DS64BR401
DS64BR401 Quad Bi-Directional Repeater with Equalization and De-Emphasis
Literature Number: SNLS304F
DS64BR401
October 29, 2010
Quad Bi-Directional Repeater with Equalization and
De-Emphasis
General Description
The DS64BR401 is a quad lane bi-directional signal condi-
tioning repeater for 6.0/3.0/1.5 Gbps SATA/SAS and other
high-speed bus applications with data rates up to 6.4 Gbps.
The device performs both receive equalization and transmit
de-emphasis on each of its 8 channels to compensate for
channel loss, allowing maximum flexibility of physical place-
ment within a system. The receiver's continuous time linear
equalizer (CTLE) provides a boost of up to +33 dB at 3 GHz
and is capable of opening an input eye that is completely
closed due to inter-symbol interference (ISI) induced by the
interconnect medium. The transmitter features a pro-
grammable output de-emphasis driver and allows amplitude
voltage levels to be selected from 600 mVp-p to 1200 mVp-p
to suit multiple application scenarios. This Low Power Differ-
ential Signaling (LPDS) output driver is a power efficient
implementation that maintains compatibility with AC coupled
CML receiver. The programmable settings can be applied via
pin settings or SMBus interface.
To enable seamless upgrade from SAS/SATA 3.0 Gbps to 6.0
Gbps data rates without compromising physical reach,
DS64BR401 automatically detects the incoming data rate and
selects the optimal de-emphasis pulse width. The device de-
tects the out-of-band (OOB) idle and active signals of the
SAS/SATA specification and passes through with minimum
signal distortion.
With a typical power consumption of 200 mW/lane (100 mW/
channel) at 6.4 Gbps, and control to turn-off unused channels,
the DS64BR401 is part of National's PowerWise family of en-
ergy efficient devices.
Features
■Quad lane bi-directional repeater up to 6.4 Gbps rate
■Signal conditioning on input and output for extended reach
■Adjustable receive equalization up to +33 dB gain
■Adjustable transmit de-emphasis up to −12 dB
■Adjustable transmit VOD (600 mVp-p to 1200 mVp-p)
■<0.25 UI of residual DJ at 6.4 Gbps with 40” FR4 trace
■Automatic de-emphasis scaling based on rate detect
■SATA/SAS: OOB signal pass-through,
<3 ns (typ) envelope distortion
■Adjustable electrical IDLE detect threshold
■Low power (100 mW/channel), per-channel power down
■Programmable via pin selection or SMBus interface
■Single supply operation at 2.5V ±5%
■>6 kV HBM ESD Rating
■3.3V LVCMOS input tolerant for SMBus interface
■High speed signal flow–thru pinout package: 54-pin LLP
(10 mm x 5.5 mm)
Applications
■SATA (1.5, 3.0 and 6 Gbps)
■SAS (1.5, 3.0 and 6 Gbps)
■XAUI (3.125 Gbps), RXAUI (6.25 Gbps)
■sRIO – Serial Rapid I/O
■Fibre Channel (4.25 Gbps)
■10GBase-CX4, InfiniBand 4x (SDR & DDR)
■QSFP active copper cable modules
■High-speed active cable and FR-4 backplane traces
Typical Cable Application
30073081
© 2010 National Semiconductor Corporation 300730 www.national.com
DS64BR401 Quad Bi-Directional Repeater with Equalization and De-Emphasis
Typical Application Connection Diagram
30073080
Block Diagram - Detail View of the
Each Channel (1 of 8)
30073086
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DS64BR401
Pin Diagram
30073092
DS64BR401 Pin Diagram 54L LLP
Ordering Information
NSID Qty Spec Package
DS64BR401SQ Tape & Reel Supplied As 2,000 Units NOPB SQA54A
DS64BR401SQE Tape & Reel Supplied As 250 Units NOPB SQA54A
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DS64BR401
Pin Descriptions
Pin Name Pin Number I/O, Type Pin Descriptions
Differential High Speed I/O's
IA_0+, IA_0- ,
IA_1+, IA_1-,
IA_2+, IA_2-,
IA_3+, IA_3-
10, 11
12, 13
15, 16
17, 18
I, CML Inverting and non-inverting CML differential inputs to the
equalizer. A gated on-chip 50Ω termination resistor connects
INA_n+ to VDD and INA_n- to VDD when enabled.
OA_0+, OA_0-,
OA_1+, OA_1-,
OA_2+, OA_2-,
OA_3+, OA_3-
35, 34
33, 32
31, 30
29, 28
O, LPDS Inverting and non-inverting low power differential signaling
(LPDS) 50Ω outputs with de-emphasis. Compatible with AC
coupled CML inputs.
IB_0+, IB_0- ,
IB_1+, IB_1-,
IB_2+, IB_2-,
IB_3+, IB_3-
45, 44
43, 42
40, 39
38, 37
I, CML Inverting and non-inverting CML differential inputs to the
equalizer. A gated on-chip 50Ω termination resistor connects
INB_n+ to VDD and INB_n- to VDD when enabled.
OB_0+, OB_0-,
OB_1+, OB_1-,
OB_2+, OB_2-,
OB_3+, OB_3-
1, 2
3, 4
5, 6
7, 8
O, LPDS Inverting and non-inverting low power differential signaling
(LPDS) 50Ω outputs with de-emphasis. Compatible with AC
coupled CML inputs.
Control Pins — Shared (LVCMOS)
ENSMB 48 I, LVCMOS w/
internal pull-
down
System Management Bus (SMBus) enable pin.
When pulled high provide access internal digital registers that
are a means of auxiliary control for such functions as
equalization, de-emphasis, VOD, rate, and idle detection
threshold.
When pulled low, access to the SMBus registers are disabled
and SMBus function pins are used to control the Equalizer
and De-Emphasis.
Please refer to “SMBus configuration Registers” section and
Electrical Characteristics - Serial Management Bus Interface
for detail information.
ENSMB = 1 (SMBUS MODE)
SCL 50 I, LVCMOS ENSMB = 1
SMBUS clock input pin is enabled. External pull-up resistor
maybe needed. Refer to RTERM in the SMBus specification.
SDA 49 I, LVCMOS
O, Open
Drain
ENSMB = 1
The SMBus bi-directional SDA pin is enabled. Data input or
open drain output. External pull-up resistor is required.
Refer to RTERM in the SMBus specification.
AD0–AD3 54, 53, 47, 46 I, LVCMOS w/
internal pull-
down
ENSMB = 1
SMBus Slave Address Inputs. In SMBus mode, these pins are
the user set SMBus slave address inputs. See section —
System Management Bus (SMBus) and Configuration
Registers for additional information.
ENSMB = 0 (NORMAL PIN MODE)
EQA0, EQA1
EQB0, EQB1
20, 19
46, 47
I, Float,
LVCMOS
EQA/B, 3–level controls the level of equalization of the A/B
sides. The EQA/B pins are active only when ENSMB is de-
asserted (Low). Each of the 4 A/B channels have the same
level unless controlled by the SMBus control registers. When
ENSMB goes high the SMBus registers provide independent
control of each lane. See Table 1,Table 2,Table 3
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DS64BR401
Pin Name Pin Number I/O, Type Pin Descriptions
DEMA0, DEMA1
DEMB0, DEMB1
49, 50
53, 54
I, Float,
LVCMOS
DEMA/B, 3–level controls the level of de-emphasis of the A/
B sides. The DEMA/B pins are only active when ENSMB is
de-asserted (Low). Each of the 4 A/B channels have the same
level unless controlled by the SMBus control registers. When
ENSMB goes High the SMBus registers provide independent
control of each lane. See Table 4
Control Pins — Both Modes (LVCMOS)
RATE 21 I, Float,
LVCMOS
RATE, 3–level controls the pulse width of de-emphasis of the
output.
RATE = 0 forces 3 Gbps,
RATE = 1 forces 6 Gbps,
RATE = Float enables auto rate detection and the pulse width
(pull-back) is set appropriately after each exit from IDLE. This
requires the transition from IDLE to ACTIVE state — OOB
signal. See Table 4
TXIDLEA,TXIDLEB 24, 25 I, Float,
LVCMOS
TXIDLEA/B, 3–level controls the driver output.
TXIDLEA/B = 0 disables the signal detect/squelch function for
all A/B outputs.
TXIDLEA/B = 1 forces the outputs to be muted (electrical idle).
TXIDLEA/B = Float enables the signal auto detect/squelch
function and the signal detect voltage threshold level can be
adjusted using the SD_TH pin. See Table 5
VOD0, VOD1 22, 23 I, LVCMOS w/
internal pull-
down
VOD[1:0] adjusts the output differential amplitude voltage
level.
VOD[1:0] = 00 sets output VOD = 600 mV (Default)
VOD[1:0] = 01 sets output VOD = 800 mV
VOD[1:0] = 10 sets output VOD = 1000 mV
VOD[1:0] = 11 sets output VOD = 1200 mV
PWDN 52 I, LVCMOS PWDN = 0 enables the device (normal operation).
