FUJITSU C150-E049-02EN - Manual (Page 45)

3-12 M3099GX/GH OEM Manual
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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