CT2566 - Aeroflex, Inc. - Datasheet.Live

eroflex Circuit Technology – Data Bus Modules For The Future © SCDCT2566 REV B 8/10/99

Features

•Second Source Compatible to the BUS-66300

•PGA Version available, (second source to the BUS-66312)

•Compatible with MIL-STD-1750 CPUs

•Compatible with MOTOROLA, INTEL, and ZILOG CPUs

•Compatible with Aeroflex’s CT2565 BC/RT/MT and CT2512 RT

•Minimizes CPU overhead

•Signal controls for shared memory implementation

•Transfers complete messages to shared memory

•Provides memory mapped 1553 interface

•Packaging – Hermetic Metal

• 78 Pin, 2.1" x 1.87" x .25" PGA type package

• 82 Lead, 2.2" x 1.61 x .18" Flat Package

Description

Aeroflex CT2566 MIL-STD-1553 to Microprocessor Interface Unit simplifies the CPU to 1553 Data

Bus interface. The CT2566 provides an interface by using RAM allowing the CPU to transmit or

receive 1553 traffic simply by accessing the memory. All 1553 message transfers are entirely

memory or I/O mapped. The CT2566 supports 1553 interface devices such as Aeroflex's CT2512

dual RT or the CT2565 dual BC, RT, and MT. The CT2566 operates over the full military -55°C to

+125°C temperature range.

Figure 1 – Functional Block Diagram

CT2566

MIL-STD-1553 to Microprocessor

CIRCUIT TECHNOLOGY

www.aeroflex.com

Interface Unit

ISO

9001

CLOCK IN

MSTRCLR

SELECT

STRBD

READYD

RD/

MEM/

REG

EXTEN

EXTLD

INT

IOEN

BUSREQ

BUSGRNT

BUSACK

MEMOE

MEMCS

MEMWR

ADRINC

NBGRNT

BCSTART

TAGEN

EOM

SOM

MSGERR

TIMEOUT

STATERR

LOOPERR

CHB/

CHA

CTLINB/

CTLOUTB/

RTU/

DBAC

SSBUSY

SSFLAG

SVCREQ

RESET

OPERATION

CONTROL

REGISTERS

CONFIGURATION

START / RESET

INTERRUPT

MASK

INTERRUPT

GENERATOR

BLOCK

STATUS

WORD

MICROCODE

CONTROLLER

CONTENTION

RESOLVER

MEMORY

TIMING

CPU

A15-A00

D15-D00

Aeroflex Circuit Technology SCDCT2566 REV B 8/10/99 Plainview NY (516) 694-6700

GENERAL

The CT2566 was designed to perform required

handshaking to the 1553 interface device, storing

or retrieving message(s) from a user supplied

RAM and notifying the CPU that a 1553

transaction has occurred. The CPU uses this

RAM to read the received data as well as to store

messages to be transmitted onto the Bus.

The CT2566 can be used to implement BC, RT,

or MT operation and can be either memory

mapped or I/O mapped to CPU address space.

Registers internal to the CT2566 control its

operation.

The CT2566 can access up to four external,

user supplied registers and can address up to

64K words of RAM. The RAM selected must be a

non-latched static RAM (capable of meeting the

timing constraints for the CT2566). A double

buffering architecture is provided to prevent

incomplete or partially updated information from

being transmitted onto the 1553 Data Bus.

The CT2566 requires an external, user supplied

clock.

COMPATIBLE MICROPROCESSOR TYPES

The CT2566 may be used with most common

microprocessors, including, the Motorola 68000

family, the Intel 8080 family, Zilog Z8000

products, and available MIL-STD-1750

processors.

Interfacing the CT2566 to the 1553 Data Bus

requires external circuitry such as Aeroflex’s

CT2565(BC/RT/MT) and ACT4489D

transceivers. Figure 2 shows the interconnection

for these components.

Specifications at Nominal Power Supply Voltages

PARAMETER VALUE UNITS

Logic

IIH (With VIH = 2.7V) −630 µA

IIL (With VIL = 0.0V) −700 µA

IOH 4.0 min mA

IOL 4.0 mA

VIH 2.0 V

VIL 0.8 V

VOH 3.7 V

VOL 0.4 V

Clock 12 MHz

Power Supplies

Voltage 5.0±10% V

Current Drain 10 typ mA

Temperature Range

Operating (Case) −55 to +125 °C

Storage −65 to +150 °C

Physical Characteristics

Size

78 pin DIP 2.1 x 1.87 x 0.25

(53 x 47.5 x 6.4)

(mm)

82 pin flatpack 2.1 x 1.87 x 0.25

(55.6 x 40.6 x 3.71)

(mm)

Weight

78 pin DIP 1 (28) oz (g)

82 pin flatpack 1 (28) oz (g)

Table 1 – Specifications

Aeroflex Circuit Technology SCDCT2566 REV B 8/10/99 Plainview NY (516) 694-6700

PIN NO. NAME I/O DESCRIPTION

1SELECT ISelect. When active, selects CT2566 for operation.

2RD/WR IRead/Write. Controls CPU bus data direction.

3READYD OReady Data. When active indicates data has been received

from, or is available to the CPU.

4EXTEN OExternal Enable. Output from CT2566 to enable output from

external devices. Same timing as MEMOE.

5TAGEN OTag Enable. Enables an external time tag counter for

transferring the time tag word into memory.

6EOM IEnd of Message. Input from 1553 device indicating end of

message.

7SOM IStart of Message. Input from 1553 device indicating start of

message in RTU mode.

8STATERR IStatus Error. Input from 1553 device when status word has

either a bit set or unexpected RT address (in BC mode only).

9ADRINC IAddress Increment. Sent from 1553 device to increment

address counter following word transfer.

10 MEM/REG IMemory/Register. Input from CPU to select memory or

11 CLOCK IN IClock input; 50% duty cycle, 12MHz, max.

12 LOOPERR ILoop Error. Input from 1553 device if short loop BIT fails.

13 BUSREQ IBus Request. When active, indicates 1553 device requires

use of the address/data bus.

14 BUSGRNT OBus Grant. Handshake output to 1553 device in response to

BUS REQUEST indicating address/data bus available to

1553 device.

15 Not Used --

16 MEMCS OMemory Chip Select. Low from CT2566 to enable external

RAM. Used with 4K x 4 RAM type device to read RAM or

used in conjunction with MEMWR to write data into RAM.

17 OE IOutput Enable. Input from 1553 device used to enable

memory on the parallel bus.

18 N/C -Not Used.

19 NBGRNT ILow pulse from 1553 device preceding start of received new

protocol sequence. Used with superseding command to reset

DMA in progress.

20 + 5 Volt ILogic power supply.

21 D15 I/O Data Bus Bit 15 (MSB).

22 D13 I/O Data Bus Bit 13.

23 D11 I/O Data Bus Bit 11.

24 D09 I/O Data Bus Bit 9.

25 D07 I/O Data Bus Bit 7.

26 D05 I/O Data Bus Bit 5.

27 D03 I/O Data Bus Bit 3.

Table 2 – Pin Functions (78 Pin DIP)

Aeroflex Circuit Technology SCDCT2566 REV B 8/10/99 Plainview NY (516) 694-6700

28 D01 I/O Data Bus Bit 1.

29 SSFLAG OSubsystem Flag. Output to 1553 device to set RT subsystem

flag status bit.

30 SSBUSY OSubsystem Busy. Output to 1553 device to set RT subsystem

busy flag.

31 RTU/BC OOutput to 1553 device used in conjunction with MT to set

operating mode.

32 A14 OAddress Bit 14.

33 A12 OAddress Bit 12.

34 A10 OAddress Bit 10.

35 A08 OAddress Bit 8.

36 A06 OAddress Bit 6.

37 A04 OAddress Bit 4.

38 A02 I/O Address Bit 2.

39 A00 I/O Address Bit 0 (LSB).

40 GND -Signal Return.

41 STRBD IStrobe Data. Used in conjunction with SELECT to indicate a

data transfer cycle to/from CPU.

