIH Input High voltage (AC) VREF + 0.31 V
VIL Input Low voltage (AC) VREF - 0.31 V
VREF Input reference voltage 0.5 x VDDQ V
VTT Termination voltage 0.5 x VDDQ V
VSWING Input signal peak to peak swing 1.0 V
Vr Differential Clock Input Reference Voltage Vx (AC) V
VID(AC) Input Difference Voltage. CLK and CLK inputs
(AC) 1.5 V
SLEW Input signal minimum slew rate 1.0 V/ns
VOTR Output timing measurement reference voltage 0.5 x VDDQ V
V
SWING (MAX)
V
DD
Q
V
SS
TT
V
IH
min (AC)
V
REF
V
IL
max (AC)
SLEW = (V
IH
min (AC) - V
IL
max (AC)) /
T
Output
R
T
= 50 ohms
VTT
A.C. TEST LOAD (A)
Z = 50 ohms
output 30pF
Measurement point
Notes:
(1) Conditions outside the limits listed under "ABSOLUTE MAXIMUM RATINGS" may cause permanent damage to the
device.
(2) All voltages are referenced to VSS, VSSQ.
(3) Peak to peak AC noise on VREF may not exceed ±2% VREF(DC).
(4) VOH=1.95V, VOL=0.35V
(5) VOH=1.9V, VOL=0.4V
(6) The values of IOH(DC) is based on VDDQ=2.3V and VTT=1.19V.
The values of IOL(DC) is based on VDDQ=2.3V and VTT=1.11V.
(7) These parameters depend on the cycle rate and these values are measured at a cycle rate with the minimum values
of tCK and tRC.
(8) VTT is not applied directly to the device. VTT is a system supply for signal termination resistors, is expected to be set
equal to VREF and must track variations in the DC level of VREF.
Preliminary W942508AH
- 12 -
(9) These parameters depend on the output loading. Specified values are obtained with the output open.
(10) Transition times are measured between VIH min(AC) and VIL max(AC).Transition (rise and fall) of input signals have a
fixed slope.
(11) IF the result of nominal calculation with regard to tCK contains more than one decimal place, the result is rounded up to
the nearest decimal place.
(i.e., tDQSS=0.75×tCK, tCK=7.5ns, 0.75×7.5ns=5.625 ns is rounded up to 5.6 ns.)
(12) VX is the differential clock cross point voltage where input timing measurement is referenced.
(13) VID is magnitude of the difference between CLK input level and CLK input level.
(14) VISO means {VICK(CLK)+VICK(CLK )}/2.
(15) Refer to the figure below.
CLK
CLK
VSS
V
ICK
V
X
V
X
V
X
V
X
V
X
V
ICK
V
ICK
V
ICK
V
ID(AC)
V
ID(AC)
0 V Differential
V
ISO
V
ISO(min)
V
ISO(max)
V
SS
(16) tAC and tDQSCK depend on the clock jitter. These timing are measured at stable clock.
Preliminary W942508AH
Publication Release Date:August 6, 2001
- 13 - Revision A1
14. OPERATION MODE
The following table shows the operation commands.
Simplified Truth Tabl
SYM.
COMMAND
DEVICE
STATE
CKEN-1
CKEN
DM(4)
BS0
,
BS1
A10
A12,
A11,
A9-A0
CS
RAS
CAS
WE
ACT Bank Active Idle(3) H X X V V V L
L H H
PRE Bank Precharge Any(3) H X X V L X L
L H L
PREA Precharge All Any H X X X H X L
L H L
WRIT Write Active(3) H X X V L V L
H L L
WRITA
Write with Auto
Precharge Active(3) H X X V H V L
H L L
READ Read Active(3) H X X V L V L
H L H
READA
Read with Auto
Precharge Active(3) H X X V H V L
H L H
MRS Mode Register Set
Idle H X X L,L
C C L
L L L
EMRS Extended Mode
Regiser Set Idle H X X H,L
V V L
L L L
NOP No Operation Any H X X X X X L
H H H
BST Burst Read Stop Active H X X X X X L
H H L
DSL Device Deselect Any H X X X X X H
X X X
AREF Auto Refresh Idle H H X X X X L
L L H
SELF Self Refresh Entry
Idle H L X X X X L
L L H
H
X X X
SELEX
Self Refresh Exit Idle (Self
Refresh) L H X X X X
L
H H X
H
X X X PD Power Down Mode
Entry Idle/Active(5) H L X X X X
L
H H X
H
X X X
PDEX Power Down Mode
Exit Any (Power
Down) L H X X X X
L
H H X
WDE Data Write Enable
Active H X L X X X X
X X X
WDD Data Write Disable
Active H X H X X X X
X X X
Notes:
1. V = Valid X = Don’t Care L = Low level H = High level
2. CKEn signal is input level when commands are issued.
CKEn-1 signal is input level one clock cycle before the commands are issued.
