Table 6

+==============-=====================================-========================+
|  Bus phase   |         A cable signals             |     B cable signals    |
|              |-------------------------------------+------------------------|
|              |      |      | C/D, |      |         |      |      | DB(31-8) |
|              |      |      | I/O, |      |         |      |      |  DB(P1)  |
|              |      |      | MSG, | ACK, | DB(7-0) |      |      |  DB(P2)  |
|              | BSY  | SEL  | REQ  | ATN  |  DB(P)  | REQB | ACKB |  DB(P3)  |
|--------------+------+------+------+------+---------+------+------+----------|
|  BUS FREE    | None | None | None | None |   None  | None | None |    None  |
|  ARBITRATION | All  | Win  | None | None |   S ID  | None | None |    None  |
|  SELECTION   | I&T  | Init | None | Init |   Init  | None | None |    None  |
|  RESELECTION | I&T  | Targ | Targ | Init |   Targ  | None | None |    None  |
|  COMMAND     | Targ | None | Targ | Init |   Init  | None | None |    None  |
|  DATA IN     | Targ | None | Targ | Init |   Targ  | Targ | Init |    Targ  |
|  DATA OUT    | Targ | None | Targ | Init |   Init  | Targ | Init |    Init  |
|  STATUS      | Targ | None | Targ | Init |   Targ  | None | None |    None  |
|  MESSAGE IN  | Targ | None | Targ | Init |   Targ  | None | None |    None  |
|  MESSAGE OUT | Targ | None | Targ | Init |   Init  | None | None |    None  |
|-----------------------------------------------------------------------------|
|                                                                             |
|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.                      |
|                                                                             |
|I&T:    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.                                                              |
+=============================================================================+