PWDN = 1 disables the device (low power mode).
Pin must be driven to a logic low at all times for normal
operation
Analog
SD_TH 27 I, ANALOG Threshold select pin for electrical idle detect threshold. Float
pin for typical default 130 mVp-p (differential), otherwise
connect resistor from SD_TH to GND to set threshold voltage.
See Table 6, Figure 5
Power
VDD 9, 14, 36, 41,
51
Power Power supply pins. 2.5 V +/-5%
GND DAP Power DAP is the large metal contact at the bottom side, located at
the center of the 54 pin LLP package. It should be connected
to the GND plane with at least 4 via to lower the ground
impedance and improve the thermal performance of the
package.
NC 26 No Connect — Leave pin open
1 = HIGH, 0 = LOW, FLOAT = 3rd input state.
Don't drive FLOAT pin; pin is internally biased to mid level with 50 kΩ pull-up/pull-down.
Internal pulled-down = Internal 30 kΩ pull-down resistor to GND is present on the input.
Input edge rate for LVCMOS/FLOAT inputs must be faster than 50 ns from 10–90%.
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DS64BR401
Absolute Maximum Ratings (Note 1)
If Military/Aerospace specified devices are required,
please contact the National Semiconductor Sales Office/
Distributors for availability and specifications.
Supply Voltage (VDD) -0.5V to +3.0V
LVCMOS Input/Output Voltage -0.5V to +4.0V
CML Input Voltage -0.5V to (VDD+0.5V)
LPDS Output Voltage -0.5V to (VDD+0.5V)
Analog (SD_TH) -0.5V to (VDD+0.5V)
Junction Temperature +125°C
Storage Temperature -40°C to +125°C
Maximum Package Power Dissipation at 25°C
SQA54A Package 4.21 W
Derate SQA54A Package 52.6mW/°C above +25°C
ESD Rating
HBM, STD - JESD22-A114C ≥6 kV
MM, STD - JESD22-A115-A ≥250 V
CDM, STD - JESD22-C101-C ≥1250 V
Thermal Resistance
θJC 11.5°C/W
θJA, No Airflow, 4 layer JEDEC 19.1°C/W
For soldering specifications: see product folder at
www.national.com
www.national.com/ms/MS/MS-SOLDERING.pdf
Recommended Operating
Conditions
Min Typ Max Units
Supply Voltage
VDD to GND 2.375 2.5 2.625 V
Ambient Temperature -10 25 +85 °C
SMBus (SDA, SCL) 0 3.6 V
CML Differential Input
Voltage
0 2.0 Vp-p
Supply Noise Tolerance
up to 50 MHz, (Note 4)
100 mVp-p
Electrical Characteristics
Over recommended operating supply and temperature ranges with default register settings unless other specified. (Note 3)
Symbol Parameter Conditions Min Typ Max Units
POWER
PD Power Dissipation PWDN = 0,
EQx = 0, DEMx = 0 dB,
K28.5 pattern
VOD = 1.0 Vp-p
758 950 mW
PWDN = 1, ENSMB = 0 0.92 1.125 mW
LVCMOS / LVTTL DC SPECIFICATIONS
VIH High Level Input Voltage 2.0 3.6 V
VIL Low Level Input Voltage 0 0.8 V
IIH Input High Current VIN = 3.3V,
Inputs OPEN: SDA, SCL, PWDN -15 +15 μA
VIN = 3.3V,
Inputs with PULL-DOWN
and FLOAT — mid level
-15 +120 uA
IIL Input Low Current VIN = 0V,
Inputs OPEN: SDA, SCL, PWDN and with
PULL-DOWN
-15 +15 μA
VIN = 0V,
Inputs with FLOAT — mid level -80 +15 uA
CML RECEIVER INPUTS (IN_n+, IN_n-)
RLRX-DIFF Rx Differential Return Loss
(SDD11),
(Note 2)
150 MHz – 1.5 GHz -20
dB150 MHz – 3.0 GHz -13.5
150 MHz – 6.0 GHz -8
RLRX-CM Rx Common Mode Input
Return Loss (SCC11)
150 MHz – 3.0 GHz, (Note 2) -10 dB
RRX-IB Rx Impedance Balance
(SDC11)
150 MHz – 3.0 GHz, (Note 2) -27 dB
IIN Maximum current allowed at
IN+ or IN- input pin.
−30 +30 mA
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DS64BR401
Symbol Parameter Conditions Min Typ Max Units
RIN Input Resistance Single ended to VDD, (Note 2) 50 Ω
RITD Input Differential Impedance
between
IN+ and IN-
DC tested, (Note 2)
85 100 115 Ω
RITIB Input Differential Impedance
Imbalance
DC tested, (Note 2) 5 Ω
RICM Input Common Mode
Impedance
DC tested, (Note 2)20 25 35 Ω
VRX-DIFF Differential Rx peak to peak
voltage
DC voltage,
SD_TH = 20 kΩ to GND 0.1 1.2 V
VRX-SD_TH Electrical Idle detect
threshold (differential)
SD_TH = Float, (Note 6),Figure 5 40 175 mVp-p
LPDS OUTPUTS (OUT_n+, OUT_n-)
VOD Output Voltage Swing RL = 50 Ω ±1% to GND (AC coupled with 10
nF), 6.4 Gbps, (Note 5)
DEMx = 0 dB,
VOD[1:0] = 00
500 600 700 mVP-P
VOD[1:0] = 11 1100 1265 1450 mVP-P
VOCM Output Common-Mode
Voltage
Single-ended measurement DC-Coupled
with 50Ω termination,
(Note 2)
VDD –
1.4
V
TTX-RF Transmitter Rise/ Fall Time 20% to 80% of differential output voltage,
measured within 1” from output pins,
(Note 2, Note 5), Figure 1
67 85 ps
TRF-DELTA Tx rise/fall mismatch 20% to 80% of differential output voltage,
(Note 2, Note 5) 0.1 UI
RLTX-DIFF Tx Differential Return Loss
(SDD22),
(Note 2)
Repeating 1100b (D24.3) pattern,
VOD = 1.0 Vp-p,
150 MHz – 1.5 GHz
-11
dB
150 MHz – 3.0 GHz -10
150 MHz – 6.0 GHz -5
RLTX-CM Tx Common Mode Return
Loss
(SCC22)
Repeating 1100b (D24.3) pattern,
VOD = 1.0 Vp-p, (Note 2)
50 MHz – 3.0 GHz
-10 dB
RTX-IB Tx Impedance Balance
(SDC22)
Repeating 1100b (D24.3) pattern,
VOD = 1.0 Vp-p, (Note 2)
50 MHz – 3.0 GHz
-30 dB
ITX-SHORT Tx Output Short Circuit
Current Limit
OA/B_n = GND 90 mA
ROTD Output Differential
Impedance between OUT+
and OUT-
DC tested, (Note 2)
85 100 125 Ω
ROTIB Output Differential
Impedance Imbalance
DC tested, (Note 2) 5 Ω
ROCM Output Common Mode
Impedance
DC tested, (Note 2)20 25 35 Ω
VTX-CM-DELTA Common Mode Voltage
Delta between active burst
and electrical Idle of an OOB
signal
(Note 7)
±40 mV
TDI Max time to transition to valid
electrical idle after leaving
active burst in OOB signaling
VIN = 800 mVp-p, repeating 1100b (D24.3)
pattern at 3 Gbps,
SD_TH = Float, Figure 3
6.5 9.5 ns
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DS64BR401
Symbol Parameter Conditions Min Typ Max Units
TID Max time to transition to valid
active burst after leaving idle
in OOB signaling
VIN = 800 mVp-p, repeating 1100b (D24.3)
pattern at 3 Gbps,
SD_TH = Float, Figure 3
5.5 8 ns
TPD Differential Propagation
Delay (Low to High and High
to Low Edge)
Propagation delay measured at midpoint
crossing between input to output, Figure 2,
EQx[1:0] = 11, DEMx[1:0] = −6 dB
150 200 250 ps
EQx[1:0] = OFF, DEMx[1:0] = 0 dB 120 170 220 ps
TLSK Lane to Lane Skew in a
Single Part
VDD = 2.5 V, TA = 25°C 27 ps
TPPSK Part to Part Propagation
Delay Skew
VDD = 2.5 V, TA = 25°C 35 ps
EQUALIZATION
DJ1 Residual Deterministic Jitter
at 6.4 Gbps
Tx Launch Amplitude = 0.8 to
1.2 Vp–p, 40” 4–mil FR4 trace,
EQx[1:0] = 0F, DEMx[1:0] = 0 dB,
VOD = 1.0 Vp-p, K28.5,
SD_TH = float, (Note 2)
0.12 0.25 UIP-P
DJ2 Residual Deterministic Jitter
at 6.4 Gbps
Tx Launch Amplitude = 0.8 to
1.2 Vp–p, 12 meters (30 AWG),
EQx[1:0] = 1F, DEMx[1:0] = 0 dB,
VOD = 1.0 Vp-p, K28.5,
SD_TH = float, (Note 2)
0.05 0.15 UIP-P
DJ3 Residual Deterministic Jitter
at 3.2 Gbps
Tx Launch Amplitude = 0.8 to
1.2 Vp–p, 40” 4–mil FR4 trace,
EQx[1:0] = 0F, DEMx[1:0] = 0 dB,
VOD = 1.0 Vp-p, K28.5,
SD_TH = float, (Note 2)
0.05 0.12 UIP-P
DJ4 Residual Deterministic Jitter
at 3.2 Gbps
Tx Launch Amplitude = 0.8 to
1.2 Vp–p, 12 meters (30 AWG),
EQx[1:0] = 1F, DEMx[1:0] = 0 dB,
VOD = 1.0 Vp-p, K28.5,
SD_TH = float, (Note 2)
0.06 0.16 UIP-P
RJ Random Jitter Tx Launch Amplitude = 0.8 to 1.2 Vp–p,
Repeating 1100b (D24.3) pattern 0.5 psrms
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DS64BR401
Symbol Parameter Conditions Min Typ Max Units
DE-EMPHASIS
DJ5 Residual Deterministic Jitter
at 6.4 Gbps
Tx Launch amplitude = 0.8 to
1.2 Vp–p, 10” 4–mil FR4 trace,
EQx[1:0] = OFF, DEMx[1:0] = −6 dB,
VOD = 1.0 Vp-p, K28.5, RATE = 1 (Note 2)
0.09 0.20 UIP-P
DJ6 Residual Deterministic Jitter
at 3.2 Gbps
Tx Launch amplitude = 0.8 to
1.2 Vp–p, 20” 4–mil FR4 trace,
EQx[1:0] = OFF, DEMx[1:0] = −6 dB,
VOD = 1.0 Vp-p, K28.5, RATE = 0 (Note 2)
0.07 0.18 UIP-P
Note 1: “Absolute Maximum Ratings” indicate limits beyond which damage to the device may occur, including inoperability and degradation of device reliability
and/or performance. Functional operation of the device and/or non-degradation at the Absolute Maximum Ratings or other conditions beyond those indicated in
the Recommended Operating Conditions is not implied. The Recommended Operating Conditions indicate conditions at which the device is functional and the
device should not be operated beyond such conditions. Absolute Maximum Numbers are guaranteed for a junction temperature range of -40°C to +125°C. Models
are validated to Maximum Operating Voltages only.