3. These are state designated by the BS0, BS1 signals.
4. LDM, UDM (W942516AH)
5. Power Down Mode can not entry in the burst cycle.
Preliminary W942508AH
- 14 -
Function Truth Table
(Note 1)
CURRENT
STATE CS
RAS
CAS
WE
ADDRESS
COMMAND ACTION NOTES
H
X
X X
X DSL Nop
L H
H X
X NOP/BST Nop
L H
L H
BS, CA, A10
READ/READA
ILLEGAL 3
L H
L L
BS, CA, A10
WRIT/WRITA
ILLEGAL 3
L L
H H
BS, RA ACT Row activating
L L
H L
BS, A10 PRE/PREA Nop
L L
L H
X AREF/SELF Refresh or Self refresh 2
Idle
L L
L L
Op-Code MRS/EMRS Mode register accessing 2
H
X
X X
X DSL Nop
L H
H X
X NOP/BST Nop
L H
L H
BS, CA, A10
READ/READA
Begin read: Determine AP 4
L H
L L
BS, CA, A10
WRIT/WRITA
Begin write: Determine AP 4
L L
H H
BS, RA ACT ILLEGAL 3
L L
H L
BS, A10 PRE/PREA Precharge 5
L L
L H
X AREF/SELF ILLEGAL
Row Active
L L
L L
Op-Code MRS/EMRS ILLEGAL
H
X
X X
X DSL Continue burst to end
L H
H H
X NOP Continue burst to end
L H
H L
X BST Burst stop
L H
L H
BS, CA, A10
READ/READA
Term burst, new read: Determine AP 6
L H
L L
BS, CA, A10
WRIT/WRITA
ILLEGAL
L L
H H
BS, RA ACT ILLEGAL 3
L L
H L
BS, A10 PRE/PREA Term burst, precharging
L L
L H
X AREF/SELF ILLEGAL
Read
L L
L L
Op-Code MRS/EMRS ILLEGAL
H
X
X X
X DSL Continue burst to end
L H
H H
X NOP Continue burst to end
L H
H L
X BST ILLEGAL
L H
L H
BS, CA, A10
READ/READA
Term burst, start read: Determine AP 6, 7
L H
L L
BS, CA, A10
WRIT/WRITA
Term burst, start read: Determine AP 6
L L
H H
BS, RA ACT ILLEGAL 3
L L
H L
BS, A10 PRE/PREA Term burst. precharging 8
L L
L H
X AREF/SELF ILLEGAL
Write
L L
L L
Op-Code MRS/EMRS ILLEGAL
Preliminary W942508AH
Publication Release Date:August 6, 2001
- 15 - Revision A1
Function Truth Table, continued
CURRENT
STATE CS
RAS
CAS
WE
ADDRESS COMMAND ACTION NOTES
H
X
X
X
X
DSL
Continue burst to end
L
H
H
H
X
NOP
Continue burst to end
L
H
H
L
X
BST
ILLEGAL
L
H
L
H
BS, CA, A10
READ/READA
ILLEGAL
L
H
L
L
BS, CA, A10
WRIT/WRITA
ILLEGAL
3
L
L
H
H
BS, RA
ACT
ILLEGAL
3
L
L
H
L
BS, A10
PRE/PREA
ILLEGAL
L
L
L
H
X
AREF/SELF
ILLEGAL
Read with Auto
Prechange
L
L
L
L
Op-Code
MRS/EMRS
ILLEGAL
H
X
X
X
X
DSL
Continue burst to end
L
H
H
H
X
NOP
Continue burst to end
L
H
H
L
X
BST
ILLEGAL
L
H
L
H
BS, CA, A10
READ/READA
ILLEGAL
L
H
L
L
BS, CA, A10
WRIT/WRITA
ILLEGAL
L
L
H
H
BS, RA
ACT
ILLEGAL
3
L
L
H
L
BS, A10
PRE/PREA
ILLEGAL
3
L
L
L
H
X
AREF/SELF
ILLEGAL
Write with Auto
Precharge
L
L
L
L
Op-Code
MRS/EMRS
ILLEGAL
H
X X X X DSL Nop-> Idle after tRP
L
H
H
H
X
NOP
Nop-> Idle after t
RP
L
H
H
L
X
BST
ILLEGAL
L
H
L
H
BS, CA, A10
READ/READA
ILLEGAL
3
L
H
L
L
BS, CA, A10
WRIT/WRITA
ILLEGAL
3
L
L
H
H
BS, RA
ACT
ILLEGAL
3
L
L
H
L
BS, A10
PRE/PREA
Nop->Idle after t
RP
L
L
L
H
X
AREF/SELF
ILLEGAL
Precharging
L
L
L
L
Op-Code
MRS/EMRS
ILLEGAL
H
X
X
X
X
DSL
Nop-> Row active after
L
H
H
H
X
NOP
Nop-> Row active after
L
H
H
L
X
BST
ILLEGAL
L
H
L
H
BS, CA, A10
READ/READA
ILLEGAL
3
L
H
L
L
BS, CA, A10
WRIT/WRITA
ILLEGAL
3
L
L
H
H
BS, RA
ACT
ILLEGAL
3
L
L
H
L
BS, A10
PRE/PREA
ILLEGAL
3
L
L
L
H
X
AREF/SELF
ILLEGAL
Row Activating
L
L
L
L
Op-Code
MRS/EMRS
ILLEGAL
Preliminary W942508AH
- 16 -
Function Truth Table, continued
CURRENT
STATE
CS
RAS
CAS
WE
ADDRESS
COMMAND ACTION NOTES
H
X
X X
X DSL Nop->Row active after tWR
L
H
H
H
X
NOP
Nop->Row active after t
WR
L
H
H
L
X
BST
ILLEGAL
L
H
L
H
BS, CA, A10
READ/READA
ILLEGAL
3
L
H
L
L
BS, CA, A10
WRIT/WRITA
ILLEGAL
3
L
L
H
H
BS, RA
ACT
ILLEGAL
3
L
L
H
L
BS, A10
PRE/PREA
ILLEGAL
3
L
L
L
H
X
AREF/SELF
ILLEGAL
Write
Recovering
L
L
L
L
Op-Code
MRS/EMRS
ILLEGAL
H
X
X
X
X
DSL
Nop->Enter precharge after t
WR
L
H
H
H
X
NOP
Nop->Enter precharge after t
WR
L
H
H
L
X
BST
ILLEGAL
L
H
L
H
BS, CA, A10
READ/READA
ILLEGAL
3
L
H
L
L
BS, CA, A10
WRIT/WRITA
ILLEGAL
3
L
L
H
H
BS, RA
ACT
ILLEGAL
3
L
L
H
L
BS, A10
PRE/PREA
ILLEGAL
3
L
L
L
H
X
AREF/SELF
ILLEGAL
Write
Recovering
with Auto
Precharge
L
L
L
L
Op-Code
MRS/EMRS
ILLEGAL
H
X
X X
X DSL Nop->Idle after tRC
L
H
H
H
X
NOP
Nop->Idle after t
RC
L
H
H
L
X
BST
ILLEGAL
L
H
L
H
X
READ/WRIT
ILLEGAL
L
L
H
X
X
ACT/PRE/PREA
ILLEGAL
Refreshing
L
L
L
X
X
AREF/SELF/MRS/EM
ILLEGAL
H
X
X X
X DSL Nop->Row after tMRD
L
H
H
H
X
NOP
Nop->Row after t
MRD
L
H
H
L
X
BST
ILLEGAL
L
H
L
X
X
READ/WRIT
ILLEGAL
Mode
Register
Accessing
L
L
X X
X ACT/PRE/PREA/ARE
F/SELF/MRS/EMRS
ILLEGAL
Notes:
1. All entries assume that CKE was active (High level) during the preceding clock cycle and the current clock cycle.
2. Illegal if any bank is not idle.
3. Illegal to bank in specified states; Function may be legal in the bank indicated by Bank Address (BS), depending on the
state of that bank.
