6100 BSC Programming Manual

6100 BSC Link and Station Management
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| Request Line Action |
| |
| |
| READ (ACK option) ACK -----> |
| <------ msg |
| |
| READ (RVI option) RVI -----> |
| <------ msg |
| |
| READ (with line in EOT -----> |
| WRITE state) <------ msg |
| |
| WRITE msg -----> |
| <------ ACK |
| |
| WRITEREAD msg -----> |
| <------ msg |
| |
| CONTROL (TTD option) TTD -----> |
| <------ NAK |
| |
| CONTROL (WACK option) WACK ----> |
| <------ ENQ |
| |
| CONTROL (EOT option) EOT -----> |
| |
| |
| |
| After a READ, WRITE, or WRITEREAD request, the next |
| data transfer request is READ, WRITE, WRITEREAD, |
| or CONTROL. In each of these cases, BSC starts by |
| transmitting information, as shown, so RTS must be |
| raised. To overlap line turnaround with processing, |
| BSC raises RTS in advance, between application |
| requests. |
| |
| |
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Figure 2-8. Overlapping Line Turnaround with Processing
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