42 IOEN OInput/Output Enable. Output from CT2566 to enable external

buffers/latches connecting the hybrid to the address/data

bus.

43 EXTLD OExternal Load. Used to load data into external device via the

CT2566 data bus. Same timing as MEMWR.

44 CHB/CHA Input from 1553 in RT mode used to indicate received 1553

message came in either Channel A or B.

45 INT OInterrupt. Interrupt pulse line to CPU.

46 BCSTART OBus Controller Start. Outputs to 1553 in initiate BC cycle.

47 RESET OReset. Output to external device from CT2566 consisting of

the OR condition of CPU reset and CPU Master Clear.

48 MSGERR IMessage Error. Input from 1553 device when an error occurs

in message sequence.

49 CTLIN B/AIInput to change active memory map area (0 = area A).

50 CTLOUT B/AOOutput from CT2566 selecting which area is to be active (0 =

area A).

51 TIMEOUT IInput from 1553 device indicating no response time-out.

52 MSTRCLR IMaster Clear. Power-on reset from CPU. Resets DMA in

progress and internal registers to logic “0”.

53 BUSACK IBus Acknowledge. Input from 1553 device acknowledge

receipt of BUSGRNT.

54 WR IWrite. Input from 1553 device for writing data into memory.

55 CS IChip Select. Input from 1553 device that is routed to

MEMCS.

PIN NO. NAME I/O DESCRIPTION

Table 2 – Pin Functions (78 Pin DIP) (Cont.)

Aeroflex Circuit Technology SCDCT2566 REV B 8/10/99 Plainview NY (516) 694-6700

56 MEMOE OMemory Output Enable. Output from CT2566 to enable

memory output data.

57 MEMWR OMemory Write. Output pulse from CT2566 to write data bus

data into memory.

58 Not Used - -

59 MT OBus Monitor. Used in conjunction with RTU/BC to set

operating mode.

60 D14 I/O Data Bus Bit 14.

61 D12 I/O Data Bus Bit 12.

62 D10 I/O Data Bus Bit 10.

63 D08 I/O Data Bus Bit 8.

64 D06 I/O Data Bus Bit 6.

65 D04 I/O Data Bus Bit 4.

66 D02 I/O Data Bus Bit 2.

67 D00 I/O Data Bus Bit 0 (LSB).

68 SVCREQ OService Request. Used to set service request bit in RT Status

Word.

69 DBAC ODynamic Bus Acceptance. Used to set status bit in RT Status

Word.

70 A15 OAddress Bit 15 (MSB).

71 A13 OAddress Bit 13.

72 A11 OAddress Bit 11.

73 A09 OAddress Bit 9.

74 A07 OAddress Bit 7.

75 A05 OAddress Bit 5.

76 A03 OAddress Bit 3.

77 A01 I/O Address Bit 1.

78 GND -Chassis Ground.

PIN NO. FUNCTION PIN NO. FUNCTION

1N/C 42 N/C

2SELECT 43 GROUND

3STRBD 44 CHASSIS GROUND

4RD/WR 45 A00 (LSB)

5IOENBL 46 A01

6READYD 47 A02

7EXTLD 48 A03

Table 3 – CT2566FP Pin Functions (82 Pin Flat Package)

PIN NO. NAME I/O DESCRIPTION

Table 2 – Pin Functions (78 Pin DIP) (Cont.)

Aeroflex Circuit Technology SCDCT2566 REV B 8/10/99 Plainview NY (516) 694-6700

8EXTEN 49 A04

9CHB/CHA 50 A05

10 TAGEN 51 A06

11 INT 52 A07

12 EOM 53 A08

13 BCSTART 54 A09

14 SOM 55 A10

15 RESET 56 A11

16 STATERR 57 A12

17 MSGERR 58 A13

18 ADRINC 59 A14

19 CTLIN B/A60 A15

20 MEM/REG 61 RTU/BC

21 CTLOUT B/A62 DBAC

22 CLOCK IN 63 SSBUSY

23 TIMEOUT 64 SVCREQ

24 LOOPERR 65 SSFLAG

25 MSTRCLR 66 D00

26 BUSYREQ 67 D01

27 BUSACK 68 D02

28 BUSGRNT 69 D03

29 WR 70 D04

30 N/C 71 D05

31 CS 72 D06

32 MEMCS 73 D07

33 MEMOE 74 D08

34 OE 75 D09

35 MEMWR 76 D10

36 Not Used 77 D11

37 N/C 78 D12

38 NBGRNT 79 D13

39 MT 80 D14

40 +5V 81 D15

41 N/C 82 N/C

PIN NO. FUNCTION PIN NO. FUNCTION

Table 3 – CT2566FP Pin Functions (82 Pin Flat Package) (Cont.)

Aeroflex Circuit Technology SCDCT2566 REV B 8/10/99 Plainview NY (516) 694-6700

MEMORY MANAGEMENT

The RAM used by the CT2566 can be any standard

static memory with a WRITE STROBE pulse width

requirement less than 70ns. The RAM area is broken

down into pointers, look-up tables, and data blocks. All

1553 operation control is accomplished through the

RAM, including fault monitoring and data block

transfers.

For most applications, a 4K x 16 memory is sufficient

to store the number of messages, but the CT2566 can

access up to 64K words.

DOUBLE BUFFERING

A Double Buffering system is available to prevent

partially updated data blocks from being read by the

CPU or transferred onto the 1553 Data Bus. To use

Double Buffering the CPU must divide the RAM into

two areas: “current” and “non-current”. Two Stack

Pointers, Descriptor Stacks, and Look-Up Tables are

required to be used by the CPU.

The 1553 device has access only to the current area

of RAM, and will use the current Descriptor Stack and

Look-Up Table. While the 1553 device is processing

messages using the current area pointers, the CPU

can be setting up the next set of messages in the

non-current area of RAM.

Once an EOM or BCEOM occurs, the CPU can swap

the current and non-current areas by toggling bit 13 of

the Configuration Register (See register section for

description). The 1553 device will then have access to

the new current area. Meanwhile, the CPU can begin

processing the data received during the previous

transfer or can begin setting up the next set of 1553

messages.

An external circuit (shown in Figure 3) can be added

to ensure that the swapping of the current and

non-current areas doesn’t occur while the CT2566 is

processing a message from the 1553 device. During

message processing, the INCMD is a logic "0" and the

CPU’s map area selection is inhibited. CTLIN B/A will

be automatically latched back into the CT2566 when

INCMD and NODT change to a logic "1".

DESCRIPTOR STACK

The CT2566 uses a Descriptor Stack in BC and RTU

modes. Each stack entry contains four words which

refer to one 1553 message (See Figure 4). The Block

Status Word, shown in Figure 5, indicates the physical

bus which received the message (RTU mode), reports

whether or not an error was detected during message

transfer, and indicates whether the message was

completed (SOM replaced with EOM).

The user-supplied Time-Tag word is loaded at the

start of a message transfer and is updated at the end of

the transfer.

The contents of the fourth word in the Descriptor

Stack depends on the operating mode. In BC mode, it

contains the address of the message data block

containing the 1553 message formatted as shown in

Figure 6. In RTU mode, the word contains the received

1553 Command Word as shown in Figure 7.

A Stack Pointer must be initialized by the CPU. The

Descriptor Stack contains 64, four word entries, and

automatically wraps around (the 64th entry is followed

by the first entry). The 1553 device uses the current

area Stack Pointer to determine the address of the

Stack entry to be used for the current 1553 message.

The CT2566 automatically increments the current area

Stack Pointer by four upon the completion of each

BUS-66300

Figure 3 – Synchronized map switching u

the CT2566

INCMD

NODT

12 MHz

50 CTLOUT B/A

49 CTLIN B/A

Notes:

(1) INCMD is from the BUS-65600 or BUS-65112.

(2) CTLOUT B/A reflects bit 13 of the Configuration Register.

(3) CTLIN B/A is used to select the current area.

