DATA BUS

COMMAND

STATUS

NVCR

T0-T15

1

3

NRES/NSYNC

When applicable

2

DATA BUS

COMMAND

STATUS

NVCR

T0-T15

1

2

4

3

DATA

NDATA

NSYNC

When applicable

DATA BUS

COMMAND

STATUS

NVCR

T0-T15

1 2

DATA

3

NENVW

When applicable

5

SCDCT2578 REV B 3/11/98

1. Valid receive command word received, contents available on T0-T15 for illegalization purposes.

2. Valid transmit command word received, contents available on T0-T15.

3. Status response of transmitting terminal received.

4. First valid data word (1760 header word) received, contents available on T0-T15 and stored in 32 word data memory.

5. Last valid data word received, contents available on T0-T15 and stored in 32 word data memory. Status bits must be valid within 250nS.

6. Status register contents transferred to transmit buffer.

7. NCMDSTRB indicates valid message received, command word available on T0-T15.

8. Data words transferred from 32 word data memory to subsystem at 500 nS per word.

MODE CODES WITHOUT DATA

1. Valid command word received, contents available on T0-T15 for illegalization purposes. Status must be valid within 600 nS.

2. Status register contents transferred to transmit buffer.

3. Synchronise mode command, T0-T15 = 0.

MODE CODES WITH DATA RECEIVE

1. Valid command word received, contents available on T0-T15 for illegalization purposes. Status must be valid within 600 nS.

2. Valid data word received, contents available on T0-T15. Synchronise data word stored in 32 word data memory.

3. Status register contents transferred to transmit buffer after message validation.

4. Synchronise data word(when applicable) transferred from 32 word data memory to main memory and available on T0-T15.

MODE CODES WITH DATA TRANSMIT

1. Valid command word received, contents available on T0-T15 for illegalization purposes. Status must be valid within 600 nS.

2. Status register contents transferred to transmit buffer after message validation.

3. Vector word (when applicable) transferred from subsystem to transmit buffer.