Note 2: Typical values represent most likely parametric norms at VDD = 2.5V, TA = 25°C., and at the Recommended Operation Conditions at the time of product
characterization and are not guaranteed.
Note 3: The Electrical Characteristics tables list guaranteed specifications under the listed Recommended Operating Conditions except as otherwise modified
or specified by the Electrical Characteristics Conditions and/or Notes. Typical specifications are estimations only and are not guaranteed.
Note 4: Allowed supply noise (mVP-P sine wave) under typical conditions.
Note 5: Measured with clock-like {11111 00000} pattern.
Note 6: Measured at package pins of receiver. The 130 mVp-p is a typical threshold level and does not include hysteresis, thus less than 40 mVp-p is IDLE,
greater than 175 mVp-p is ACTIVE. SD_TH pin connected with resistor to GND overrides this default setting.
Note 7: Common-mode voltage (VCM) is expressed mathematically as the average of the two signal voltages with respect to local ground.
VCM = (A + B) / 2, A = OUT+, B = OUT-.
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DS64BR401
Electrical Characteristics — Serial Management Bus Interface
Over recommended operating supply and temperature ranges unless other specified.
Symbol Parameter Conditions Min Typ Max Units
SERIAL BUS INTERFACE DC SPECIFICATIONS
VOL Data (SDA) Low Level Output
Voltage
IOL = 3mA 0.4 V
VIL Data (SDA), Clock (SCL) Input
Low Voltage
0.8 V
VIH Data (SDA), Clock (SCL) Input
High Voltage
2.1 3.6 V
IPULLUP Current Through Pull-Up Resistor
or Current Source
High Power Specification 4 mA
VDD Nominal Bus Voltage 2.375 3.6 V
ILEAK-Bus Input Leakage Per Bus Segment (Note 8)-200 +200 µA
ILEAK-Pin Input Leakage Per Device Pin -15 µA
CICapacitance for SDA and SCL (Note 8, Note 9) 10 pF
RTERM External Termination Resistance
pull to VDD = 2.5V ± 5% OR 3.3V ±
10%
VDD3.3,
(Note 8, Note 9, Note 10)
2000 Ω
VDD2.5,
(Note 8, Note 9, Note 10)
1000 Ω
SERIAL BUS INTERFACE TIMING SPECIFICATIONS. See Figure 4
FSMB Bus Operating Frequency (Note 11) 10 100 kHz
TBUF Bus Free Time Between Stop and
Start Condition
4.7 µs
THD:STA Hold time after (Repeated) Start
Condition. After this period, the first
clock is generated.
At IPULLUP, Max
4.0 µs
TSU:STA Repeated Start Condition Setup
Time
4.7 µs
TSU:STO Stop Condition Setup Time 4.0 µs
THD:DAT Data Hold Time 300 ns
TSU:DAT Data Setup Time 250 ns
TTIMEOUT Detect Clock Low Timeout (Note 11)25 35 ms
TLOW Clock Low Period 4.7 µs
THIGH Clock High Period (Note 11)4.0 50 µs
TLOW:SEXT Cumulative Clock Low Extend
Time (Slave Device)
(Note 11) 2 ms
tFClock/Data Fall Time (Note 11) 300 ns
tRClock/Data Rise Time (Note 11) 1000 ns
tPOR Time in which a device must be
operational after power-on reset
(Note 11) 500 ms
Note 8: Recommended value. Parameter not tested in production.
Note 9: Recommended maximum capacitance load per bus segment is 400pF.
Note 10: Maximum termination voltage should be identical to the device supply voltage.
Note 11: Compliant to SMBus 2.0 physical layer specification. See System Management Bus (SMBus) Specification Version 2.0, section 3.1.1 SMBus common
AC specifications for details.
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DS64BR401
Timing Diagrams
30073003
FIGURE 1. LPDS Output Transition Times
30073004
FIGURE 2. Propagation Delay Timing Diagram
30073005
FIGURE 3. Idle Timing Diagram
30073094
FIGURE 4. SMBus Timing Parameters
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DS64BR401
Functional Description
The DS64BR401 is a quad repeater optimized for backplane
trace or cable interconnect up to 6.4 Gbps. The DS64BR401
operates in two modes: Pin Control Mode (ENSMB = 0) and
SMBus Mode (ENSMB = 1).
Pin Control Mode:
When in pin mode (ENSMB = 0) , the repeater is configurable
with external pins. Equalization and de-emphasis can be se-
lected via pin for each side independently. When de-empha-
sis is asserted VOD is automatically increased per the De-
Emphasis table below for improved performance over lossy
media. Rate optimization is also pin controllable, with pin se-
lections for 3 Gbps, 6 Gbps, and auto detect. The receiver
electrical idle detect threshold is also programmable via an
optional external resistor on the SD_TH pin.
SMBUS Mode
When in SMBus mode the equalization, de-emphasis are all
programmable on a individual lane basis, instead of grouped
by sides as in the pin mode case. Upon assertion of ENSMB
the RATE, EQx and DEMx functions revert to register control
immediately. The EQx and DEMx pins are converted to AD0-
AD3 SMBus address inputs. The other external control pins
remain active unless their respective registers are written to
and the appropriate override bit is set, in which case they are
ignored until ENSMB is driven low. On powerup and when
ENSMB is driven low all registers are reset to their default
state. If PWDN = 1 is asserted while ENSMB = 1, the registers
retain their current state.
Equalization settings accessible via the pin controls were
chosen to meet the needs of most applications. If additional
fine tuning or adjustment is needed, additional equalization
settings can be accessed via the SMBus registers. Each input
has a total of 24 possible equalization settings. The tables
show a typical gain for each gain stage (GST[4:3]) and boost
level (BST[2:0]) combination. When using SMBus mode, the
Equalization and De-Emphasis levels are set using registers.
See Table 8 (register map) for more information.