4. Illegal if tRCD is not satisfied.
5. Illegal if tRAS is not satisfied.
6. Must satisfy burst interrupt condition.
7. Must avoid bus contention, bus turn around, and/or satisfy write recovery requirements.
8. Must mask preceding data which don’t satisfy t WR
Remark: H = High level, L = Low level, X = High or Low level (Don’t care), V = Valid data
Preliminary W942508AH
Publication Release Date:August 6, 2001
- 17 - Revision A1
Function Truth Table for CKE
CKE
CURRENT
STATE n-1
n
CS
RAS
CAS
WE
ADDRESS
ACTION NOTES
H
X
X
X
X X
X INVALID
L
H
H
X
X X
X Exit Self Refresh->Idle after tXSNR
L
H
L
H
H X
X Exit Self Refresh->Idle after tXSNR
L
H
L
H
L X
X ILLEGAL
L
H
L
L
X X
X ILLEGAL
Self Refresh
L
L
X
X
X X
X Maintain Self Refresh
H
X
X
X
X X
X INVALID
L
H
X
X
X X
X Exit Power down->Idle after tIS
Power Down
L
L
X
X
X X
X Maintain power down mode
H
H
X
X
X X
X Refer to Function Truth Table
H
L
H
X
X X
X Enter Power down 2
H
L
L
H
H X
X Enter Power down 2
H
L
L
L
L H
X Self Refresh 1
H
L
L
H
L X
X ILLEGAL
H
L
L
L
X X
X ILLEGAL
All Banks Idle
L
X
X
X
X X
X Power down 2
H
H
X
X
X X
X Refer to Function Truth Table
H
L
H
X
X X
X Enter Power down 2
H
L
L
H
H X
X Enter Power down 2
H
L
L
L
L H
X ILLEGAL
H
L
L
H
L X
X ILLEGAL
H
L
L
L
X X
X ILLEGAL
Row Active
L
X
X
X
X X
X Power down
Any State Other
Than Listed
Above
H
H
X
X
X X
X Refer to Function Truth Table
Notes:
1. Self refresh can enter only from the all banks idle state.
2. Power down can enter only from bank idle or row active state.
Remark: H = High level, L = Low level, X = High or Low level (Don’t care), V = Valid data
Preliminary W942508AH
- 18 -
15. SIMPLIFIED STATE DIAGRAM
POWER
APPLIED
Automatic Sequence
Command Sequence
Read A
Write Read
ROW
ACTIVE
POWER
DOWN
IDLE
MODE
REGISTER
SET
AUTO
REFRESH
SELF
REFRESH
Read
Read A
Write
Write A
PRE
CHARGE
POWER
ON
MRS/EMRS AREF
SREF
SREFX
PD
PDEX
ACT
BST
Read
Write
Write A Write A Read A
PRE
PRE
PRE
PRE
ACTIVE
POWERDOWN
PD
PDEX
Read
Read A
Preliminary W942508AH
Publication Release Date:August 6, 2001
- 19 - Revision A1
16. FUNCTIONAL DESCRIPTION
Power Up Sequence
(1) Apply power and attempt to CKE at a low state (
≤
0.2V), all other inputs may be undefined
1) Apply VDD before or at the same time as VDDQ.
2) Apply VDDQ before or at the same time as VTT and VREF.
(2) Start Clock and maintain stable condition for 200µS (min).
(3) After stable power and clock, apply NOP and take CKE high.
(4) Issue EMRS (Extended Mode Register Set) to enable DLL and establish Output Driver Type.
(5) Issue MRS (Mode Register Set) to reset DLL and set device to idle with bit A8.
(an additional 200 cycles(min) of clock are required for DLL Lock)
(6) Issue precharge command for all banks of the device.
(7) Issue two or more Auto Refresh commands.
(8) Issue MRS-Initialize device operation.
(If device operation mode is set at sequence 5, sequence 8 can be skipped.)
Command Function
1. Bank Activate Command
(RAS = "L", CAS = "H",
WE
= "H", BS0, BS1 = Bank, A0 to A12 = Row Address)
The Bank Activate command activates the bank designated by the BS (Bank address) signal.
Row addresses are latched on A0 to A12 when this command is issued and the cell data is read
out of the sense amplifiers. The maximum time that each bank can be held in the active state is
specified as tRAS (max). After this command is issued, Read or Write operation can be executed.
2. Bank Precharge Command
(RAS = "L", CAS = "H",
WE
= "L", BS0, BS1 = Bank, A10 = "L", A0 to A9, A11, A12 = Don’t
care)
The Bank Precharge command percharges the bank designated by BS. The precharged bank is
switched from the active state to the idle state.
3. Precharge All Command
(RAS = "L", CAS = "H",
WE
= "L", BS0, BS1 = Don’t care, A10 = "H", A0 to A9, A11, A12 =
Don’t care)
The Precharge All command precharges all banks simultaneously. Then all banks are switched to
the idle state.
4. Write Command
(RAS = "H", CAS = "L",
WE
= "L", BS0, BS1 = Bank, A10 = "L", A0 to A9, A11 = Column
Address)
Preliminary W942508AH
- 20 -
The write command performs a Write operation to the bank designated by BS. The write data are
latched at both edges of DQS. The length of the write data (Burst Length) and column access
sequence (Addressing Mode) must be in the Mode Register at power-up prior to the Write
operation.
5. Write with Auto Precharge Command
(RAS ="H", CAS = "L",
WE
= "L", BS0, BS1 = Bank, A10= "H", A0 to A9, A11 = Column
Address)
The Write with Auto Precharge command performs the Precharge operation automatically after
the Write operation. This command must not be interrupted by any other commands.
6. Read Command
(RAS ="H", CAS = "L",
WE
= "H", BS0, BS1 = Bank, A10 = "L", A0 to A9, A11 = Column
Address)
The Read command performs a Read operation to the bank designated by BS. The read data are
synchronized with both edges of DQS. The length of read data (Burst Length), Addressing Mode
and CAS Latency (access time from CAS command in a clock cycle) must be programmed in
the Mode Register at power-up prior to the Read operation.
