CT1611 Datasheet, PDF (10/24 Pages) Aeroflex Circuit Technology – DMA Controller with Buffer Memory,MIL-STD-1750A Compatible

Summary of I/O Commands for CT1611 1553B Interface
(All Codes HEX)
Bus Controller I/O
(Read or Write) Command Word # 1
(Read or Write) Command Word # 2
(Read or Write) Transaction Word
Address
Code
(8 Bit Mode)
Description
XX00 (Low)
XX01 (High)
XX02
All Transfers
1. Second command word for RT to RT Transfers
2. Also associated mode data for mode change such as sync w/data
3. Also used for RTU vector word
XX0C
Defines type of transfer and BUS selection
Examples
Function
Normal xfer
Normal xfer
RT to RT
Mode (No Data)
Mode (No Data)
Mode (Rtn’d Data), i.e. vector word last
cmd, etc.
Mode (ass’td Data), i.e. sync w/data
Bus 0
Bus 1
Bus 0
Bus 1
Bus 0
Bus 1
Bus 0
Bus 1
Bus 0
Bus 1
Data
0000
0008
0001
0009
0003
000B
0005
000D
0007
000F
(Write Only)
Trigger
(Read Only)
Status Word 1
XX2A
XX3C
BC (Read Only)
RTU (Read Only)
(Read Only)
Status Word 2
Rtn’d Mode Data
Sync w/Data
Sync Word
Command Word
XX3A
XX36
(Read Only)
Receive Command Word
XX38
(Read or Write) Vector Word
XX02
Triggers Bus Transaction
Note: Command word(s) and transaction code must be loaded
Return status word for all transactions (first for RT to RT).
Note: This register is preset to FFFF at beginning of transaction and
at reset.
Second returned status word for RT to RT xfers, also preset FFFF.
Also returned mode data, such as vector word and last command.
Received command word for all transactions. i.e. transmit, receive*
and mode.
* use XX38
Double Buffered version of above for valid receive commands
(provides more I/O time).
Mode Data
-to be transmitted
- same reg as CW # 2
SCDCT1611 Rev A
10