TABLE 1. Equalization Settings with GST=1 for Pins or SMBus Registers
EQ1 EQ0
EQ Setting EQ Gain (dB)
Suggested Use
GST
[4:3]
BST
[2:0]
1.5 GHz 3.0 GHz
F F 00 000 0 0 Bypass - Default Setting
01 000 2.0 3.8
01 001 2.6 4.9
1 1 01 010 3.3 5.8 8 inch FR4 (4-mil trace) or < 0.7m (30 AWG)
01 011 3.9 6.8
01 100 4.9 8.2
01 101 5.5 8.9
01 110 6.0 9.4
01 111 6.5 10.0
F=Float (don't drive pin, each float pin has an internal 50K Ohm resistor to VDD and GND), 1=High, 0=Low
TABLE 2. Equalization Settings with GST=2 for Pins or SMBus Registers
EQ1 EQ0
EQ Setting EQ Gain (dB)
Suggested Use
GST
[4:3]
BST
[2:0]
1.5 GHz 3.0 GHz
0 0 10 000 4.8 9.2 12” FR4 (4-mil trace) or 1m (30 AWG)
F 0 10 001 6.3 11.7 20” FR4 (4-mil trace) or 5m (30 AWG)
10 010 7.6 13.6
10 011 9.1 15.6
F 1 10 100 11.1 18.4 35” FR4 (4-mil trace) or 9m (30 AWG)
0 1 10 101 12.4 20.0 40” FR4 (4-mil trace) or 10m (30 AWG)
10 110 13.4 20.9
10 111 14.5 22.0
F=Float (don't drive pin, each float pin has an internal 50K Ohm resistor to VDD and GND), 1=High, 0=Low
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DS64BR401
TABLE 3. Equalization Settings with GST=3 for Pins or SMBus Registers
EQ1 EQ0
EQ Setting EQ Gain (dB)
Suggested Use
GST
[4:3]
BST
[2:0]
1.5 GHz 3.0 GHz
1 0 11 000 7.7 14.6 25” FR4 (4-mil trace) or 6m (30 AWG)
11 001 10.1 18.4
0 F 11 010 12.2 21.2 10m (30 AWG)
11 011 14.4 24.4
1 F 11 100 17.5 28.4 12m (30 AWG)
11 101 19.4 30.6
11 110 20.9 32.1
11 111 22.6 33.8
F=Float (don't drive pin, each float pin has an internal 50K Ohm resistor to VDD and GND), 1=High, 0=Low
TABLE 4. De-Emphasis Input Select Pins for A and B ports (3–Level Input)
RATE DEM1 DEM0 De-
Emphasi
s Level
(typ)
DE Pulse
Width
(typ)
VOD (typical) Suggested Use
0/F 0 0 0 dB 0 ps VOD: 600 to 1200 mVp-p 10 inch FR4 trace or 1 meter (28 AWG)
0/F 0 1 -3.5 dB 330 ps VOD = 1000 mVp-p 20 inch FR4 trace or 2 meters (28 AWG)
-2 dB 330 ps VOD = 1200 mVp-p 15 inch FR4 trace or 2 meters (28 AWG)
0/F 1 0 -6 dB 330 ps VOD = 1000 mVp-p 25 inch FR4 trace or 3 meters (28 AWG)
-3 dB 330 ps VOD = 1200 mVp-p 20 inch FR4 trace or 2 meters (28 AWG)
0/F 1 1 -9 dB 300 ps
enhanced
VOD = 1000 mVp-p 5 meters (28 AWG)
-11 dB 300 ps
enhanced
VOD = 1200 mVp-p 7 meters (28 AWG)
0/F 0 F -6 dB 300 ps
enhanced
VOD = 1000 mVp-p 5 meters (26 AWG)
-8 dB 300 ps
enhanced
VOD = 1200 mVp-p 7 meters (26 AWG)
0/F 1 F -12 dB 300 ps
enhanced
VOD = 1000 mVp-p 8 meters (24 AWG)
-13 dB 300 ps
enhanced
VOD = 1200 mVp-p 9 meters (24 AWG)
0/F F 0 -9 dB 250 ps
enhanced
VOD = 1000 + 200 mVp-p 8 meters (26 AWG)
-10 dB 250 ps
enhanced
VOD = 1200 + 200 mVp-p 9 meters (26 AWG)
0/F F 1 -12 dB 250 ps
enhanced
VOD: (1000 to 1200) + 200 mVp-p 10 meters (24 AWG)
0/F F F Reserved, don't use
1/F 0 0 0 dB 0 ps VOD: 600 to 1200 mVp-p 5 inch FR4 trace or 0.5 meter (28 AWG)
1/F 0 1 -3.5 dB 200 ps VOD = 1000 mVp-p 10 inch FR4 trace or 1 meter (28 AWG)
-2 dB 200 ps VOD = 1200 mVp-p 10 inch FR4 trace or 1 meters (28 AWG)
1/F 1 0 -6 dB 200 ps VOD = 1000 mVp-p 20 inch FR4 trace or 2 meters (28 AWG)
-3 dB 200 ps VOD = 1200 mVp-p 15 inch FR4 trace or 1 meters (28 AWG)
1/F 1 1 -9 dB 180 ps
enhanced
VOD = 1000 mVp-p 3 meters (28 AWG)
-11 dB 180 ps
enhanced
VOD = 1200 mVp-p 4 meters (28 AWG)
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DS64BR401
RATE DEM1 DEM0 De-
Emphasi
s Level
(typ)
DE Pulse
Width
(typ)
VOD (typical) Suggested Use
1/F 0 F -6 dB 180 ps
enhanced
VOD = 1000 mVp-p 3 meters (26 AWG)
-8 dB 180 ps
enhanced
VOD = 1200 mVp-p 4 meters (26 AWG)
1/F 1 F -12 dB 180 ps
enhanced
VOD = 1000 mVp-p 5 meters (24 AWG)
-13 dB 180 ps
enhanced
VOD = 1200 mVp-p 6 meters (24 AWG)
1/F F 0 -9 dB 160 ps
enhanced
VOD = 1000 + 200 mVp-p 5 meters (26 AWG)
-10 dB 160 ps
enhanced
VOD = 1200 + 200 mVp-p 6 meters (26 AWG)
1/F F 1 -12 dB 160 ps
enhanced
VOD: (1000 to 1200) + 200 mVp-p 7 meters (24 AWG)
1/F F F Reserved, don't use
Note: F = Float (don't drive pin), 1 = High and 0 = Low. Enhanced DE pulse width provides de-empahsis on second bit.
When RATE = F (auto rate detection active), the DE level and pulse width settings follow detected rate after exiting IDLE. RATE
= 0 is 3 Gbps and RATE = 1 is 6 Gbps. De-emphasis should only be used with VOD = 1000 mVp-p or 1200 mVp-p. VOD less
then 1000 mVp-p is not recommended with de-emphasis. Please refer to VOD1 and VOD0 pin description to set the output
differential voltage level.
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DS64BR401
TABLE 5. Idle Control (3–Level Input)
TXIDLEA/B Function
0 This state is for lossy media, dedicated Idle threshold detect circuit disabled, output follows input based
on EQ settings. Idle state not guaranteed.
Float Float enables automatic idle detection. Idle on the input is passed to the output. Internal 50KΩ resistors
hold TXIDLEA/B pin at a mid level - don't connect this pin if the automatic idle detect function is desired.
This is the default state. Output in Idle if differential input signal less than value set by SD_TH pin.
1 Manual override, output in electrical Idle. Differential inputs are ignored.
TABLE 6. Receiver Electrical Idle Detect Threshold Adjust
SD_TH resistor value (Ω) Receiver Electrical Idle Detect Threshold (DIFF p-p)
Float (no resistor required) 130 mV (default condition)
0 225 mV
80k 20 mV
SD_TH resistor value can be set from 0 through 80k ohms to achieve desired idle detect threshold, see Figure 5
Typical Performance Curves
30073093
FIGURE 5. Typical Idle Threshold vs. SD_TH resistor value
30073095
FIGURE 6. Typical Power Dissipation (PD) vs. Output Differential Voltage (VOD)
15 www.national.com
DS64BR401
System Management Bus (SMBus)
and Configuration Registers
The System Management Bus interface is compatible to SM-
Bus 2.0 physical layer specification. ENSMB must be pulled
high to enable SMBus mode and allow access to the config-
uration registers.
The DS64BR401 has the AD[3:0] inputs in SMBus mode.
These pins set the SMBus slave address inputs. The AD[3:0]
pins have internal pull-down. When left floating or pulled low
the AD[3:0] = 0000'b, the device default address byte is A0'h.
Based on the SMBus 2.0 specification, the DS64BR401 has
a 7-bit slave address of 1010000'b. The LSB is set to 0'b (for
a WRITE), thus the 8-bit value is 1010 0000'b or A0'h. The
bold bits indicate the AD[3:0] pin map to the slave address
bits [4:1]. The device address byte can be set with the use of
the AD[3:0] inputs. Below are some examples.
AD[3:0] = 0001'b, the device address byte is A2'h
AD[3:0] = 0010'b, the device address byte is A4'h
AD[3:0] = 0100'b, the device address byte is A8'h
AD[3:0] = 1000'b, the device address byte is B0'h
The SDA, SCL pins are 3.3V tolerant, but are not 5V tolerant.
External pull-up resistor is required on the SDA. The resistor
value can be from 1 kΩ to 5 kΩ depending on the voltage,
loading and speed. The SCL may also require an external
pull-up resistor and it depends on the Host that drives the bus.