LS74

BLOCK STATUS WORD

TIME TAG WORD

RESERVED

MESSABE BLOCK ADDRESS

BC DESCRIPTION BLOCK

BLOCK STATUS WORD

TIME TAG WORD

RESERVED

RECEIVED COMMAND WORD

RTU DESCRIPTION BLOCK

Figure 4 – Descriptor Stack Entries

Aeroflex Circuit Technology SCDCT2566 REV B 8/10/99 Plainview NY (516) 694-6700

message regardless of whether or not an error was

detected during the processing of that message.

LOOK-UP TABLES

In RTU mode a Look-Up Table is provided to allow

the CT2566 to store messages in distinct areas of RAM

based upon the subaddress of the received command

word. See RTU operation for details.

The CT2566 uses the T/R and the five subaddress

bits to form a pointer into the “current area” Look-Up

Table. The first 32 words of this table are initialized by

the user with the addresses of the data blocks to be

used for receiving data into subaddress 0,1,2,…31.

The next 32 words are initialized by the user with the

address of the data blocks to be used when

transmitting data from subaddress 0,1,2,…31.

CT2566 REGISTERS

The CT2566 is controlled through the use of three

internal registers: the Interrupt Mask Register,

Configuration Register, and Start/Reset Register. In

addition, the CT2566 can access up to four external,

user supplied registers. Possible external register

applications include: defining the RTU address, storing

a CPU Time Tag, and reading a captured Built-In-Test

(BIT) Word from the 1553 interface unit. For further

information, consult factory.

Table 2 – Internal Registers Address Definition

CT2566

Address Bits Definition

A2 A1 A0

000Interrupt Mask Register

001Configuration Register

010Not Used

011Start/Reset Register (write

only)

100External Register

101External Register

110External Register

1 1 1

External Register

15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0

1 1 1 1 1 1 1 1

SUBSYSTEM FLAG

SERVICE REQUEST

BUSY

DB ACCEPT

STOP ON ERROR

CONTROL AREA BIT B/A

RTU/BC

BIT DEFINITIONS

SUBSYSTEM FLAG 1553 status word bit.

SERVICE REQUEST 1553 status word bit.

BUSY 1553 status word bit.

DB ACCEPT 1553 status word bit.

STOP ON ERROR Causes BC to stop at the end of current data block if an error is detected.

CONTROL AREA B/AUsed for double buffering (See Double Buffering).

RTU/BC/MT Operating Mode.

Bit 15 Bit 14 Mode

0 0 BC

0 1 MT

1 0 RTU

1 1 ILLEGAL

Figure 8 – Configuration Register

Aeroflex Circuit Technology SCDCT2566 REV B 8/10/99 Plainview NY (516) 694-6700

15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0

1 1 1 1 1 1 1 1

LOOP TEST FAIL

RESPONSE TIME OUT (BC ONLY)

FORMAT ERROR

STATUS SET (BC ONLY)

ERROR FLAG

CHB/CHA (RTU ONLY)

SOM

EOM

Note: In BC mode Bit 13, CHB/CHA contains a logic "0" regardless of which channel is used.

Note: (1) User may opt to share memory block(s).

(2) See Figure 19.

Figure 5 – Block Status Word

Figure 6 – Use of Descriptor Stack – BC Mode

Note: User may opt to share memory block(s).

Figure 7 – Use of Descriptor Stack – RTU Mode

DESCRIPTOR

STACKS

STACK

POINTERS

CONFIGURATION

CURRENT

AREA B/

DATA

BLOCKS

DATA BLOCK

01315

BLOCK STATUS WORD

RESERVED

TIME TAG WORD

MESSAGE

BLOCK ADDR

DESCRIPTOR

STACKS

STACK

POINTERS

CONFIGURATION

CURRENT

AREA B/

DATA

BLOCKS

DATA BLOCK

01315

LOOK-UP TABLE

(DATA BLOCK ADDR)

LOOK-UP

TABLE ADDR

(2)

(1)

BLOCK STATUS WORD

RESERVED

TIME TAG WORD

RECEIVED COMMAND

WORD

Aeroflex Circuit Technology SCDCT2566 REV B 8/10/99 Plainview NY (516) 694-6700

INTERRUPT MASK REGISTER

This register is an eight bit read/write register used to enable the interrupt conditions. All interrupts are enabled

with a logic "1" (See Figure 9).

START/RESET REGISTER

Only two bits of this write only register are used, as illustrated in Figure 10.

15 4 3 2 1 0

1111111

NOT USED

BC EOM

FORMAT ERROR/STATUS SET

NOT USED

EOM

INTERRUPT DEFINITION

EOM End of Message. Set by CT2566 (during BC or RTU mode) every time a

1553 message is transferred (regardless of validity).

FORMAT ERROR/ Set by CT2566 for these conditions:

STATUS SET Loop Test Failure: Last transmitted word did not match received word.

Message Error: Received message contained an address error, one of

eight 1553 status bits set, or 1553 specification violated (parity error,

Manchester error, etc).

Time-Out: Expected transmission was not received during allotted time

Status Set: Received status word contained status bit(s) set or address

error.

BC EOM Bus Controller End of Message. Set by CT2566 (in BC mode) when all

messages have been transferred.

Figure 9 – Interrupt Mask Register

15 1 0

NOT USED

CONTROLLER START

RESET

BIT DEFINITION

RESET Issued by the CPU to place the CT2566 in the power-on condition;

Configuration, and Interrupt Mask registers are reset to logic “0”.

CONTROLLER START Issued by the CPU (BC mode) to start message transmission. The CPU

must first load the number of messages to transfer (256, max) in the

message count location of RAM (area A or B). Value is loaded in 1’s

complement (load FFFE to transmit one message). In MT mode it is

used to begin reception of 1553 messages. Issued by CPU in MT mode

to enable monitor operation.

Figure 10 – Start/Reset Register

Aeroflex Circuit Technology SCDCT2566 REV B 8/10/99 Plainview NY (516) 694-6700

BC Operation

The BC mode is selected by setting the two MSBs of

the Configuration Register to logic "0". This can be done

by writing directly to the register or by issuing a

MSTRCLR or RESET command. Note that a RESET

will also clear the Interrupt Mask Register.

BC Initialization.

For BC operation, the user initializes the RAM as

shown in Table 3 and follows the steps in Figure 11, BC

Initialization. The CPU loads the data blocks with 1553

messages (See Figure 12). The first word of each data

block must contain the Control Word (shown in Figure

13) for the message. The starting addresses of the data

blocks are placed in the fourth word of the Descriptor

Stack in the order the messages are to be transmitted

(i.e. the address of the first message is loaded into the

fourth location of the Stack, the address of the second

message is placed into the eighth location, etc). Once

the data blocks and the Descriptor Stack have been

initialized, the CPU loads the current area message

count with the number of messages to transfer (load in

1’s complement).