7. Read with Auto Precharge Command
(RAS = "H", CAS = "L",
WE
= "H", BS0, BS1 = Bank, A10 = "H", A0 to A9, A11 = Column
Address)
The Read with Auto precharge command automatically performs the Precharge operation after
the Read operation.
1) READA
≥
tRAS (min) - (BL/2) x tCK
Internal precharge operation begins after BL/2 cycle from Read with Auto Precharge
command.
2) tRCD(min)
≤
READA < tRAS(min) - (BL/2) x tCK
Data can be read with shortest latency, but the internal Precharge operation does not begin
until after tRAS (min) has completed.
This command must not be interrupted by any other command.
8. Mode Register Set Command
(RAS = "L", CAS = "L",
WE
= "L", BS0 = "L", BS1 = "L", A0 to A12 = Register Data)
The Mode Register Set command programs the values of CAS latency, Addressing Mode, Burst
Length and DLL reset in the Mode Register. The default values in the Mode Register after power-
up are undefined, therefore this command must be issued during the power-up sequence. Also,
this command can be issued while all banks are in the idle state. Refer to the table for specific
codes.
Preliminary W942508AH
Publication Release Date:August 6, 2001
- 21 - Revision A1
9. Extended Mode Register Set Command
(RAS = "L", CAS = "L",
WE
= "L", BS0 = "H", BS1 = "L", A0 to A12 = Register data)
The Extended Mode Register Set command can be implemented as needed for function
extensions to the standard (SDR-SDRAM). Currently the only available mode in EMRS is DLL
enable/disable, decoded by A0. The default value of the extended mode register is not defined;
therefore this command must be issued during the power-up sequence for enabling DLL. Refer to
the table for specific codes.
10. No-Operation Command
(RAS = "H", CAS = "H",
WE
= "H")
The No-Operation command simply performs no operation (same command as Device Deselect).
11. Burst Read Stop Command
(RAS = "H", CAS = "H",
WE
= "L")
The Burst stop command is used to stop the burst operation. This command is only valid during a
Burst Read operation.
12. Device Deselect Command
(CS="H")
The Device Deselect command disables the command decoder so that the RAS ,CAS,
WE
and
Address inputs are ignored. This command is similar to the No-Operation command.
13. Auto Refresh Command
(RAS = "L", CAS = "L",
WE
= "H", CKE = "L", BS0, BS1, A0 to A12 = Don’t care)
The Auto Refresh command is used to refresh the row address provided by the internal refresh
counter. The Refresh operation must be performed 8192 times within 64ms. The next command
can be issued after tREF from the end of the Auto Refresh command. When the Auto Refresh
command is used, all banks must be in the idle state.
14. Self Refresh Entry Command
(RAS = "L", CAS = "L",
WE
= "H", CKE = "L", BS0, BS1, A0 to A12 = don’t care)
The Self Refresh Entry command is used to enter Self Refresh mode. While the device is in Self
Refresh mode, all input and output buffer (except the CKE buffer) are disabled and the Refresh
operation is automatically performed. Self Refresh mode is exited by taking CKE "high" (the Self
Refresh Exit command). During self refresh, DLLl is disable.
15. Self Refresh Exit Command
(CKE = "H", CS = "H" or CKE = "H", RAS = "H", CAS = "H")
Preliminary W942508AH
- 22 -
This command is used to exit from Self Refresh mode. Any subsequent commands can be issued
after tXSNR (tXSRD for Read Command) from the end of this command.
16. Data Write Enable /Disable Command
(DM = "L/H" or LDM, UDM = "L/H")
During a Write cycle, the DM or LDM, UDM signal functions as Data Mask and can control every
word of the input data. The LDM signal controls DQ0 to DQ7 and UDM signal controls DQ8 to
DQ15.
Read Operation
Issuing the Bank Activate command to the idle bank puts it into the active state. When the Read
command is issued after tRCD from the Bank Activate command, the data is read out sequentially,
synchronized with both edges of DQS (Burst Read operation). The initial read data becomes available
after CAS latency from the issuing of the Read command. TheCASlatency must be set in the Mode
Register at power-up.
When the Precharge Operation is performed on a bank during a Burst Read and operation, the Burst
operation is terminated.
When the Read with Auto Precharge command is issued, the Precharge operation is performed
automatically after the Read cycle, then the bank is switched to the idle state. This command cannot
be interrupted by any other commands. Refer to the diagrams for Read operation.
Write Operation
Issuing the Write command after tRCD from the bank activate command. The input data is latched
sequentially, synchronizing with both edges(rising &falling) of DQS after the Write command (Burst
write operation). The burst length of the Write data (Burst Length) and Addressing Mode must be set
in the Mode Register at power-up.
When the Precharge operation is performed in a bank during a Burst Write operation, the Burst
operation is terminated.
When the Write with Auto Precharge command is issued, the Precharge operation is performed
automatically after the Write cycle, then the bank is switched to the idle state, The Write with Auto
Precharge command cannot be interrupted by any other command for the entire burst data duration.
Refer to the diagrams for Write operation.
Precharge
There are two Commands, which perform the precharge operation (Bank Precharge and Precharge
All). When the Bank Precharge command is issued to the active bank, the bank is precharged and
then switched to the idle state. The Bank Precharge command can precharge one bank independently
of the other bank and hold the unprecharged bank in the active state. The maximum time each bank
can be held in the active state is specified as tRAS (max). Therefore, each bank must be precharged
within tRAS(max) from the bank activate command.
The Precharge All command can be used to precharge all banks simultaneously. Even if banks are
not in the active state, the Precharge All command can still be issued. In this case, the Precharge
operation is performed only for the active bank and the precharge bank is then switched to the idle
state.
Preliminary W942508AH
Publication Release Date:August 6, 2001
- 23 - Revision A1
Burst Termination
When the Precharge command is used for a bank in a Burst cycle, the Burst operation is terminated.
When Burst Read cycle is interrupted by the Precharge command, read operation is disabled after
clock cycle of (CAS latency) from the Precharge command. When the Burst Write cycle is interrupted
by the Precharge command . the input circuit is reset at the same clock cycle at which the precharge
command is issued. In this case, the DM signal must be asserted "high": during tWR to prevent writing
the invalided data to the cell array.