TRANSFER OF DATA VIA THE SMBUS
During normal operation the data on SDA must be stable dur-
ing the time when SCL is High.
There are three unique states for the SMBus:
START: A High-to-Low transition on SDA while SCL is High
indicates a message START condition.
STOP: A Low-to-High transition on SDA while SCL is High
indicates a message STOP condition.
IDLE: If SCL and SDA are both High for a time exceeding
tBUF from the last detected STOP condition or if they are High
for a total exceeding the maximum specification for tHIGH then
the bus will transfer to the IDLE state.
SMBUS TRANSACTIONS
The device supports WRITE and READ transactions. See
Register Description table for register address, type (Read/
Write, Read Only), default value and function information.
When SMBus is enabled, the DS64BR401 must use one of
the following De-emphasis settings (Table 7). The driver
de-emphasis value is set on a per channel basis using 8 dif-
ferent registers. Each register (0x11, 0x18, 0x1F, 0x26, 0x2E,
0x35, 0x3C, 0x43) requires one of the following De-emphasis
settings when in SMBus mode.
TABLE 7. De-Emphasis Register Settings (must write one of the following when in SMBus mode)
De-Emphasis Value Register Setting 3 Gbps Operation 6 Gbps Operation
0.0 dB 0x01 10” trace or 1 meter 28 awg cable 5” trace or 0.5 meter 28 awg cable
-3.5 dB 0x38 20” trace or 2 meters 28 awg cable 10” trace or 1meters 28 awg cable
-6 dB 0x88 25” trace or 3 meters cable 20” trace or 2 meters cable
-9 dB 0x90 5 meters 28 awg cable 3 meters 28 awg cable
-12 dB 0xA0 8 meters 28 awg cable 5 meters 28 awg cable
WRITING A REGISTER
To write a register, the following protocol is used (see SMBus
2.0 specification).
1. The Host drives a START condition, the 7-bit SMBus
address, and a “0” indicating a WRITE.
2. The Device (Slave) drives the ACK bit (“0”).
3. The Host drives the 8-bit Register Address.
4. The Device drives an ACK bit (“0”).
5. The Host drive the 8-bit data byte.
6. The Device drives an ACK bit (“0”).
7. The Host drives a STOP condition.
The WRITE transaction is completed, the bus goes IDLE and
communication with other SMBus devices may now occur.
READING A REGISTER
To read a register, the following protocol is used (see SMBus
2.0 specification).
1. The Host drives a START condition, the 7-bit SMBus
address, and a “0” indicating a WRITE.
2. The Device (Slave) drives the ACK bit (“0”).
3. The Host drives the 8-bit Register Address.
4. The Device drives an ACK bit (“0”).
5. The Host drives a START condition.
6. The Host drives the 7-bit SMBus Address, and a “1”
indicating a READ.
7. The Device drives an ACK bit “0”.
8. The Device drives the 8-bit data value (register contents).
9. The Host drives a NACK bit “1”indicating end of the
READ transfer.
10. The Host drives a STOP condition.
The READ transaction is completed, the bus goes IDLE and
communication with other SMBus devices may now occur.
RECOMMENDED SMBUS REGISTER SETTINGS
When SMBus mode is enabled (ENSMB = 1), the default reg-
ister are not configured to an appropriate settings. Below is
the recommended settings to configure the EQ, VOD and DE
to a medium level that supports interconnect length of 20
inches FR4 trace or 3 to 5 meters of cable length. Please refer
to , Table 1,Table 2,Table 3,Table 4, Table 7,Table 8 for ad-
ditional information and recommended settings.
1. Reset the SMBus registers to default values:
Write 01'h to address 0x00.
2. Set de-emphasis to -6 dB enhance for all channels
(CH0–CH7):
Write 88'h to address 0x11, 0x18, 0x1F, 0x26, 0x2E,
0x35, 0x3C, 0x43.
3. Set equalization to external pin level EQ[1:0] = 00 (~9 dB
at 3 GHz) for all channels (CH0–CH7):
Write 30'h to address 0x0F, 0x16, 0x1D, 0x24, 0x2C,
0x33, 0x3A, 0x41.
4. Set VOD = 1.0V for all channels (CH0–CH7):
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DS64BR401
Write 0F'h to address 0x10, 0x17, 0x1E, 0x25, 0x2D,
0x34, 0x3B, 0x42.
Idle and Rate Detection to External
Pins
The functions of IDLE and RATE detection to external pins for
monitoring can be supported in SMBus mode. The external
GPIO pins of 19, 20, 46 and 47 will be changed and they will
serve as outputs for IDLE and RATE detect signals.
The following external pins should be set to auto detection:
RATE = F (FLOAT) – auto RATE detect enabled
TXIDLEA/B = F (FLOAT) – auto IDLE detect enabled
There are 4 GPIO pins that can be configured as outputs with
reg_4E[0].
To disable the external SMBus address pins, so pin 46 and
47 can be used as outputs:
Write 01'h to address 0x4E.
Care must be taken to ensure that only the desired status
block is enabled and attached to the external pin as the status
blocks can be OR’ed together internally. Register bits reg_47
[5:4] and bits reg_4C[7:6] are used to enable each of the sta-
tus block outputs to the external pins. The channel status
blocks can be internally OR’ed together to monitor more than
one channel at a time. This allows more information to be
presented on the status outputs and later if desired, a diag-
nosis of the channel identity can be made with additional
SMBus writes to register bits reg_47[5:4] and bits reg_4C
[7:6].
Below are examples to configure the device and bring the in-
ternal IDLE and RATE status to pins 19, 20, 46, 47.
To monitor the IDLE detect with two channels ORed (CH0
with CH2, CH1 with CH3, CH4 with CH6, CH5 with CH7):
Write 32'h to address 0x47.
The following IDLE status should be observable on the ex-
ternal pins:
pin 19 – CH0 with CH2,
pin 20 – CH1 with CH3,
pin 46 – CH4 with CH6,
pin 47 – CH5 with CH7.
Pin = HIGH (VDD) means IDLE is detected (no signal
present).
Pin = LOW (GND) means ACTIVE (data signal present).
To monitor the RATE detect with two channels ORed (CH0
with CH2, CH1 with CH3, CH4 with CH6, CH5 with CH7):
Write C0'h to address 0x4C.
The following RATE status should be observable on the ex-
ternal pins:
pin 19 – CH0 with CH2,
pin 20 – CH1 with CH3,
pin 46 – CH4 with CH6,
pin 47 – CH5 with CH7.
Pin = HIGH (VDD) means high data rate is detected (6 Gbps).
Pin = LOW (GND) means low rate is detected (3 Gbps).
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DS64BR401
TABLE 8. SMBus Register Map
Address Register Name Bit (s) Field Type Default Description
0x00 Reset 7:1 Reserved R/W 0x00 Set bits to 0.
0 Reset SMBus Reset
1: Reset registers to default value
0x01 PWDN Channels 7:0 PWDN CHx R/W 0x00 Power Down per Channel
[7]: CHA_3
[6]: CHA_2
[5]: CHA_1
[4]: CHA_0
[3]: CHB_3
[2]: CHB_2
[1]: CHB_1
[0]: CHB_0
00'h = all channels enabled
FF'h = all channels disabled
0x02 PWDN Control 7:1 Reserved R/W 0x00 Set bits to 0.
0 Override PWDN 0: Allow PWDN pin control
1: Block PWDN pin control
0x08 Pin Control Override 7:5 Reserved R/W 0x00 Set bits to 0.
4 Override IDLE 0: Allow IDLE pin control
1: Block IDLE pin control
3 Reserved Set bit to 0.
2 Override RATE 0: Allow RATE pin control
1: Block RATE pin control
1:0 Reserved Set bits to 0.
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DS64BR401
Address Register Name Bit (s) Field Type Default Description
0x0E CH0 - CHB0
IDLE RATE Select
7:6 Reserved R/W 0x00 Set bits to 0.
5 IDLE auto 0: Allow IDLE_sel control in Bit 4
1: Automatic IDLE detect
4 IDLE select 0: Output is ON (SD is disabled)
1: Output is muted (electrical idle)
3:2 Reserved Set bits to 0.
1 RATE auto 0: Allow RATE_sel control in Bit 0
1: Automatic RATE detect
0 RATE select 0: 2.5 to 3.2 Gbps
1: 5.0 to 6.4 Gbps
0x0F CH0 - CHB0
EQ Control
7:6 Reserved R 0x0 Set bits to 0.
5:0 CH0 IB0 EQ R/W 0x20 IB0 EQ Control - total of 24 levels
(3 gain stages with 8 settings)
[5]: Enable EQ
[4:3]: Gain Stage Control
[2:0]: Boost Level Control
Pin [EQ0 EQ1] = Register [EN] [GST] [BST] =
Hex Value
FF = 100000 = 20'h = Bypass (Default)
11 = 101010 = 2A'h
00 = 110000 = 30'h
0F = 110001 = 31'h
01 = 111000 = 38'h
1F = 110100 = 34'h
10 = 110101 = 35'h
F0 = 111010 = 3A'h
F1 = 111100 = 3C'h
0x10 CH0 - CHB0
VOD Control
7:6 Reserved R 0x00 Set bit to 0.