Table 3 - Typical BC Memory Map

(4K memory)]

HEX ADDRESS FUNCTION

Fixed Areas

0100 Stack Pointer A

0101 Message Count A

0104 Stack Pointer B

0105 Message Count B

User Defined Areas

0108-013F Not Used

0140-017F Data Block 1

0180-01BF Data Block 2

01C0-01FF Data Block 3

• •

0F00-0FFF Descriptor Stack A

0000-00FF Descriptor Stack B

CONTROL

WORD CONTROL

WORD

RECEIVE

COMMAND TRANSMIT

COMMAND RECEIVE

COMMAND MODE

COMMAND

TRANSMIT

COMMAND

BROADCAST

COMMAND

CONTROL

WORD

MODE

COMMAND MODE

COMMAND DATA WORD

DATA WORD

LAST

STATUS

WORD

STATUS

WORD

STATUS

WORD

DATA WORD

LAST

DATA WORD

LAST

STATUS

RECEIVE

DATA WORD

1 RECEIVED

DATA WORD

2 RECEIVED

DATA WORD

RECEIVED

STATUS

RECEIVED

STATUS

WORD 1

FROM XMTR

STATUS

WORD 2

RECEIVER

FROM

TERMINAL TO

TERMINAL

LAST DATA

WORD

RECEIVED

DATA WORD

LOOPED

CT2565

BACK BY

REMOTE

DATA BLOCK

COMMAND

BACK BY

TRANSMIT

LOOPED

CT2565

COMMAND

BACK BY

BROADCAST

LOOPED

CT2565

COMMAND

BACK BY

MODE

LOOPED

CT2565

COMMAND

BACK BY

MODE

LOOPED

CT2565

DATA WORD

BACK BY

LOOPED

CT2565

LAST

BACK BY

DATA WORD

LOOPED

CT2566

TRANSMIT

DATA BLOCK

RECEIVE

DATA BLOCK

WITH DATA

DATA BLOCK

MODE CODE

TRANSMIT

FORMAT

COMMAND

BACK BY

TRANSMIT

LOOPED

CT2565

WITH DATA

DATA BLOCK

MODE CODE

RECEIVE

FORMAT

MODE CODE

WITHOUT

DATA

BROADCAST

COMMAND

WITH DATA

BROADCAST

COMMAND

(NO DATA)

BROADCAST

COMMAND

(NO DATA)

Figure 12 – BC Message Data Block Formats

Aeroflex Circuit Technology SCDCT2566 REV B 8/10/99 Plainview NY (516) 694-6700

The CPU selects an internal register by asserting

MEM/REG and the A2 bit to logic "0" (See Table 2).

External registers are selected by asserting MEM/REG

logic "0" and A2 bit to a logic "1". The signals EXTEN

and EXTLD are used to read and write from the

external registers (See Figures 26 to 28).

Configuration Register

The Configuration Register is an eight bit read/write

MT, or RTU) and the associated RTU status bits. The

four MSBs define the mode of operation; the four LSBs

define the RTU status bits (See Figure 8).

All bits in the Configuration Register (except bit 12)

will be present on the respective CT2566 output pins to

the 1553 device. The MT bit is inverted at the output.

To begin transferring messages onto the bus, the

CPU must issue a Controller Start Command (See

Figure 14). This is done by setting bit 1 of the

Start/Reset Register to a logic "1". An EOM interrupt

will be generated each time a message transfer has

been completed. A BCEOM will be generated once the

specified number of messages has been transferred

(message counter = FFFF).

A Format Error Status Set Interrupt will be generated

at the end of a message if a timeout condition or error

condition was detected. If the STOP ON ERROR bit in

the Configuration Register is set, the CT2566 will stop

bus transactions until a new Controller Start command

is issued by the CPU. These interrupts may be masked

by the CPU through the Interrupt Mask Register.

BC START SEQUENCE

After setting the CONTROLLER START bit in the

Start/Reset Register, the CT2566 takes the following

actions:

1. Reads the Stack Pointer to get the address of the

current Descriptor Stack Entry.

2. Stores an SOM flag in the Block Status Word to

indicate a transfer operation is in progress.

3. Stores the Time Tag if used.

4. Reads the Data Block Address from the fourth

location of the Descriptor Stack and transfers the

Data Block Address into an internal Address

5. Issues a BCSTART pulse to the associated 1553

device to start the message transfers.

Note that data words are transferred to an from

memory by the associated 1553 interface unit using the

internal Address Register.

BC EOM Sequence.

Upon completion of a 1553 message (valid or invalid)

the 1553 interface unit issues an EOM pulse to the

CT2566 which takes the following actions:

1. Reads the Stack Pointer to get the address of the

current Descriptor Stack Entry.

15 8 7 0

NOT USED

BUS CHANNEL A/B

NOT USED

MASK BROADCAST BIT

NOT USED

MODE CODE

BROADCAST

RTU TO RTU

Note: When the BC expects the BROADCAST bit set in the status

word, a logic "1" will mask the status interrupt error flag. A

FORMAT error will be generated if the MASK BROADCAST bit

is not set.

ISSUE RESET COMMAND

INITIALIZE STACK POINTER

LOAD MESSAGE COUNTER

LOAD MESSAGES

ISSUE START COMMAND

SET CONFIGURATION

RESISTER TO BC MODE

INITIALIZE INTERRUPT

MASK REGISTER

LOAD EVERY FOURTH

LOCATION OF STACK WITH

STARTING ADDRESS

START

Figure 11

BC Initialization (under user control)

Figure 13 – BC Control Word

Aeroflex Circuit Technology SCDCT2566 REV B 8/10/99 Plainview NY (516) 694-6700

CONTROLLER START

COMMAND RECEIVED

READS STACK POINTER

LOAD BLOCK STATUS WORD

INTO FIRST WORD OF

DESCRIPTOR STACK ENTRY

(SET SOM BIT IN BLOCK

STATUS WORD)

LOAD TIME TAG INTO

SECOND WORD OF

DESCRIPTOR

STACK ENTRY

ADDRESS FROM FOURTH WORD

OBTAIN DATA BLOCK

ISSUE BC START TO 1553 DEVICE

DETERMINE TYPE OF TRANSFER

READ CONTROL WORD TO

UPDATE BLOCK STATUS WORD

UPDATE TIME TAG

INCREMENT STACK

POINTER BY FOUR.

DECREMENT

MESSAGE COUNT

TRANSFERRED OK

DATA BLOCK

TRANSFERRED OK

STOP ON

ERROR SET

YES

MORE MESSAGES

TO SEND

YES

ISSUE BC EOM

STOP

Figure 14 – BC Sequence of Operation (Under CT2566 Control)

TRANSFER DATA TO/FROM

1553 BUS (NOTE: RAM NOW

CONTROLLED BY INPUT PINS

CS AND OE

After controller start is issued the subsystem must wait until BCEOM is active

before issuing the next controller start.

Aeroflex Circuit Technology SCDCT2566 REV B 8/10/99 Plainview NY (516) 694-6700

2. Updates the Block Status Word by resetting the

SOM and setting EOM and any error bits.

3. Updates the Time Tag if used.

4. Increments the contents of the Stack Pointer by

four and increments the Message Counter by

one.

5. Initiates a message transfer beginning with new

Controller Start sequence if more messages are

to be transmitted.

6. Generates a BCEOM interrupt if enabled and no

further messages are to be transmitted.

Note that if an error is received and STOP ON

ERROR is set, the CT2566 completes the current

BCEOM sequence and then stops. The Stack Pointer

will point to the next message to be transmitted.

RTU Operation

The RTU mode is selected by setting bit 15 of the

Configuration Register to logic "1" and bit 14 to

logic"0".

RTU Initialization

For RTU operation, the user initializes the RAM as

shown in Table 4 and follows the steps shown in Figure

15, RTU Initialization Chart.

Look-Up Tables

The first 32 words of the Look-Up Table are initialized

with the addresses of the data blocks to be used when

received data from subaddress 0, 1, 2,…31. The next

32 table locations should be initialized with the address

of the data blocks to be used when the RTU is

instructed to transmit data from subaddress 0, 1,

2,…31. The data blocks may be any length sufficient to

contain the particular message as long as the data

block does not cross a 256 word boundary. Data blocks

may be shared by Look-Up Tables A and B, if desired

by the user (See Figure 16). The 1553 device can only

access the current Look-Up Table and the current

Descriptor Stack. The CPU selects the current area

through bit 13 of the Configuration Register.

Once in the RTU mode, the CT2566 will store the

command word in the fourth location of the current area

Descriptor Stack. The status of the message will be

recorded in the first location of the stack.

The data associated with the message will be

transferred to/from the data block indicated by the

Look-Up Table entry for that subaddress. If a system

Time Tag is provided by the user the CT2566 will

record the time of the SOM sequence in the second

word of the Stack entry.

When the CT2566 received an EOM pulse from the

1553 device, it resets the SOM bit in the Block Status

Word and sets the EOM bit and any error bits as

necessary. The Time Tag entry will be updated and an

EOM interrupt will be generated by the CPU, if enabled.