When the Burst Read Stop command is issued for the bank in a Burst Read cycle, the Burst Read
operation is terminated. The Burst read Stop command is not supported during a write burst operation.
Refer to the diagrams for Burst termination.
Refresh Operation
Two types of Refresh operation can be performed on the device: Auto Refresh and Self Refresh. By
repeating the Auto Refresh cycle, each bank in turn refreshed automatically. The Refresh operation
must be performed 8192 times(rows) within 64 mS. The period between the Auto Refresh command
and the next command is specified by tRFC.
Self Refresh mode enter issuing the Self Refresh command (CKE asserted "low"). while all banks are
in the idle state. The device is in Self Refresh mode for as long as cke held "low". In the case of 8192
burst Auto Refresh commands, 8192 burst Auto Refresh commands must be performed within 7.8 µS
before entering and after exiting the Self Refresh mode. In the case of distributed Auto Refresh
commands, distributed auto refresh commands must be issued every 7.8 µS and the last distributed
Auto Refresh commands must be performed within 7.8 µS before entering the self refresh mode. After
exiting from the Self Refresh mode, the refresh operation must be performed within 7.8 µS. In Self
Refresh mode, all input/output buffers are disable, resulting in lower power dissipation (except CKE
buffer). Refer to the diagrams for Refresh operation.
Power Down Mode
Two types of Power Down Mode can be performed on the device: Active Standby Power Down Mode
and Precharge Standby Power Down Mode.
When the device enters the Power Down Mode, all input/output buffers and DLL are disabled resulting
in low power dissipation (except CKE buffer).
Power Down Mode enter asserting CKE "low" while the device is not running a burst cycle. Taking
CKE: "high" can exit this mode. When CKE goes high, a No operation command must be input at next
CLK rising edge. Refer to the diagrams for Power Down Mode.
Mode Register Operation
The mode register is programmed by the Mode Register Set command (MRS/EMRS) when all banks
are in the idle state. The data to be set in the Mode Register is transferred using the A0 to A12 and
BS0, BS1 address inputs.
The Mode Register designates the operation mode for the read or write cycle. The register is divided
into five filed: (1) Burst Length field to set the length of burst data (2) Addressing Mode selected bit to
designate the column access sequence in a Burst cycle (3) CAS Latency field to set the assess time
in clock cycle (4) DLL reset field to reset the dll (5) Regular/Extended Mode Register filed to select a
Preliminary W942508AH
- 24 -
type of MRS (Regular/Extended MRS). EMRS cycle can be implemented the extended function (DLL
enable/Disable mode)
The initial value of the Mode Register (including EMRS) after power up is undefined; therefore the
Mode Register Set command must be issued before power operation.
(1) Burst Length field (A2 to A0)
This field specifies the data length for column access using the A2 to A0 pins and sets the Burst
Length to be 2, 4, and 8 words.
A2
A1
A0
BURST LENGTH
0 0 0 Reserved
0 0 1 2 words
0 1 0 4 words
0 1 1 8 words
1 x x Reserved
(2) Addressing Mode Select (A3)
The Addressing Mode can be one of two modes; Interleave mode or Sequential Mode, When
the A3 bit is "0", Sequential mode is selected. When the A3 bit is "1", Interleave mode is
selected. Both addressing Mode support burst length 2, 4, and 8 words.
A3
ADDRESSING MODE
0 Sequential
0 Interleave
Preliminary W942508AH
Publication Release Date:August 6, 2001
- 25 - Revision A1
• Address sequence of Sequential mode
A column access is performed by incrementing the column address input to the device. The
address is varied by the Burst Length as the following.
Addressing Sequence of Sequential Mode
DATA ACCESS ADDRESS
BURST LENGTH
Data 0 n 2 words (address bits is A0)
Data 1 n + 1 not carried from A0 to A1
Data 2 n + 2 4 words (address bit A0, A1)
Data 3 n + 3 Not carried from A1 to A2
Data 4 n + 4
Data 5 n + 5 8 words (address bits A2, A1 and A0)
Data 6 n + 6 Not carried from A2 to A3
Data 7 n + 7
• Addressing sequence of Interleave mode
A Column access is started from the inputted column address and is performed by
interleaving the address bits in the sequence shown as the following.
Address Sequence for Interleave Mode
DATA ACCESS ADDRESS BURST LENGTH
Data 0 A8 A7 A6 A5 A4 A3 A2 A1 A0 2 words
Data 1 A8 A7 A6 A5 A4 A3 A2 A1
A0
Data 2 A8 A7 A6 A5 A4 A3 A2
A1
A0 4 words
Data 3 A8 A7 A6 A5 A4 A3 A2
A1
A0
Data 4 A8 A7 A6 A5 A4 A3
A2
A1 A0 8 words
Data 5 A8 A7 A6 A5 A4 A3
A2
A1
A0
Data 6 A8 A7 A6 A5 A4 A3
A2
A1
A0
Data 7 A8 A7 A6 A5 A4 A3
A2
A1
A0
Preliminary W942508AH
- 26 -
(3) CAS Latency field (A6 to A4)
This field specifies the number of clock cycles from the assertion of the Read command to the
first data read. The minimum values of CAS Latency depends on the frequency of CLK.
A6
A5
A4
CAS LATENCY
0 0 0 Reserved
0 0 1 Reserved
0 1 0 2
0 1 1 Reserved
1 0 0 Reserved
1 0 1 Reserved
1 1 0 2.5
1 1 1 Reserved
(4) DLL Reset bit (A8)
This bit is used to reset DLL. When the A8 bit is "1", DLL is reset.
(5) Mode Register /Extended Mode register change bits (BS0, BS1)
These bits are used to select MRS/EMRS.
BS1
BS0
A12-A0
0 0 Regular MRS Cycle
0 1 Extended MRS Cycle
1 x Reserved
(6) Extended Mode Register field
1) DLL Switch field (A0)
This bit is used to select DLL enable or disable
A0
DLL
0 Enable
1 Disable
2) Output Driver Size Control field (A1)
This bit is used to select Output Driver Size, both Full strength and Half strength are based on
JEDEC standard.