5:0 CH0 OB0 VOD R/W 0x03 OB0 VOD Control
03'h = 600 mV (Default)
07'h = 800 mV
0F'h = 1000 mV
1F'h = 1200 mV
3F'h = 1400 mV
0x11 CH0 - CHB0
DE Control
7:0 CH0 OB0 DEM R/W 0x03 OB0 DEM Control
[7]: DEM TYPE (Compatibility = 0 / Enhanced
= 1)
[6:0]: DEM Level Control
Pin [DEM1 DEM0] = Register [TYPE] [Level
Control] = Hex Value
00 = 00000001 = 01'h = 0.0 dB
01 = 00111000 = 38'h = −3.5 dB
0F = 10001000 = 88'h = −6.0 dB
01 = 10010000 = 90'h = −9.0 dB
1F = 10100000 = A0'h = −12.0 dB
F0 = 10010000 = 90'h = −9.0 dB
F1 = 10100000 = A0'h = −12.0 dB
FF = 11000000 = C0'h = Reserved
0x12 CH0 - CHB0
IDLE Threshold
7:4 Reserved R/W 0x00 Set bits to 0.
3:0 IDLE threshold De-assert = [3:2], assert = [1:0]
00 = 110 mV, 70 mV (Default)
01 = 150 mV, 110 mV
10 = 170 mV, 130 mV
11 = 190 mV, 150 mV
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DS64BR401
Address Register Name Bit (s) Field Type Default Description
0x15 CH1 - CHB1
IDLE RATE Select
7:6 Reserved R/W 0x00 Set bits to 0.
5 IDLE auto 0: Allow IDLE_sel control in Bit 4
1: Automatic IDLE detect
4 IDLE select 0: Output is ON (SD is disabled)
1: Output is muted (electrical idle)
3:2 Reserved Set bits to 0.
1 RATE auto 0: Allow RATE_sel control in Bit 0
1: Automatic RATE detect
0 RATE select 0: 2.5 to 3.2 Gbps
1: 5.0 to 6.4 Gbps
0x16 CH1 - CHB1
EQ Control
7:6 Reserved R/W 0x20 Set bits to 0.
5:0 CH1 IB1 EQ IB1 EQ Control - total of 24 levels
(3 gain stages with 8 settings)
[5]: Enable EQ
[4:3]: Gain Stage Control
[2:0]: Boost Level Control
Pin [EQ0 EQ1] = Register [EN] [GST] [BST] =
Hex Value
FF = 100000 = 20'h = Bypass (Default)
11 = 101010 = 2A'h
00 = 110000 = 30'h
0F = 110001 = 31'h
01 = 111000 = 38'h
1F = 110100 = 34'h
10 = 110101 = 35'h
F0 = 111010 = 3A'h
F1 = 111100 = 3C'h
0x17 CH1 - CHB1
VOD Control
7:6 Reserved R 0x00 Set bit to 0.
5:0 CH1 OB1 VOD R/W 0x03 OB1 VOD Control
03'h = 600 mV (Default)
07'h = 800 mV
0F'h = 1000 mV
1F'h = 1200 mV
3F'h = 1400 mV
0x18 CH1 - CHB1
DE Control
7:0 CH1 OB1 DEM R/W 0x03 OB1 DEM Control
[7]: DEM TYPE (Compatibility = 0 / Enhanced
= 1)
[6:0]: DEM Level Control
Pin [DEM1 DEM0] = Register [TYPE] [Level
Control] = Hex Value
00 = 00000001 = 01'h = 0.0 dB
01 = 00111000 = 38'h = −3.5 dB
0F = 10001000 = 88'h = −6.0 dB
01 = 10010000 = 90'h = −9.0 dB
1F = 10100000 = A0'h = −12.0 dB
F0 = 10010000 = 90'h = −9.0 dB
F1 = 10100000 = A0'h = −12.0 dB
FF = 11000000 = C0'h = Reserved
0x19 CH1 - CHB1
IDLE Threshold
7:4 Reserved R/W 0x00 Set bits to 0.
3:0 IDLE threshold De-assert = [3:2], assert = [1:0]
00 = 110 mV, 70 mV (Default)
01 = 150 mV, 110 mV
10 = 170 mV, 130 mV
11 = 190 mV, 150 mV
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DS64BR401
Address Register Name Bit (s) Field Type Default Description
0x1C CH2 - CHB2
IDLE RATE Select
7:6 Reserved R/W 0x00 Set bits to 0.
5 IDLE auto 0: Allow IDLE_sel control in Bit 4
1: Automatic IDLE detect
4 IDLE select 0: Output is ON (SD is disabled)
1: Output is muted (electrical idle)
3:2 Reserved Set bits to 0.
1 RATE auto 0: Allow RATE_sel control in Bit 0
1: Automatic RATE detect
0 RATE select 0: 2.5 to 3.2 Gbps
1: 5.0 to 6.4 Gbps
0x1D CH2 - CHB2
EQ Control
7:6 Reserved R/W 0x20 Set bits to 0.
5:0 CH2 IB2 EQ IB2 EQ Control - total of 24 levels
(3 gain stages with 8 settings)
[5]: Enable EQ
[4:3]: Gain Stage Control
[2:0]: Boost Level Control
Pin [EQ0 EQ1] = Register [EN] [GST] [BST] =
Hex Value
FF = 100000 = 20'h = Bypass (Default)
11 = 101010 = 2A'h
00 = 110000 = 30'h
0F = 110001 = 31'h
01 = 111000 = 38'h
1F = 110100 = 34'h
10 = 110101 = 35'h
F0 = 111010 = 3A'h
F1 = 111100 = 3C'h
0x1E CH2 - CHB2
VOD Control
7:6 Reserved R 0x00 Set bit to 0.
5:0 CH2 OB2 VOD R/W 0x03 OB2 VOD Control
03'h = 600 mV (Default)
07'h = 800 mV
0F'h = 1000 mV
1F'h = 1200 mV
3F'h = 1400 mV
0x1F CH2 - CHB2
DE Control
7:0 CH2 OB2 DEM R/W 0x03 OB2 DEM Control
[7]: DEM TYPE (Compatibility = 0 / Enhanced
= 1)
[6:0]: DEM Level Control
Pin [DEM1 DEM0] = Register [TYPE] [Level
Control] = Hex Value
00 = 00000001 = 01'h = 0.0 dB
01 = 00111000 = 38'h = −3.5 dB
0F = 10001000 = 88'h = −6.0 dB
01 = 10010000 = 90'h = −9.0 dB
1F = 10100000 = A0'h = −12.0 dB
F0 = 10010000 = 90'h = −9.0 dB
F1 = 10100000 = A0'h = −12.0 dB
FF = 11000000 = C0'h = Reserved
0x20 CH2 - CHB2
IDLE Threshold
7:4 Reserved R/W 0x00 Set bits to 0.
3:0 IDLE threshold De-assert = [3:2], assert = [1:0]
00 = 110 mV, 70 mV (Default)
01 = 150 mV, 110 mV
10 = 170 mV, 130 mV
11 = 190 mV, 150 mV
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DS64BR401
Address Register Name Bit (s) Field Type Default Description
0x23 CH3 - CHB3
IDLE RATE Select
7:6 Reserved R/W 0x00 Set bits to 0.
5 IDLE auto 0: Allow IDLE_sel control in Bit 4
1: Automatic IDLE detect
4 IDLE select 0: Output is ON (SD is disabled)
1: Output is muted (electrical idle)
3:2 Reserved Set bits to 0.
1 RATE auto 0: Allow RATE_sel control in Bit 0
1: Automatic RATE detect
0 RATE select 0: 2.5 to 3.2 Gbps
1: 5.0 to 6.4 Gbps
0x24 CH3 - CHB3
EQ Control
7:6 Reserved R/W 0x20 Set bits to 0.
5:0 CH3 IB3 EQ IB3 EQ Control - total of 24 levels
(3 gain stages with 8 settings)
[5]: Enable EQ
[4:3]: Gain Stage Control
[2:0]: Boost Level Control
Pin [EQ0 EQ1] = Register [EN] [GST] [BST] =
Hex Value
FF = 100000 = 20'h = Bypass (Default)
11 = 101010 = 2A'h
00 = 110000 = 30'h
0F = 110001 = 31'h
01 = 111000 = 38'h
1F = 110100 = 34'h
10 = 110101 = 35'h
F0 = 111010 = 3A'h
F1 = 111100 = 3C'h
0x25 CH3 - CHB3
VOD Control
7:6 Reserved R 0x00 Set bit to 0.