RTU SOM Sequence

Initiated when 1553 terminal puts a 1553 command

word on D00-D15 and pulses SOM low. The CT2566

saves the command received in an internal register.

Figure 17 illustrates the RTU Sequence of Operation

once a 1553 command word is received. Once the

command word is received, the CT2566 performs the

following steps:

1. Reads the Stack Pointer to get the address of the

current Descriptor Stack Entry.

2. Stores a SOM flag in the Block Status Word to

indicate a transfer operation is in progress.

3. Stores the Time Tag if used.

Table 4 – Typical RTU memory map (4K memory)

HEX ADDRESS FUNCTION

Fixed Areas

0100 Descriptor Stack Pointer A

0101 Reserved

0104 Descriptor Stack Pointer B

0105 Reserved

0108-013F Spare

0140-017F Look-Up Table A

01C0-01FF Look-Up Table B

User Defined Areas

0180-019F Data Block 1

01A0-01BF Data Block 2

0200-021F Data Block 3

0220-023F Data Block 4

0240-025F Data Block 5

0260-027F Data Block 6

• •

0EE0-0EFF Data Block 107

0000-00FF Descriptor Stack A

0F00-0FFF Descriptor Stack B

15 8 7 6 5 4 0

00000000 1

CURRENT AREA B/A

(CONFIG. REG BIT 13)

TR (FROM COMMAND

WORD)

RTU SUBADDRESS BITS

(FROM COMMAND WORD)

RTU LOOK-UP TABLE ADDRESS

Aeroflex Circuit Technology SCDCT2566 REV B 8/10/99 Plainview NY (516) 694-6700

4. Stores the Command Word received.

5. Reads a Block address from the Look-Up Table

using the T/R bit and the subaddress from the

Command Word; transfers the Block address into

the address register. Data words are transferred

to/from memory by the associated 1553 interface

unit using the address register.

RTU EOM Sequence

At the end of a 1553 message (valid or invalid) the

CT2566 received an EOM pulse and then performs the

following:

1. Updates the Block Status Word.

2. Updates the Time Stage if used.

3. Increments the Stack Pointer by four.

4. Generates an Error Interrupt if enabled.

Figure 17 – RTU Sequence of Operation

(under CT2566 control)

MESSAGE COMPLETE

GENERATE EOM INTERRUPT AND

CONDITION DETECTED

ERROR INTERRUPT IF ERROR

INCREMENT STACK POINTER

BY FOUR

UPDATE BLOCK STATUS WORD

AND TIME TAG

TRANSFER DATA TO/FROM

1553 INTERFACE DEVICE

READ LOOK-UP TABLE USING

AREA BIT B/A

T/R SUBADDRESS CURRENT

UPDATE DESCRIPTOR STACK

TAG AND COMMAND WORD

BLOCK STATUS WORD, TIME

READ STACK POINTER

1553 COMMAND WORD

RECEIVED

EXIT

YES RECEIVED COMMAND WORD LOOK-UP TABLE

RTU

ADDR T/RSUBADD

WORD

COUNT

XXXXX 000000 XXXXX USER DEFINED 0140

LOCATIONS

USER DEFINEDXXXXX 000001 XXXXX 0141

USER DEFINED

XXXXX 000010 XXXXX 0142

XXXXX 111110 XXXXX USER DEFINED 017E

USER DEFINED

XXXXX 111111 XXXXX 017F

}

Figure 16 – RTU Look-up Table

START

ISSUE RESET COMMAND

INITIALIZE STACK POINTER

SET UP DATA BLOCKS

WAIT FOR 1553 COMMAND

SET UP LOOK-UP TABLE(S)

DATA BLOCK ASSIGNMENTS

Figure 15

RTU Initialization (under user control)

INITIALIZE INTERRUPT

MASK REGISTER

SET CONFIGURATION

Aeroflex Circuit Technology SCDCT2566 REV B 8/10/99 Plainview NY (516) 694-6700

MT Operation

The MT mode is selected by setting bit 15 of the

Configuration Register to logic "0" and bit 14 to a

logic"1" along with issuing a Controller Start

Command.

MT Initialization

For MT operations, the entire RAM is used as the MT

Stack (See Table 5) and the setups shown in Figure 18

are followed. The user instructs the CT2566 where to

store the first received 1553 word by loading the

starting word address in the Stack Pointer. Once a

Controller Start command is issued, the CT2566 will

store this value in the internal Address Register.

The identification Word provides the CPU with

additional information regarding the received 1553

word, its format is shown in Figure 19. This information

allows the user to develop algorithms to restructure the

message transfers. External Logic can be used for

triggering on specific commands or subaddresses. For

further information, consult factory.

The 1553 device will generate an Identification Word

for every word that is transferred across the 1553 Data

Bus. The CT2566 stores the received 1553 word in the

RAM location indicated by the internal Address

by one so that it points to the next word in RAM, and

the Identification Word is stored at that location. The

internal Address Register is then incremented by one

again, in preparation for storing the next Identification

Word. The RAM automatically wraps around (from

location FFFF to location 0000), shown in Figure 20.

Bit 7 of the Identification Word can be reset by the

CPU each time it reads the associated data word into

CPU memory. This provides a simple method of

keeping track of words that have been processed by

the CPU.

START

ISSUE RESET COMMAND

CLEAR RAM

INITIALIZE STACK POINTER

SET CONFIGURATION REGISTER

TO MT MODE

ISSUE START COMMAND

Figure 18 – MT Initialize

(under user control)

15 8 7 0

1 1 1 1

GAP TIME

SET TO "1"

ERROR (1 = ERROR, 0 = GOOD STATUS)

COMMAND SYNC

1553 CHANNEL A/B

WORD GAP

SET TO "0"

Note: Each bit of the GAP TIME field

represents .5µs.

Figure 19 – MT Identification Word

GET STACK POINTER FROM

WORD 100 IN RAM AND

STORE IN INTERNAL REGISTER

START COMMAND ISSUED

STORE RETREIVED 1553 WORD

IN RAM, INCREMENTS INTERNAL

ADDRESS REGISTER

Figure 20 – MT Sequence of Operation

(under CT2566 control)

STORE IDENTIFICATION WORD

IN RAM, INCREMENT INTERNAL

ADDRESS REGISTER

WORD TRANSFERRED

ACROSS 1553 BUS

YES

Aeroflex Circuit Technology SCDCT2566 REV B 8/10/99 Plainview NY (516) 694-6700

CT2566 Timing Clock in at 12 MHz

Figures 21 through 37 illustrate the timing for the CT2566 and its operation. All timing definitions are listed in the

tables below and the appropriate definitions are repeated with each diagram.

Table 5 – Typical MT memory map (4K memory)

HEX ADDRESS FUNCTION

0000 First Received 1553 Word

MODE CODES

All mode codes applicable to dual redundant

systems are recognized by the CT2566. Mode

codes can be illegalized by the 1553 BC or

RTU device. Refer to the CT2565 or CT2512

data sheets for more information.

0001 First Identification Word

0002 Second Received 1553 Word

0003 Second Identification Word

0004 •

0005 •

0006 •

0007 •

0008 •

• •

0100 Stack Pointer A (Fixed location)*

0104 Stack Pointer B

• •

FFFF Word stored at FFFF will be followed by

the word stored at 0000.

* The Stack Pointer is loaded into an internal Address

location is overwritten by data once monitor operation

begins.