A1
OUTPUT DRIVER
0 Full Strength
1 Half Strength
(7) Reserved field
• Test mode entry bit (A7)
This bit is used to enter Test mode and must be set to "0" for normal operation.
• Reserved bits (A9, A10, A11, A12)
These bits are reserved for future operations. They must be set to "0" for normal operation.
Preliminary W942508AH
Publication Release Date:August 6, 2001
- 27 - Revision A1
17. TIMING WAVEFORMS
Command Input Timing
CLK
CLK
t
CK
t
CK
t
CL
t
CH
t
IS
t
IH
t
IS
t
IH
t
IS
t
IH
t
IS
t
IH
t
IS
t
IH
CS
RAS
CAS
WE
A0~A12
BS0, 1
Refer to the Command Truth Table
Timing of the CLK Signals
tCK tTtT
VIH
VIH(AC)
VIL(AC)
VIL
CLK
CLK
CLK
CLK
VXVXVX
VIH
VIL
t
CH
t
CL
Preliminary W942508AH
- 28 -
Timing Waveforms, continued
Read Timing (Burst Length = 4)
tIS tIH
DA0 DA1 DA2
tCH tCL tCK
ADD
CMD
CLK
CLK
READ
Col
QA0 QA1 QA2 DA3
QA3
tRPRE tDQSCK
tDQSCK tDQSCK
tRPST
PostamblePreamble
Hi-Z
Hi-Z
tDQSQ tDQSQ tDQSQ
tQH
tQH
tAC
tLZ
tHZ
Hi-Z
Hi-Z
DA0 DA1 DA2
QA0 QA1 QA2 DA3
QA3
tRPE tDQSCK
tDQSCK tDQSCK
tRPST
PostamblePreamble
Hi-Z
Hi-Z
tDQSQ tDQSQ tDQSQ
tQH
tQH
tAC
tLZ tHZ
Hi-Z
Hi-Z
CAS
DQS
Output
(Data)
latency=2
CAS
DQS
Output
(Data)
latency=2.5
Note: The correspondence of LDQS, UDQS to DQ. ( W942516AH)
LDQS DQ0~7
DQ8~15UDQS
tIS tIH
Preliminary W942508AH
Publication Release Date:August 6, 2001
- 29 - Revision A1
Timing Waveforms, continued
Write Timing (Burst Length = 4)
tIS tIH tDSH tDSS tDSStDSH
tWPRES
tDH
tDH
tDH
tDS tDS tDS
tDQSS tDSH tDSHtDSS tDSS
Postamble
tWPRE
Preamble
tDQSH tDQSHtDQSL tWPST
DA0 DA1 DA2 DA3
tWPRES
tDH
tDH
tDH
tDS tDS tDS
tDQSS
tDSH tDSHtDSS tDSS
Postamble
tWPRE
Preamble
tDQSH tDQSH
tDQSL tWPST
DA0 DA1 DA2 DA3
tWPRES
tDH
tDS tDS
tDQSS tDSH
Postamble
tWPRE
Preamble
tDQSH tDQSHtDQSL tWPST
DA0 DA1 DA2 DA3
tDSSKtDSSKtDSSK
tDSSK
tDS
tDH tDH
tCH tCL tCK
DQS
Input
(Data)
LDQS
DQ0~7
UDQS
DQ8~15
x4, x8 device
x16 device
ADD
CMD
CLK
CLK
WRIT
Col
DA0 DA1 DA2 DA3
DA3DA2DA1DA0
DA0 DA1 DA2 DA3
Note: x16 has 2DQS’s (UDQS for uper byte and LDQS for lower byte). Even if one of the 2 bytes is not used, both UDQS and
LDQS must be toggled.
Preliminary W942508AH
- 30 -
Timing Waveforms, continued
DM, DATA MASK (W942508AH/W942504AH)
WRIT
t
DIPW
t
DIPW
t
DH
t
DH
t
DS
t
DS
Masked
/CLK
CLK
CMD
DQS
DM
DQ D3D1D0
DM, DATA MASK (W942516AH)
WRIT
t
DIPW
t
DIPW
t
DH
t
DH
t
DS
t
DS
Masked
/CLK
CLK
CMD
LDQS
LDM
DQ0~
DQ7 D3D1D0
t
DIPW
t
DIPW
t
DH
t
DH
t
DS
t
DS
Masked
UDQS
UDM
DQ8~
DQ15 D3
D2
D0
Preliminary W942508AH
Publication Release Date:August 6, 2001
- 31 - Revision A1
Timing Waveforms, continued
Mode Register Set (MRS) Timing
MRS
Register Set data
NEXT CMD
tMRD
CLK
CLK
CMD
ADD
A2 A1 A0
A3
A6 A5 A4
A8
BS1 BS0
000
000
001
010
011
100
101
110
111
001
010
011
100
101
110
111
0
1
0
1
1
1
0
0
0
1
0
1
2
4
8
2
4
8
Burst Length
Sequential Interleaved
Reserved Reserved
Reserved
Reserved
Reserved
Reserved
Sequential
Interleaved
Addressing Mode
CAS Latency
2
DLL Reset
No
Yes
MRS or EMRS
Regular MRS cycle
Extended MRS cycle
2.5
A0
A1
A2
A3
A4
A5
A6
A7
A8
A9
A10
A11
A12
BS0
BS1 "0"
"0"
"0"
"0"
"0"
"0"
"0"
DLL Reset
Reserved
Addressing Mode
* "Reserved" should stay "0" during
MRS cycle.
Reserved
Mode Register Set or
Extended Mode Register
Set
CAS Latency
Burst Length
Reserved Reserved
Preliminary W942508AH
- 32 -
Timing Waveforms, continued
Extend Mode Register Set (EMRS) Timing
EMRS
Register Set data
NEXT CMD
tMRD
CLK
CLK
CMD
ADD
A0
A1
BS1 BS0
0
1
0
1
1
1
0
0
0
1
0
1
Enable
Disable
DLL Switch
Output Driver Size
Full Strength
Hall Strength
MRS or EMRS
Regular MRS cycle
Extended MRS cycle
A0
A1
A2
A3
A4
A5
A6
A7
A8
A9
A10
A11
A12
BS0
BS1 "0"
"0"
"0"
"0"
"0"
"0"
"0"
* "Reserved" should stay "0" during
EMRS cycle.