5:0 CH3 OB3 VOD R/W 0x03 OB3 VOD Control
03'h = 600 mV (Default)
07'h = 800 mV
0F'h = 1000 mV
1F'h = 1200 mV
3F'h = 1400 mV
0x26 CH3 - CHB3
DE Control
7:0 CH3 OB3 DEM R/W 0x03 OB3 DEM Control
[7]: DEM TYPE (Compatibility = 0 / Enhanced
= 1)
[6:0]: DEM Level Control
Pin [DEM1 DEM0] = Register [TYPE] [Level
Control] = Hex Value
00 = 00000001 = 01'h = 0.0 dB
01 = 00111000 = 38'h = −3.5 dB
0F = 10001000 = 88'h = −6.0 dB
01 = 10010000 = 90'h = −9.0 dB
1F = 10100000 = A0'h = −12.0 dB
F0 = 10010000 = 90'h = −9.0 dB
F1 = 10100000 = A0'h = −12.0 dB
FF = 11000000 = C0'h = Reserved
0x27 CH3 - CHB3
IDLE Threshold
7:4 Reserved R/W 0x00 Set bits to 0.
3:0 IDLE threshold De-assert = [3:2], assert = [1:0]
00 = 110 mV, 70 mV (Default)
01 = 150 mV, 110 mV
10 = 170 mV, 130 mV
11 = 190 mV, 150 mV
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DS64BR401
Address Register Name Bit (s) Field Type Default Description
0x2B CH4 - CHA0
IDLE RATE Select
7:6 Reserved R/W 0x00 Set bits to 0.
5 IDLE auto 0: Allow IDLE_sel control in Bit 4
1: Automatic IDLE detect
4 IDLE select 0: Output is ON (SD is disabled)
1: Output is muted (electrical idle)
3:2 Reserved Set bits to 0.
1 RATE auto 0: Allow RATE_sel control in Bit 0
1: Automatic RATE detect
0 RATE select 0: 2.5 to 3.2 Gbps
1: 5.0 to 6.4 Gbps
0x2C CH4 - CHA0
EQ Control
7:6 Reserved R/W 0x20 Set bits to 0.
5:0 CH4 IA0 EQ IA0 EQ Control - total of 24 levels
(3 gain stages with 8 settings)
[5]: Enable EQ
[4:3]: Gain Stage Control
[2:0]: Boost Level Control
Pin [EQ0 EQ1] = Register [EN] [GST] [BST] =
Hex Value
FF = 100000 = 20'h = Bypass (Default)
11 = 101010 = 2A'h
00 = 110000 = 30'h
0F = 110001 = 31'h
01 = 111000 = 38'h
1F = 110100 = 34'h
10 = 110101 = 35'h
F0 = 111010 = 3A'h
F1 = 111100 = 3C'h
0x2D CH4 - CHA0
VOD Control
7:6 Reserved R 0x00 Set bit to 0.
5:0 CH4 OA0 VOD R/W 0x03 OA0 VOD Control
03'h = 600 mV (Default)
07'h = 800 mV
0F'h = 1000 mV
1F'h = 1200 mV
3F'h = 1400 mV
0x2E CH4 - CHA0
DE Control
7:0 CH4 OA0 DEM R/W 0x03 OA0 DEM Control
[7]: DEM TYPE (Compatibility = 0 / Enhanced
= 1)
[6:0]: DEM Level Control
Pin [DEM1 DEM0] = Register [TYPE] [Level
Control] = Hex Value
00 = 00000001 = 01'h = 0.0 dB
01 = 00111000 = 38'h = −3.5 dB
0F = 10001000 = 88'h = −6.0 dB
01 = 10010000 = 90'h = −9.0 dB
1F = 10100000 = A0'h = −12.0 dB
F0 = 10010000 = 90'h = −9.0 dB
F1 = 10100000 = A0'h = −12.0 dB
FF = 11000000 = C0'h = Reserved
0x2F CH4 - CHA0
IDLE Threshold
7:4 Reserved R/W 0x00 Set bits to 0.
3:0 IDLE threshold De-assert = [3:2], assert = [1:0]
00 = 110 mV, 70 mV (Default)
01 = 150 mV, 110 mV
10 = 170 mV, 130 mV
11 = 190 mV, 150 mV
23 www.national.com
DS64BR401
Address Register Name Bit (s) Field Type Default Description
0x32 CH5 - CHA1
IDLE RATE Select
7:6 Reserved R/W 0x00 Set bits to 0.
5 IDLE auto 0: Allow IDLE_sel control in Bit 4
1: Automatic IDLE detect
4 IDLE select 0: Output is ON (SD is disabled)
1: Output is muted (electrical idle)
3:2 Reserved Set bits to 0.
1 RATE auto 0: Allow RATE_sel control in Bit 0
1: Automatic RATE detect
0 RATE select 0: 2.5 to 3.2 Gbps
1: 5.0 to 6.4 Gbps
0x33 CH5 - CHA1
EQ Control
7:6 Reserved R/W 0x20 Set bits to 0.
5:0 CH5 IA1 EQ IA1 EQ Control - total of 24 levels
(3 gain stages with 8 settings)
[5]: Enable EQ
[4:3]: Gain Stage Control
[2:0]: Boost Level Control
Pin [EQ0 EQ1] = Register [EN] [GST] [BST] =
Hex Value
FF = 100000 = 20'h = Bypass (Default)
11 = 101010 = 2A'h
00 = 110000 = 30'h
0F = 110001 = 31'h
01 = 111000 = 38'h
1F = 110100 = 34'h
10 = 110101 = 35'h
F0 = 111010 = 3A'h
F1 = 111100 = 3C'h
0x34 CH5 - CHA1
VOD Control
7:6 Reserved R 0x00 Set bit to 0.
5:0 CH5 OA1 VOD R/W 0x03 OA1 VOD Control
03'h = 600 mV (Default)
07'h = 800 mV
0F'h = 1000 mV
1F'h = 1200 mV
3F'h = 1400 mV
0x35 CH5 - CHA1
DE Control
7:0 CH5 OA1 DEM R/W 0x03 OA1 DEM Control
[7]: DEM TYPE (Compatibility = 0 / Enhanced
= 1)
[6:0]: DEM Level Control
Pin [DEM1 DEM0] = Register [TYPE] [Level
Control] = Hex Value
00 = 00000001 = 01'h = 0.0 dB
01 = 00111000 = 38'h = −3.5 dB
0F = 10001000 = 88'h = −6.0 dB
01 = 10010000 = 90'h = −9.0 dB
1F = 10100000 = A0'h = −12.0 dB
F0 = 10010000 = 90'h = −9.0 dB
F1 = 10100000 = A0'h = −12.0 dB
FF = 11000000 = C0'h = Reserved
0x36 CH5 - CHA1
IDLE Threshold
7:4 Reserved R/W 0x00 Set bits to 0.
3:0 IDLE threshold De-assert = [3:2], assert = [1:0]
00 = 110 mV, 70 mV (Default)
01 = 150 mV, 110 mV
10 = 170 mV, 130 mV
11 = 190 mV, 150 mV
www.national.com 24
DS64BR401
Address Register Name Bit (s) Field Type Default Description
0x39 CH6 - CHA2
IDLE RATE Select
7:6 Reserved R/W 0x00 Set bits to 0.
5 IDLE auto 0: Allow IDLE_sel control in Bit 4
1: Automatic IDLE detect
4 IDLE select 0: Output is ON (SD is disabled)
1: Output is muted (electrical idle)
3:2 Reserved Set bits to 0.
1 RATE auto 0: Allow RATE_sel control in Bit 0
1: Automatic RATE detect
0 RATE select 0: 2.5 to 3.2 Gbps
1: 5.0 to 6.4 Gbps
0x3A CH6 - CHA2
EQ Control
7:6 Reserved R/W 0x20 Set bits to 0.
5:0 CH6 IA2 EQ IA2 EQ Control - total of 24 levels
(3 gain stages with 8 settings)
[5]: Enable EQ
[4:3]: Gain Stage Control
[2:0]: Boost Level Control
Pin [EQ0 EQ1] = Register [EN] [GST] [BST] =
Hex Value
FF = 100000 = 20'h = Bypass (Default)
11 = 101010 = 2A'h
00 = 110000 = 30'h
0F = 110001 = 31'h
01 = 111000 = 38'h
1F = 110100 = 34'h
10 = 110101 = 35'h
F0 = 111010 = 3A'h
F1 = 111100 = 3C'h
0x3B CH6 - CHA2
VOD Control
7:6 Reserved R 0x00 Set bit to 0.
