|
|
|
| C/D, I/O, |
|
|
|
|
|
| MSG, | ACK, | DB(7,0) |
Bus Phase | BSY | SEL | REQ | ATN | DB(P) | |
|
|
|
|
|
| |
BUS FREE | None | None | None | None | None | |
ARBITRATION | All | Win | None | None | S ID | |
SELECTION | I&T | Init | None | Init | Init | |
RESELCTION | I&T | Targ | Targ | Init | Targ | |
COMMAND | Targ | None | Targ | Init | Init | |
DATA IN | Targ | None | Targ | Init | Targ | |
DATA OUT | Targ | None | Targ | Init | Init | |
STATUS | Targ | None | Targ | Init | Targ | |
MESSAGE IN | Targ | None | Targ | Init | Targ | |
MESSAGE OUT | Targ | None | Targ | Init | Init | |
|
|
|
|
|
|
|
All: | The signal shall be driven by all SCSI devices that are actively | |||||
| arbitrating. |
|
|
|
|
|
S ID: | A unique data bit (the SCSI ID) shall be driven by each SCSI | |||||
| device that is actively arbitrating; the other seven data bits shall be | |||||
| released (i.e., not driven) by this SCSI device. The parity bit | |||||
| (DB(P)) may be released or driven to the true state, but shall never | |||||
| be driven to the false state during this phase. |
|
| |||
| The signal shall be driven by the initiator, target or both, as | |||||
| specified in the SELECTION phase and RESELECTION phase. | |||||
Init: | If driven, this signal shall be driven only by the active initiator. | |||||
None: The signal shall be released; that is, not be driven by any SCSI | ||||||
| device. The bias circuitry of the bus terminators pulls the signal to | |||||
| the false state. |
|
|
|
|
|
Win: | The signal shall be driven by the one SCSI device that wins | |||||
| arbitration. |
|
|
|
|
|
Targ: | If the signal is driven, it shall be driven only by the active target. | |||||
|
|
|
|
|
|
|
M3099GX/GH OEM Manual |