"0"
"0"
"0"
"0"
"0"
"0"
Output Driver
DLL Switch
Reserved
Mode Register Set or
Extended Mode Register
Set
Preliminary W942508AH
Publication Release Date:August 6, 2001
- 33 - Revision A1
Timing Waveforms, continued
Auto Precharge Timing (Read cycle, CL = 2)
1) tRCD (READA) ≥ tRAS (min) – (BL/2) × tCK
AP
Q7Q6Q5Q4Q3Q2Q1Q0
ACT
READA
ACT
Q0 Q1 Q2 Q3
ACTREADAACT
Q0 Q1
ACT
AP
READAACT
tRP
t
RAS
CMD
DQS
DQ
CMD
DQS
DQ
CMD
DQS
DQ
BL=2
BL=4
BL=8
CLK
CLK
AP
Notes: CL2 shown; same command operation timing with CL=2.5
In this case , the internal precharge operation begin after BL/2 cycle from READA command.
AP represents the start of internal precharging .
The Read with Auto precharge command cannot be interrupted by any other command.
Preliminary W942508AH
- 34 -
Timing Waveforms, continued
2) tRCD/RAP(min) ≤ tRCD (READA) < tRAS (min) – (BL/2) × tCK
AP
Q7Q6Q5Q4Q3Q2Q1Q0
ACT READA ACT
Q0 Q1 Q2 Q3
ACTREADAACT
Q0 Q1
ACT
AP
READAACT
t
RP
t
RAS
CMD
DQS
DQ
CMD
DQS
DQ
CMD
DQS
DQ
BL=2
BL=4
BL=8
CLK
CLK
AP
t
RAP
t
RCD
t
RAP
t
RCD
t
RAP
t
RCD
Notes: CL2 shown; same command operation timing with CL=2.5
In this case , the internal precharge operation does not begin until after tRAS (min) has command.
AP represents the start of internal precharging .
The Read with Auto Precharge command cannot be interrupted by any other command.
Preliminary W942508AH
Publication Release Date:August 6, 2001
- 35 - Revision A1
Timing Waveforms, continued
Auto Precharge Timing (Write Cycle)
AP
WRITA ACT
ACTWRITA
ACTWRITA
CMD
DQS
DQ
CMD
DQS
DQ
CMD
DQS
DQ
BL=2
BL=4
BL=8
CLK
CLK
AP
AP
D0 D1
D0 D1 D2 D3
D0 D1 D2 D3 D4 D5 D6 D7
t
DAL
t
DAL
t
DAL
The Write with Auto Precharge command cannot be interrupted by any other command.
AP represents the start of internal precharging .
Preliminary W942508AH
- 36 -
Timing Waveforms, continued
Read Interrupted by Read (CL = 2, BL = 2, 4, 8)
CMD
ADD
DQS
CLK
CLK
DQ
ACT READ A READ B READ C READ D READ E
Row
Address COl,Add,A Col,Add,B Col,Add,C Col,Add,D Col,Add,E
QC0QA0 QA1 QB0 QB1
t
CCD
t
CCD
t
CCD
t
CCD
t
RCD
Burst Read Stop (BL = 8)
READ
CMD
DQS
DQ
CLK
CLK
BST
Q0 Q1 Q2 Q3 Q4 Q5
Q0 Q1 Q2 Q3 Q4 Q5
CAS Latency
CAS Latency
CAS Latency=2
DQS
DQ
CAS Latency=2.5
Preliminary W942508AH
Publication Release Date:August 6, 2001
- 37 - Revision A1
Timing Waveforms, continued
Read Interrupted by Write & BST (BL = 8)
READ
CMD
DQS
DQ
CLK
CLK
BST
Q0 Q1 Q2 Q3 Q4 Q5
CAS Latency=2
WRIT
D0 D1 D2 D3 D4 D5 D6 D7
READ
CMD
DQS
DQ
BST
Q0 Q1 Q2 Q3 Q4 Q5
CAS Latency=2.5
WRIT
D0 D1 D2 D3 D4 D5 D6 D7
Burst Read cycle must be terminated by BST Command to avoid I/O conflict.
Read Interrupted by Precharge (BL = 8)
READ
CMD
DQS
DQ
CLK
CLK
PRE
Q0 Q1 Q2 Q3 Q4 Q5
Q0 Q1 Q2 Q3 Q4 Q5
CAS Latency
CAS Latency
CAS Latency=2
DQS
DQ
CAS Latency=2.5
Preliminary W942508AH
- 38 -
Timing Waveforms, continued
Write Interrupted by Write (BL = 2, 4, 8)
CMD
ADD
DQS
CLK
CLK
DQ
ACT WRIT A WRIT B WRIT C WRIT D WRIT E
Row
Address COl. Add. A Col.Add.B Col. Add. C Col. Add. D Col. Add. E
DC0 DC1 DD0 DD1DA0 DA1 DB0 DB1
t
CCD
t
CCD
t
CCD
t
CCD
t
RCD
Write Interrupted by Read (CL = 2, BL = 8)
WRIT
CMD
DQS
DM
CLK
CLK
t
WTR
DQ D4 D5 D6 D7D0 D1 D2 D3
Data must be
masked by DM
READ
Data masked by READ
command, DQS input ignored.
Q4 Q5 Q6 Q7Q0 Q1 Q2 Q3
Preliminary W942508AH
Publication Release Date:August 6, 2001
- 39 - Revision A1
Timing Waveforms, continued
Write Interrupted by Read (CL = 2.5, BL = 4)
WRIT
CMD
DQS
DM
CLK
CLK
READ
t
WTR
DQ Q0 Q1 Q2 Q3D0 D1 D2 D3
Data must be masked by DM
Write Interrupted by Precharge (BL = 8)
WRIT
CMD
DQS
DM
CLK
CLK
ACT
tWR
DQ D4 D5 D6 D7D0 D1 D2 D3
Data must be
masked by DM
PRE
tRP
Data masked by PRE
command, DQS input ignored.
