CT2566 datasheet(3/37 Pages) AEROFLEX

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

PIN NO.

NAME

I/O

DESCRIPTION

SELECT

Select. When active, selects CT2566 for operation.

RD/WR

Read/Write. Controls CPU bus data direction.

READYD

Ready Data. When active indicates data has been received

from, or is available to the CPU.

EXTEN

External Enable. Output from CT2566 to enable output from

external devices. Same timing as MEMOE.

TAGEN

Tag Enable. Enables an external time tag counter for

transferring the time tag word into memory.

EOM

End of Message. Input from 1553 device indicating end of

message.

SOM

Start of Message. Input from 1553 device indicating start of

message in RTU mode.

STATERR

Status Error. Input from 1553 device when status word has

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

ADRINC

Address Increment. Sent from 1553 device to increment

address counter following word transfer.

MEM/REG

Memory/Register. Input from CPU to select memory or

CLOCK IN

Clock input; 50% duty cycle, 12MHz, max.

LOOPERR

Loop Error. Input from 1553 device if short loop BIT fails.

BUSREQ

Bus Request. When active, indicates 1553 device requires

use of the address/data bus.

BUSGRNT

Bus Grant. Handshake output to 1553 device in response to

BUS REQUEST indicating address/data bus available to

1553 device.

Not Used

MEMCS

Memory 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.

Output Enable. Input from 1553 device used to enable

memory on the parallel bus.

N/C

Not Used.

NBGRNT

Low pulse from 1553 device preceding start of received new

protocol sequence. Used with superseding command to reset

DMA in progress.

+ 5 Volt

Logic power supply.

D15

I/O

Data Bus Bit 15 (MSB).

D13

I/O

Data Bus Bit 13.

D11

I/O

Data Bus Bit 11.

D09

I/O

Data Bus Bit 9.

D07

I/O

Data Bus Bit 7.

D05

I/O

Data Bus Bit 5.

D03

I/O

Data Bus Bit 3.

Table 2 – Pin Functions (78 Pin DIP)

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