
RESVD
CMD
 *
The status is not cleared or loaded before it is transmitted with the
message error bit set.
    the command was a broadcast the status transmission will be
suppressed and the broadcast bit in the status register set.
Error Conditions
STATUS
TX VW
CMD
VW
*
STATUS
SYNC
CMD
DATA
*
STATUS
CMD
 *
STATUS
TX LST
LST
CMD
13
SCDCT2578  REV B   3/11/98
RESERVED MODE CODES (09-0F)
SYNCHRONIZE WITH DATA WORD (11)
Action taken by device
1. Invalid command.
No response.
Command ignored.
2. Command followed by
     another word.
No status response.
Set message error.
Sequence terminated.
3. T/R bit of command set
    to zero.
No status response.
Set message error.
Sequence terminated
4. T/R bit of command set
    to zero and broadcast
    address
No status response.
Set message error.
Set broadcast.
Sequence terminated.
  RANSMIT VECTOR WORD (10)
On receipt of a valid Command to transmit the Vector Word the
device will initially respond with Status.
   fter the Status response has been initiated the Vector Word will
be enabled onto T0-T15 from the subsystem with signal NENVW
and transferred to the Output Buffer ready for transmission onto the
1553 data bus following the Status.
Error Conditions
Action taken by device
1. Invalid command.
No response.
Command ignored.
2. Command followed by
     another word.
No status response.
Set message error.
Sequence terminated.
3. T/R bit of command set
    to zero.
No status response.
Set message error.
Sequence terminated
4. Broadcast address.
No status response.
Set message error.
Set broadcast.
Sequence terminated.
5. T/R bit of command set
    to zero and broadcast
    address
No status response.
Set message error.
Set broadcast.
Sequence terminated.
The Synchronize data word received is stored in the data buffer
memory until message validation is complete after which the
device will respond with Status.
  f the command was a broadcast the status transmission will be
suppressed and the broadcast bit in the status register set.
After the Status response has been initiated the Synchronize Word
will be transferred to the subsystem. The NSYNC signal will go
active low for 500 nS during which time T0-T15 will be set to the
data word received.
Error Conditions
Action taken by device
1. Invalid command.
No response.
Command ignored.
2. Command not followed
    contiguously by data
    word
No status response.
Set message error.
Sequence terminated.
3. Command followed by
    too many words.
No status response.
Set message error.
Sequence terminated
4. T/R bit of command set
    to one.
No status response.
Set message error.
Sequence terminated.
5. T/R bit of command set
    to one and broadcast
    address
No status response.
Set message error.
Set broadcast.
Sequence terminated.
TRANSMIT LAST COMMAND (12)
The status response contains the resulting status from the previous
command.
The data word transmitted following the status word contains the
previous valid command (provided it was not Transmit Last
Command).