Arbitration Delay

The minimum time an SCSI device shall wait from asserting BSY for arbitration until the DATA BUS can be examined to see if arbitration has been won. There is no maximum time.

Assertion period

The minimum time that a target shall assert REQ (or REQB) while using synchronous data transfers. Also, the minimum time that an initiator shall assert ACK (or ACKB) while using synchronous data transfers. REQB and ACKB timings only apply to optional wide data transfers.

Bus Clear Delay

The maximum time for an SCSI device to stop driving all bus signals after:

The BUS FREE phase is detected.

SEL is received from another SCSI device during the ARBITRATION phase.

The transition of RST to true.

For the first condition above, the maximum time for an SCSI device to clear the bus is 1200 nanoseconds from BSY and SEL first becoming both false. If an SCSI device requires more than a bus settle delay to detect BUS FREE phase, it shall clear the bus within a bus clear delay minus the excess time.

Bus Free Delay

The minimum time that an SCSI device shall wait from its detection of the BUS FREE phase until its assertion of BSY when going to the ARBITRATION phase.

Bus Set Delay

The maximum time for an SCSI device to assert BSY and its SCSI ID bit the DATA BUS after it detects BUS FREE phase for the purpose of entering the ARBITRATION phase.

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M3099GX/GH OEM Manual