Delay Timing

SYMBOL DESCRIPTION MIN MAX UNITS

td1 READYD low delay (CPU Handshake) -200 ns

td2 IOEN high delay (CPU Handshake) -20 ns

td3 CPU MEMWR low delay -120 ns

td4 CPU MEMOE low delay -115 ns

td5 EXTLD low delay -130 ns

td6 RESET low delay -30 ns

td7 Internal Register delay (read) -60 ns

td8 Internal Register delay (write) -60 ns

td9 Register Data/Address set-up time -40 ns

td10 Register Data/Address hold time -0ns

Aeroflex Circuit Technology SCDCT2566 REV B 8/10/99 Plainview NY (516) 694-6700

td11 BC SOM Cycle DMA delay -120 ns

td12 INT low delay -50 ns

td13 RTU SOM Cycle DMA delay -200 ns

td14 1553 Command Word set-up time 60 -ns

td15 1553 Command Word hold time 60 -ns

td16 MT SOM Cycle DMA delay -120 ns

td17 CS low to MEMCS low delay -30 ns

td18 OE low to MEMOE low delay -30 ns

td19 WR low to MEMWR low delay -30 ns

td20 BUSGRNT high delay -25 ns

td21 BUSACK low Address delay -45 ns

td22 BUSACK high Address delay -25 ns

td23 Address increment delay -200 ns

Pulse Width Timing

SYMBOL DESCRIPTION MIN MAX UNITS

tpw1 READYD pulse width (CPU Handshake) 70 -ns

tpw2 CPU MEMWR low pulse width 70 -ns

tpw3 CPU MEMCS low pulse width 70 -ns

tpw4 EXTLD low pulse width 70 -ns

tpw5 RESET low pulse width 70 -ns

tpw6 DMA MEMWR low pulse width 70 -ns

tpw7 DMA MEMCS low pulse width 70 -ns

tpw8 BCSTART low pulse width 70 -ns

tpw9 EOM low pulse width 50 200 ns

tpw10 INT low pulse width *tpw9 ns

tpw11 INT low (BCEOM) pulse width 60 -ns

tpw12 SOM low pulse width 50 200 ns

tpw13 NBGRNT low pulse width 50 200 ns

tpw14 ADRINC low pulse width 50 200 ns

tpw15 MSTRCLR low pulse width 150 -ns

*The min value of tpw10 equals tpw9 minus 30 ns.

Delay Timing (Cont.)

SYMBOL DESCRIPTION MIN MAX UNITS

Aeroflex Circuit Technology SCDCT2566 REV B 8/10/99 Plainview NY (516) 694-6700

A02 (38)

A01 (77)

A00 (39)

SSFLAG, SSBUSY, SVCRQST

DBAC, RTU/BC, MT, CTLINB/A

MEM/REG (10)

D15-D00

IOEN (42)

SELECT (1)

STRBD (41)

(Internal)

12MHz Clock

RD/WR (2)

READYD (3)

See Note

DATA VALID

td1

tpw1

td2

td7

Figure 21 – CPU reads from internal register

NOTE: STRBD to IOEN (low) delay is two clock cycles. If contention occurs, delay is two clock cycles following release of bus.

CPU Reads from Internal Register

SYMBOL DESCRIPTION MIN MAX UNITS

td1 READYD low delay (CPU Handshake) -200 ns

td2 IOEN high delay (CPU Handshake) -20 ns

tpw1 READYD pulse width (CPU Handshake) 70 -ns

td7 Internal Register delay (read) -60 ns

Aeroflex Circuit Technology SCDCT2566 REV B 8/10/99 Plainview NY (516) 694-6700

A02 (38)

A01 (77)

A00 (39)

SSFLAG, SSBUSY, SVCRQST

DBAC, RTU/BC, MT, CTLINB/A

MEM/REG (10)

D15-D00

IOEN (42)

SELECT (1)

STRBD (41)

(Internal)

12MHz Clock

RD/WR (2)

READYD (3)

See Note

td1

td2

td9

tpw1

td8

td10

DATA LATCHED

Configuration Register Only

DATA VALID

Figure 22 – CPU writes to internal register

NOTE: STRBD to IOEN (low) delay is two clock cycles. If contention occurs, delay is two clock cycles following release of bus.

CPU Writes to Internal Register

SYMBOL DESCRIPTION MIN MAX UNITS

td1 READYD low delay (CPU Handshake) -200 ns

td2 IOEN high delay (CPU Handshake) -20 ns

tpw1 READYD pulse width (CPU Handshake) 70 -ns

td8 Internal Register delay (write) -60 ns

td9 Register Data/Address set-up time -40 ns

td10 Register Data/Address hold time -0ns

Aeroflex Circuit Technology SCDCT2566 REV B 8/10/99 Plainview NY (516) 694-6700

A02 (38)

A01 (77)

A00 (39)

MEM/REG (10)

D15-D00

IOEN (42)

SELECT (1)

STRBD (41)

(Internal)

12MHz Clock

RD/WR (2)

READYD (3)

See Note

td1

td9

tpw1

DATA FROM EXTERNAL REGISTER

EXTEN (4)

td2

Figure 23 – CPU reads from external register

NOTE: STRBD to IOEN (low) delay is two clock cycles. If contention occurs, delay is two clock cycles following release of bus.

CPU Reads from External Register Timing

SYMBOL DESCRIPTION MIN MAX UNITS

td1 READYD low delay (CPU Handshake) -200 ns

td2 IOEN high delay (CPU Handshake) -20 ns

tpw1 READYD pulse width (CPU Handshake) 70 -ns

td9 Register Data/Address set-up time -40 ns

Aeroflex Circuit Technology SCDCT2566 REV B 8/10/99 Plainview NY (516) 694-6700

A02 (38)

A01 (77)

A00 (39)

MEM/REG (10)

D15-D00

IOEN (42)

SELECT (1)

STRBD (41)

(Internal)

12MHz Clock

RD/WR (2)

READYD (3)

See Note

td1

td9

tpw1

CPU DATA

EXTLD (43)

td10

VALID

tpw4

td5

td2

Figure 24 – CPU writes to external register

NOTE: STRBD to IOEN (low) delay is two clock cycles. If contention occurs, delay is two clock cycles following release of bus.

CPU Writes to External Register

SYMBOL DESCRIPTION MIN MAX UNITS

td1 READYD low delay (CPU Handshake) -200 ns

td2 IOEN high delay (CPU Handshake) -20 ns

tpw1 READYD pulse width (CPU Handshake) 70 -ns

td5 EXTLD low delay -130 ns

td9 Register Data/Address set-up time -40 ns

td10 Register Data/Address set-up time -0ns

tpw4 EXTLD low pulse width 70 -ns

Aeroflex Circuit Technology SCDCT2566 REV B 8/10/99 Plainview NY (516) 694-6700

MEMOE (56)

MEM/REG (10)

A15-A00

IOEN (42)

SELECT (1)

STRBD (41)

(Internal)

12MHz Clock

RD/WR (2)

READYD (3)

See Note

td1

tpw1

D15-D00

td2

RAM ADDRESS VALID

td4

RAM DATA VALID

MEMCS (16)

Figure 25 – CPU reads from RAM

NOTE: STRBD to IOEN (low) delay is two clock cycles. If contention occurs, delay is two clock cycles following release of bus.

CPU Reads from Ram

SYMBOL DESCRIPTION MIN MAX UNITS

td1 READYD low delay (CPU Handshake) -200 ns

td2 IOEN high delay (CPU Handshake) -20 ns

tpw1 READYD pulse width (CPU Handshake) 70 -ns

td9 CPU MEMOE low delay -115 ns

Aeroflex Circuit Technology SCDCT2566 REV B 8/10/99 Plainview NY (516) 694-6700

MEMWR (57)

MEM/REG (10)

A15-A00

IOEN (42)

SELECT (1)

STRBD (41)

(Internal)

12MHz Clock

RD/WR (2)

READYD (3)

See Note

td1

tpw1

D15-D00

td2

RAM ADDRESS VALID

td3

RAM DATA VALID

MEMCS (16)

tpw2

tpw3

Figure 26 – CPU writes to RAM

NOTE: STRBD to IOEN (low) delay is two clock cycles. If contention occurs, delay is two clock cycles following release of bus.