5:0 CH6 OA2 VOD R/W 0x03 OA2 VOD Control
03'h = 600 mV (Default)
07'h = 800 mV
0F'h = 1000 mV
1F'h = 1200 mV
3F'h = 1400 mV
0x3C CH6 - CHA2
DE Control
7:0 CH6 OA2 DEM R/W 0x03 OA2 DEM Control
[7]: DEM TYPE (Compatibility = 0 / Enhanced
= 1)
[6:0]: DEM Level Control
Pin [DEM1 DEM0] = Register [TYPE] [Level
Control] = Hex Value
00 = 00000001 = 01'h = 0.0 dB
01 = 00111000 = 38'h = −3.5 dB
0F = 10001000 = 88'h = −6.0 dB
01 = 10010000 = 90'h = −9.0 dB
1F = 10100000 = A0'h = −12.0 dB
F0 = 10010000 = 90'h = −9.0 dB
F1 = 10100000 = A0'h = −12.0 dB
FF = 11000000 = C0'h = Reserved
0x3D CH6 - CHA2
IDLE Threshold
7:4 Reserved R/W 0x00 Set bits to 0.
3:0 IDLE threshold De-assert = [3:2], assert = [1:0]
00 = 110 mV, 70 mV (Default)
01 = 150 mV, 110 mV
10 = 170 mV, 130 mV
11 = 190 mV, 150 mV
25 www.national.com
DS64BR401
Address Register Name Bit (s) Field Type Default Description
0x40 CH7 - CHA3
IDLE RATE Select
7:6 Reserved R/W 0x00 Set bits to 0.
5 IDLE auto 0: Allow IDLE_sel control in Bit 4
1: Automatic IDLE detect
4 IDLE select 0: Output is ON (SD is disabled)
1: Output is muted (electrical idle)
3:2 Reserved Set bits to 0.
1 RATE auto 0: Allow RATE_sel control in Bit 0
1: Automatic RATE detect
0 RATE select 0: 2.5 to 3.2 Gbps
1: 5.0 to 6.4 Gbps
0x41 CH7 - CHA3
EQ Control
7:6 Reserved R/W 0x20 Set bits to 0.
5:0 CH7 IA3 EQ IA3 EQ Control - total of 24 levels
(3 gain stages with 8 settings)
[5]: Enable EQ
[4:3]: Gain Stage Control
[2:0]: Boost Level Control
Pin [EQ0 EQ1] = Register [EN] [GST] [BST] =
Hex Value
FF = 100000 = 20'h = Bypass (Default)
11 = 101010 = 2A'h
00 = 110000 = 30'h
0F = 110001 = 31'h
01 = 111000 = 38'h
1F = 110100 = 34'h
10 = 110101 = 35'h
F0 = 111010 = 3A'h
F1 = 111100 = 3C'h
0x42 CH7 - CHA3
VOD Control
7:6 Reserved R 0x00 Set bit to 0.
5:0 CH7 OA3 VOD R/W 0x03 OA3 VOD Control
03'h = 600 mV (Default)
07'h = 800 mV
0F'h = 1000 mV
1F'h = 1200 mV
3F'h = 1400 mV
0x43 CH7 - CHA3
DE Control
7:0 CH7 OA3 DEM R/W 0x03 OA3 DEM Control
[7]: DEM TYPE (Compatibility = 0 / Enhanced
= 1)
[6:0]: DEM Level Control
Pin [DEM1 DEM0] = Register [TYPE] [Level
Control] = Hex Value
00 = 00000001 = 01'h = 0.0 dB
01 = 00111000 = 38'h = −3.5 dB
0F = 10001000 = 88'h = −6.0 dB
01 = 10010000 = 90'h = −9.0 dB
1F = 10100000 = A0'h = −12.0 dB
F0 = 10010000 = 90'h = −9.0 dB
F1 = 10100000 = A0'h = −12.0 dB
FF = 11000000 = C0'h = Reserved
0x44 CH7 - CHA3
IDLE Threshold
7:4 Reserved R/W 0x00 Set bits to 0.
3:0 IDLE threshold De-assert = [3:2], assert = [1:0]
00 = 110 mV, 70 mV (Default)
01 = 150 mV, 110 mV
10 = 170 mV, 130 mV
11 = 190 mV, 150 mV
www.national.com 26
DS64BR401
Address Register Name Bit (s) Field Type Default Description
0x47 EN
Digital Test Point
IDLE Detect
7:6 Reserved R/W 0x02 Set bits to 0.
5 CH2, CH3 CH6, CH7 0: Disabled IDLE Test Point for CH2, 3, 6, 7.
1: Enable IDLE Test Point for CH2, 3, 6, 7.
4 CH0, CH1 CH4, CH5 0: Disabled IDLE Test Point for CH0, 1, 4, 5.
1: Enable IDLE Test Point for CH0, 1, 4, 5.
3:2 Reserved Set bits to 0.
Global VOD Adjust 1:0 VOD Adjust 00 = −25%
01 = −12.5%
10 = 0% (Default)
11 = +12.5%
0x4C EN
Digital Test Point
RATE Detect
7 CH2, CH3 CH6, CH7 R/W 0x00 0: Disabled RATE Test Point for CH2, 3, 6, 7.
1: Enable RATE Test Point for CH2, 3, 6, 7.
6 CH0, CH1 CH4, CH5 0: Disabled RATE Test Point for CH0, 1, 4, 5.
1: Enable RATE Test Point for CH0, 1, 4, 5.
5:0 Reserved Set bits to 0.
0x4E Digital Test 7:1 Reserved R/W 0x00 Set bits to 0.
0 Block AD[3:0] pins 1: Configure GPIO pin 46, 47, 53, 54 to be
outputs.
27 www.national.com
DS64BR401
Applications Information
GENERAL RECOMMENDATIONS
The DS64BR401 is a high performance circuit capable of de-
livering excellent performance. Careful attention must be paid
to the details associated with high-speed design as well as
providing a clean power supply. Refer to the LVDS Owner's
Manual for more detailed information on high speed design
tips to address signal integrity design issues.
PCB LAYOUT CONSIDERATIONS FOR DIFFERENTIAL
PAIRS
The CML inputs and LPDS outputs must have a controlled
differential impedance of 100Ω. It is preferable to route dif-
ferential lines exclusively on one layer of the board, particu-
larly for the input traces. The use of vias should be avoided if
possible. If vias must be used, they should be used sparingly
and must be placed symmetrically for each side of a given
differential pair. Route the differential signals away from other
signals and noise sources on the printed circuit board. See
AN-1187 for additional information on LLP packages.
The graphic shown below depicts a typical microstrip trace
routing design of the top and bottom layers. This should be
used as a reference to achieve the optimal system perfor-
mance. Impedance discontinuities at the differential via can
be minimized or eliminated by increasing the swell around
each via hole. To further improve the signal quality, a ground
via placed close to the signal via for a low inductance return
current path is recommended. When the via structure is as-
sociated with stripline trace and a thick board, further opti-
mization such as back drilling is often used to reduce the high
frequency effects of via stubs on the signal path. To minimize
cross-talk coupling, it is recommended to have >3X gap spac-
ing between the differential pairs. For example, if the trace
width is 5 mils with 5 mils spacing – 100Ω differential
impedance (closely coupled). The gap spacing between the
differential pairs should be >15 mils.
POWER SUPPLY BYPASSING
Two approaches are recommended to ensure that the
DS64BR401 is provided with an adequate power supply.
First, the supply (VDD) and ground (GND) pins should be
connected to power planes routed on adjacent layers of the
printed circuit board. The layer thickness of the dielectric
should be minimized so that the VDD and GND planes create
a low inductance supply with distributed capacitance. Sec-
ond, careful attention to supply bypassing through the proper
use of bypass capacitors is required. A 0.01 μF bypass ca-
pacitor should be connected to each VDD pin such that the
capacitor is placed as close as possible to the DS64BR401.
Smaller body size capacitors can help facilitate proper com-
ponent placement. Additionally, three capacitors with capac-
itance in the range of 2.2 μF to 10 μF should be incorporated
in the power supply bypassing design as well. These capac-
itors can be either tantalum or an ultra-low ESR ceramic.
30073002
FIGURE 7. Typical PCB Trace Routing
www.national.com 28
DS64BR401
Typical Performance Eye-Diagram Characteristics
30073096
FIGURE 8. Test Setup Connection Diagram
30073097
TP0: Input — After 5m 26–AWG Cable at 6 Gbps 30073098
TP1: Output — After 1m 28–AWG Cable at 6 Gbps
(EQ[1:0] = F0, DEM[1:0] = 01)
FIGURE 9.
30073099
TP0: Input — After 1m 28–AWG cable at 6 Gbps 30073001
TP1: Output — After 5m 26–AWG Cable at 6 Gbps
(EQ[1:0] = 11, DEM[1:0] = F0)
FIGURE 10.
29 www.national.com
DS64BR401
Physical Dimensions inches (millimeters) unless otherwise noted
54-pin LLP Package (5.5 mm x 10 mm x 0.8 mm, 0.5 mm pitch)
Order Number: DS64BR401SQ — Tape & Reel Supplied As 2,000 Units,
DS64BR401SQE — Tape & Reel Supplied As 250 Units
Package Number: SQA54A
www.national.com 30
DS64BR401
Notes
31 www.national.com
DS64BR401
Notes
DS64BR401 Quad Bi-Directional Repeater with Equalization and De-Emphasis
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