Preliminary W942508AH
- 40 -
Timing Waveforms, continued
2 Bank Interleave Read Operation (CL = 2, BL = 2)
∗tCK = 100 MHz
CMD
DQS
CLK
CLK
DQ
Q0a Q1a Q0b Q1b
ACTa/b : Bank Act. CMD of bank a/b
READAa/b : Read with Auto Pre.CMD of bank a/b
APa/b : Auto Pre. of bank a/b
ACTa ACTb READAa ACTaREADAb ACTb
APa APb
t
RCD(a)
t
RAS(a)
t
RP(a)
t
RAS(b)
t
RCD(b)
t
RP(b)
CL(a) CL(b)
Preamble Postamble Preamble Postamble
t
RRD
t
RC(a)
t
RC(b)
t
RRD
2 Bank Interleave Read Operation (CL = 2, BL = 4)
CMD
DQS
CLK
CLK
DQ
Q2a Q3a Q2b Q3b
ACTa/b : Bank Act. CMD of bank a/b
READAa/b : Read with Auto Pre.CMD of bank a/b
APa/b : Auto Pre. of bank a/b
ACTa READAaACTb READAb ACTa ACTb
APa APb
t
RCD(a)
t
RAS(a)
t
RP(a)
t
RAS(b)
t
RCD(b)
t
RP(b)
CL(a) CL(b)
Preamble Postamble
t
RRD
t
RC(a)
t
RC(b)
t
RRD
Q0a Q1a Q0b Q1b
Preliminary W942508AH
Publication Release Date:August 6, 2001
- 41 - Revision A1
Timing Waveforms, continued
4 Bank Interleave Read Operation (CL = 2, BL = 2)
CMD
DQS
CLK
CLK
DQ
Q0a Q1a Q0b Q1b
ACTa/b/c/d : Bank Act. CMD of bank a/b/c/d
READAa/b/c/d : Read with Auto Pre.CMD of bank a/b/c/d
APa/b/c/d : Auto Pre. of bank a/b/c/d
ACTa ACTb READAaACTc READAbACTd READAcACTa
APa APb
t
RCD(a)
t
RAS(a)
t
RP
t
RAS(b)
t
RCD(b)
CL(a) CL(b)
Preamble Postamble Preamble
t
RRD
t
RC(a)
t
RRD
t
RAS(c)
t
RAS(d)
t
RCD(d)
t
RCD(c)
t
RRD
t
RRD
4 Bank Interleave Read Operation (CL = 2, BL = 4)
CMD
DQS
CLK
CLK
DQ
ACTa/b/c/d : Bank Act. CMD of bank a/b/c/d
READAa/b/c/d : Read with Auto Pre.CMD of bank a/b/c/d
APa/b/c/d : Auto Pre. of bank a/b/c/d
ACTa READAaACTb READAbACTc READAcACTd READAdACTa
APa APb
t
RCD(a)
t
RAS(a)
t
RP(a)
t
RAS(b)
t
RCD(b)
CL(a) CL(b)
t
RRD
t
RC(a)
t
RRD
t
RAS(c)
t
RAS(d)
t
RCD(d)
t
RCD(c)
t
RRD
t
RRD
Q2a Q3a Q2b Q3b
CL(c)
Preamble
Q0a Q1a Q0b Q1bQ0a Q1a
CL(b)CL(b)
APc
Preliminary W942508AH
- 42 -
Timing Waveforms, continued
Auto Refresh Cycle
CMD
CLK
CLK
PREA AREF AREF CMDNOP NOP NOP
tRP tRFC tRFC
CKE has to be kept "High" level for Auto-Refresh cycle.
Active Power Down Mode Entry and Exit Timing
CMD
CLK
CLK
NOP CMDNOP
ExitEntry
NOP NOP
tIH tIS tCK tIH tIS
CKE
Precharged Power Down Mode Entry and Exit Timing
CMD
CLK
CLK
NOP CMDNOP
ExitEntry
NOP NOP
tIH tIS tCK tIH tIS
CKE
Preliminary W942508AH
Publication Release Date:August 6, 2001
- 43 - Revision A1
Timing Waveforms, continued
Self Refresh Entry and Exit Timing
CMD
CLK
CLK
t
IH
t
IS
t
CK
t
IH
t
IS
SELF CMDSELFX NOPNOPPREA
ExitEntry
CKE
t
RP
t
XSRD
NOPSELF
t
XSRD
SELFX NOP ACT READ NOP
Exit
Entry
Preliminary W942508AH
- 44 -
18. PACKAGE DIMENSION
TSOP 66l – 400 mil
Preliminary W942508AH
Publication Release Date:August 6, 2001
- 45 - Revision A1
Headquarters
No. 4, Creation Rd. III,
Science-Based Industrial Park,
Hsinchu, Taiwan
TEL: 886-3-5770066
FAX: 886-3-5792766
http://www.winbond.com.tw/
Voice & Fax-on-demand: 886-2-27197006
Taipei Office
11F, No. 115, Sec. 3, Min-Sheng East Rd.,
Taipei, Taiwan
TEL: 886-2-27190505
FAX: 886-2-27197502
Winbond Electronics (H.K.) Ltd.
Unit 9-15, 22F, Millennium City,
No. 378 Kwun Tong Rd;
Kowloon, Hong Kong
TEL: 852-27513100
FAX: 852-27552064
Winbond Electronics North America Corp.
Winbond Memory Lab.
Winbond Microelectronics Corp.
Winbond Systems Lab.
2727 N. First Street, San Jose,
CA 95134, U.S.A.
TEL: 408-9436666
FAX: 408-5441798
Headquarters
No. 4, Creation Rd. III,
Science-Based Industrial Park,
Hsinchu, Taiwan
TEL: 886-3-5770066
FAX: 886-3-5792766
http://www.winbond.com.tw/
Voice & Fax-on-demand: 886-2-27197006
Taipei Office
11F, No. 115, Sec. 3, Min-Sheng East Rd.,
Taipei, Taiwan
TEL: 886-2-27190505
FAX: 886-2-27197502
Winbond Electronics (H.K.) Ltd.
Unit 9-15, 22F, Millennium City,
No. 378 Kwun Tong Rd;
Kowloon, Hong Kong
TEL: 852-27513100
FAX: 852-27552064
Winbond Electronics North America Corp.
Winbond Memory Lab.
Winbond Microelectronics Corp.
Winbond Systems Lab.
2727 N. First Street, San Jose,
CA 95134, U.S.A.
TEL: 408-9436666
FAX: 408-5441798
Note: All data and specifications are subject to change without notice.