CPU Writes To Ram

SYMBOL DESCRIPTION MIN MAX UNITS

td1 READYD low delay (CPU Handshake) -200 ns

td2 IOEN high delay (CPU Handshake) -20 ns

tpw1 READYD pulse width (CPU Handshake) 70 -ns

td3 CPU MEMWR low delay -120 ns

tpw2 CPU MEMWR low pulse width 70 -ns

tpw3 CPU MEMCS low pulse width 70 -ns

Aeroflex Circuit Technology SCDCT2566 REV B 8/10/99 Plainview NY (516) 694-6700

td2

BUSGRNT

(14)

td22

td20

A15-A00

BUSACK

(53)

BUSREQ

(13)

(55)

MEMCS

(16)

(17)

MEMOE

(56)

(54)

MEMWR

(57)

td18

td19

td17

Figure 27 – MIL-STD-1553 to CT2566 Handshaking

Figure 28 – MIL-STD-1553 terminal I/O delay

MIL-STD-1553 TO CT2566 Handshaking

SYMBOL DESCRIPTION MIN MAX UNITS

td20 BUSGRNT high delay -25 ns

td21 BUSACK low Address delay -45 ns

td22 BUSACK high Address delay -25 ns

MIL-STD-1553 Terminal to Delay

SYMBOL DESCRIPTION MIN MAX UNITS

td17 CS low to MEMCS low delay -30 ns

td18 OE low to MEMOE low delay -30 ns

td19 WR low to MEMWR low delay -30 ns

Aeroflex Circuit Technology SCDCT2566 REV B 8/10/99 Plainview NY (516) 694-6700

td23

A15-A00

BUSACK

(53)

ADRINC

(9)

ADDRESS ADDRESS + 1

td14

MSTRCLR (52)

RESET

(47)

tpw15

td6

See Note

Figure 29 – CT2566 Unit Address Increment

Figure 30 – CT2566 direct reset

CT2566 Direct Increment

SYMBOL DESCRIPTION MIN MAX UNITS

td6 RESET low delay -30 ns

tpw15 MSTRCLR low pulse width 150 -ns

CT2566 Address Increment

SYMBOL DESCRIPTION MIN MAX UNITS

tpw14 ADRINC low pulse width 50 200 ns

td23 Address increment delay -200 ns

NOTE: The RESET (low) pulse width will be approximately equal to that of MSTRCLR (low).

Aeroflex Circuit Technology SCDCT2566 REV B 8/10/99 Plainview NY (516) 694-6700

A02 (38)

A01 (77)

IOEN (42)

SELECT (1)

STRBD (41)

(Internal)

12MHz Clock

RD/WR (2)

READYD (3)

See Note

td1

tpw1

td2

RESET (47)

D00 (67)

A00 (39)

MEM/REG 10)

tpw5

Figure 31 – Programmed CT2566 reset

NOTE: STRBD to IOEN (low) delay is two clock cycles. If contention occurs, delay is two clock cycles following release of bus.

Programmed CT2566 Reset

SYMBOL DESCRIPTION MIN MAX UNITS

td1 READYD low delay (CPU Handshake) -200 ns

td2 IOEN high delay (CPU Handshake) -20 ns

tpw1 READYD pulse width (CPU Handshake) 70 -ns

tpw5 RESET low pulse width 70 -ns

Aeroflex Circuit Technology SCDCT2566 REV B 8/10/99 Plainview NY (516) 694-6700

A15-A00

td10

td11

td9

STACK ADDRESS STACK ADDRESS + 1

D15-D00

BCSTART (46)

TAGEN (5)

MEMOE (56)

MEMWR (57)

MEMCS (16)

READYD (3)

IOEN (42)

SELECT (1)

A00 (39)

A01 (77)

A02 (38)

RD/WR (2)

MEM/REG (10)

D01 (28)

STRBD (41)

(Internal)

12 MHz Clock

BLOCK STATUS WORD TIME TAG TRI-STATE

STACK ADDRESS + 2STACK POINTER

STACK ADDRESS BLOCK ADDRESS

STACK ADDRESS + 3

tpw8

Figure 32 – BC SOM timing (no contention)

BC SOM Timing (No Contention)

SYMBOL DESCRIPTION MIN MAX UNITS

td9 Register Data/Address set-up time -40 ns

td10 Register Data/Address hold time -0ns

td11 BC SOM Cycle DMA delay -120 ns

tpw8 BCSTART low pulse width 70 -ns

Aeroflex Circuit Technology SCDCT2566 REV B 8/10/99 Plainview NY (516) 694-6700

Figure 33 – BC EOM timing (no contention)

(Internal)

12 MHz Clock

A15-A00

STACK ADDRESS + 2 STACK ADDRESS + 3STACK ADDRESS + 1

STACK ADDRESS

STACK POINTER

TRI-STATE TRI-STATETIME TAG

BLOCK STATUS WORD

STACK ADDRESS

td12

tpw10

D15-D00

INT (45)

TAGEN (5)

MEMOE (56)

MEMWR (57)

MEMCS (16)

EOM (6)

tpw9

EOM/Error

Figure 33 – BC EOM timing (no contention) con’t

TRI-STATESTACK ADDRESS + 4

tpw11

MESSAGE COUNT

STACK POINTER STACK POINTER + 1 STACK POINTER + 2 STACK POINTER + 1

MESSAGE COUNT + 1

EOM

BC EOM Timing (No Contention)

SYMBOL DESCRIPTION MIN MAX UNITS

td9 INT low delay -50 ns

tpw9 INT low pulse width 50 200 ns

tpw10 INT low pulse width *tpw9 ns

tpw11 INT low delay 60 -ns

* The min value of tpw10 equals tpw9 minus 30ns.

Aeroflex Circuit Technology SCDCT2566 REV B 8/10/99 Plainview NY (516) 694-6700

BCSTART (46)

TAGEN (5)

MEMOE (56)

MEMWR (57)

MEMCS (16)

SOM (7)

td13

A15-A00

STACK POINTER

D15-D00

STACK ADDRESS + 1 STACK ADDRESS + 3STACK ADDRESS + 2STACK ADDRESS LOOK-UP ADDRESS

STACK ADDRESS BLOCK STATUS WORD TIME TAG TRI-STATE COMMAND BLOCK ADDRESS

1553 COMMAND

WORD

tpw8

tpw12

tpw13

td15

td14

NBGRNT (19)

Figure 34 – RTU SOM (no contention)

RTU SOM Timing (No Contention)

SYMBOL DESCRIPTION MIN MAX UNITS

td13 RTU SOM Cycle DMA delay -200 ns

td14 1553 Command Word set-up time 60 -ns

td15 1553 Command Word hold time 60 -ns

tpw8 BCSTART low pulse width 70 -ns

tpw12 SOM low pulse width 50 200 ns

tpw13 NBGRNT low pulse width 50 200 ns

Aeroflex Circuit Technology SCDCT2566 REV B 8/10/99 Plainview NY (516) 694-6700

Figure 35 – RTU EOM timing (no contention)

(Internal)

12 MHz Clock

tpw10

INT (45)

TAGEN (5)

MEMOE (56)

MEMWR (57)

MEMCS (16)

EOM (6) tpw9

A15-A00

STACK ADDRESS + 2 STACK ADDRESS + 3STACK ADDRESS + 1

STACK ADDRESSSTACK POINTER

TRI-STATE TRI-STATETIME TAG

BLOCK STATUS WORD

STACK ADDRESS

D15-D00

STACK ADDRESS + 4

STACK POINTER

RTU EOM Timing (No Contention)

SYMBOL DESCRIPTION MIN MAX UNITS

tpw9 RESET low delay 50 200 ns

tpw10 MSTRCLR low pulse width *tpw9 ns

* The min value of tpw10 equals tpw9 minus 30ns.

