CT2566 Datasheet, PDF (3/37 Pages) Aeroflex Circuit Technology – CT2566 MIL-STD-1553 to Microprocessor Interface Unit

PIN NO.
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
NAME
SELECT
RD/WR
READYD
EXTEN
TAGEN
EOM
SOM
STATERR
ADRINC
MEM/REG
CLOCK IN
LOOPERR
BUSREQ
BUSGRNT
Not Used
MEMCS
OE
N/C
NBGRNT
+ 5 Volt
D15
D13
D11
D09
D07
D05
D03
I/O
DESCRIPTION
I
Select. When active, selects CT2566 for operation.
I
Read/Write. Controls CPU bus data direction.
O
Ready Data. When active indicates data has been received
from, or is available to the CPU.
O
External Enable. Output from CT2566 to enable output from
external devices. Same timing as MEMOE.
O
Tag Enable. Enables an external time tag counter for
transferring the time tag word into memory.
I
End of Message. Input from 1553 device indicating end of
message.
I
Start of Message. Input from 1553 device indicating start of
message in RTU mode.
I
Status Error. Input from 1553 device when status word has
either a bit set or unexpected RT address (in BC mode only).
I
Address Increment. Sent from 1553 device to increment
address counter following word transfer.
I
Memory/Register. Input from CPU to select memory or
register data transfer.
I
Clock input; 50% duty cycle, 12MHz, max.
I
Loop Error. Input from 1553 device if short loop BIT fails.
I
Bus Request. When active, indicates 1553 device requires
use of the address/data bus.
O
Bus Grant. Handshake output to 1553 device in response to
BUS REQUEST indicating address/data bus available to
1553 device.
-
-
O
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.
I
Output Enable. Input from 1553 device used to enable
memory on the parallel bus.
-
Not Used.
I
Low pulse from 1553 device preceding start of received new
protocol sequence. Used with superseding command to reset
DMA in progress.
I
Logic power supply.
I/O
Data Bus Bit 15 (MSB).
I/O
Data Bus Bit 13.
I/O
Data Bus Bit 11.
I/O
Data Bus Bit 9.
I/O
Data Bus Bit 7.
I/O
Data Bus Bit 5.
I/O
Data Bus Bit 3.
Table 2 – Pin Functions (78 Pin DIP)
Aeroflex Circuit Technology
3
SCDCT2566 REV B 8/10/99 Plainview NY [phone]