Aeroflex Circuit Technology SCDCT2566 REV B 8/10/99 Plainview NY (516) 694-6700

Figure 36 – MT SOM timing (no contention)

MT SOM Timing (No Contention)

SYMBOL DESCRIPTION MIN MAX UNITS

td16 MT SOM Cycle DMA delay -120 ns

tpw6 BCSTART low pulse width 70 -ns

STACK ADDRESS

(Internal)

12 MHz Clock

tpw6

D01 (28)

SELECT (1)

D15-D00

A15-A00

BCSTART (46)

MEMOE (56)

MEMCS (16)

READYD (3)

IOEN (42)

STRBD (41)

A00 (39)

A01 (77)

RD/WR (2)

MEM/REG (10)

A02 (38)

STACK POINTER

td16

Aeroflex Circuit Technology SCDCT2566 REV B 8/10/99 Plainview NY (516) 694-6700

Figure 37 – DMA Read/Write timing (SOM/EOM cycles)

DMA Read/Write Timing (SOM/EOM Cycles)

SYMBOL DESCRIPTION MIN MAX UNITS

tas1 DMA Address set-up time 40 -ns

tah1 DMA Address hold time 60 -ns

tds1 DMA Address set-up time 83 -ns

tdh1 DMA Address hold time 30 -ns

tas2 DMA Address set-up time -45 ns

tah2 DMA Address hold time 0-ns

tds2 DMA Address set-up time -83 ns

tdh2 DMA Address hold time 0-ns

tpw6 DMA MEMWR low pulse width 70 -ns

tpw7 DMA MEMCS low pulse width 70 -ns

DMA READ DMA WRITE

tdh2

A15-A00

tds2

tas2

12 MHz Clock

MEMWR

(57)

MEMOE

(56)

MEMCS

(16)

(Internal)

D15-D00

tah2

tas1 tpw7

tpw6

tah1

tdh1

tds1

Aeroflex Circuit Technology SCDCT2566 REV B 8/10/99 Plainview NY (516) 694-6700

SELECT

STRBD

RD/WR

IOEN

READYD

EXTLD

EXTEN

CHB/CHA

TAGEN

INT

EOM

BCSTART

SOM

RESET

STATERR

MSGERR

ADRINC

CTLIN B/A

MEM/REG

CTLOUT B/A

CLOCK IN

TIMEOUT

LOOPERR

MSTRCLR

BUSREQ

BUSACK

BUSGRNT

N/C

MEMCS

MEMOE

MEMWR

N/C

NBGRNT

+5 Volt

D15

D14

D13

D12

D11

D10

D09

D08

D07

D06

D05

D04

D03

D02

D01

D00

SSFLAG

SVCREQ

SSBUSY

DBAC

RTU/BC

A15

A14

A13

A12

A11

A10

A09

A08

A07

A06

A05

A04

A03

A02

A01

A00

GND

CT2566

MIL-STD-1553

to µPROCESSOR

INTERFACE UNIT

DDIP Pin Connection Diagram, CT2566 and Pinout

Table 6 – CT2566 Pin Out Description

(DDIP)

#Function Pin

#Function

1SELECT 40 GND

2RD/WR 41 STRBD

3READYD 42 IOEN

4EXTEN 43 EXTLD

5TAGEN 44 CHB/CHA

6EOM 45 INT

7SOM 46 BCSTART

8STATERR 47 RESET

9ADRINC 48 MSGERR

10 MEM/REG 49 CTLIN B/A

11 CLOCK IN 50 CTLOUT B/A

12 LOOPERR 51 TIMEOUT

13 BUSREQ 52 MSTRCLR

14 BUSGRNT 53 BUSACK

15 N/C 54 WR

16 MEMCS 55 CS

17 OE 56 MEMOE

18 N/C 57 MEMWR

19 NBGRNT 58 N/C

20 + 5 Volt 59 MT

21 D15 60 D14

22 D13 61 D12

23 D11 62 D10

24 D09 63 D08

25 D07 64 D06

26 D05 65 D04

27 D03 66 D02

28 D01 67 D00

29 SSFLAG 68 SVCREQ

30 SSBUSY 69 DBAC

31 RTU/BC 70 A15

32 A14 71 A13

33 A12 72 A11

34 A10 73 A09

35 A08 74 A07

36 A06 75 A05

37 A04 76 A03

38 A02 77 A01

39 A00 78 GND

Aeroflex Circuit Technology SCDCT2566 REV B 8/10/99 Plainview NY (516) 694-6700

SELECT

STRBD

RD/WR

IOENBL

READYD

EXTLD

EXTEN

CHB/CHA

TAGEN

INT

EOM

BCSTART

SOM

RESET

STATERR

MSGERR

ADRINC

CTLIN B/A

MEM/REG

CTLOUT B/A

CLOCK IN

TIMEOUT

LOOPERR

MSTRCLR

BUSYREQ

BUSACK

BUSGRNT

N/C

MEMCS

MEMOE

MEMWR

N/C

NBGRNT

+5V

D15

D14

D13

D12

D11

D10

D09

D08

D07

D06

D05

D04

D03

D02

D01

D00

SSFLAG

SVCREQ

SSBUSY

DBAC

RTU/BC

A15

A14

A13

A12

A11

A10

A09

A08

A07

A06

A05

A04

A03

A02

A01

A00 (LSB)

CASE GND

GROUND

Table 7 – CT2566 Pin Out Description

(FP)

#Function Pin

#Function

1N/C 42 N/C

2SELECT 43 GROUND

3STRBD 44 CASE GND

4RD/WR 45 A00 (LSB)

5IOENBL 46 A01

6READYD 47 A02

7EXTLD 48 A03

8EXTEN 49 A04

9CHB/CHA 50 A05

10 TAGEN 51 A06

11 INT 52 A07

12 EOM 53 A08

13 BCSTART 54 A09

14 SOM 55 A10

15 RESET 56 A11

16 STATERR 57 A12

17 MSGERR 58 A13

18 ADRINC 59 A14

19 CTLIN B/A60 A15

20 MEM/REG 61 RTU/BC

21 CTLOUT B/A62 DBAC

22 CLOCK IN 63 SSBUSY

23 TIMEOUT 64 SVCREQ

24 LOOPERR 65 SSFLAG

25 MSTRCLR 66 D00

26 BUSYREQ 67 D01

27 BUSACK 68 D02

28 BUSGRNT 69 D03

29 WR 70 D04

30 N/C 71 D05

31 CS 72 D06

32 MEMCS 73 D07

33 MEMOE 74 D08

34 OE 75 D09

35 MEMWR 76 D10

36 N/C 77 D11

37 N/C 78 D12

38 NBGRNT 79 D13

39 MT 80 D14

40 +5V 81 D15

41 N/C 82 N/C

CT2566FP

MIL-STD-1553

to µPROCESSOR

INTERFACE UNIT

Flat Package Pin Connection Diagram, CT2566 and Pinout

N/C

N/C N/C

N/C

Aeroflex Circuit Technology SCDCT2566 REV B 8/10/99 Plainview NY (516) 694-6700

.100

2.100

1.500

TYP

Lead 1 & ESD

Designator

1.900

1.800

Pin 19 Pin 20

Pin 59

Pin 41

Pin 2 .050

TYP

1.650

1.870

.100

.110Pin 1

.250

MAX

Pin 39 Pin 40

Pin 78

Pin 22

Pin 21

Pin 60

.018 DIA

TYP

.080

.180

MAX

.010

±.002

.015

2.000

Pin 42

.095

Pin 41

2.200

MAX

Lead 1 & ESD

Designator

1.610

MAX

Designator

MAX

.400

MIN

.050 Lead Centers

41 Leads/Side

(4 Places)

Pin 82

Flat Package Outline

Plug In Package Outline

.050

Aeroflex Circuit Technology SCDCT2566 REV B 8/10/99 Plainview NY (516) 694-6700

CIRCUIT TECHNOLOGY

Aeroflex Circuit Technology

35 South Service Road

Plainview New York 11803

Telephone: (516) 694-6700

FAX: (516) 694-6715

Toll Free Inquiries: (800) THE-1553

Specifications subject to change without notice

www.aeroflex.com/act1.htm E-Mail: sales-act@aeroflex.com

Ordering Information

Model Number Screening DESC SMD # Package

CT2566 Military Temperature, -55°C to +125°C,

Screened to the individual test methods

of MIL-STD-883

-Plug in

CT2566-FP - Flat Package