Fujitsu MCJ3230SS manual Timing Rule, 75 Timing specifications 1 of

Host Interface

4.5 Timing Rule

Table 4.75 Timing specifications (1 of 3)

No.	Name	Standard	Timing specification
1	Arbitration	2.4 µs min.	The minimum wait period between the time the
	Delay		SCSI device sends a BSY signal and the time the
			value on the data bus for determining the
			priority of bus use is judged in the
			ARBITRATION phase. A maximum time is not
			defined.
2	Assertion Period	90 ns min.	Minimum pulse width of an ACK signal sent by
			INIT and an REQ signal sent by TARG for
			synchronous data transfer.
3	Bus Clear Delay	800 ns max.	Maximum allowable period between the time
			either of the following events occurs and the
			time the SCSI device stops driving all bus
			signals.
			(1) Detection of the BUS FREE phase (when
			both BSY and SEL signal become false
			during Bus Settle Delay).
			Note:
			Maximum allowable period between
			the time both BSY and SEL signal
			became false and the time the bus is
			released is 1,200 ns.
			An SCSI device that requires a period
			longer than Bus Settle Delay for the
			detection of the BUS FREE phase
			must release the bus within (Bus Clear
			Delay) minus (Bus Settle Delay excess
			time).
			(2) Another SCSI device asserts the SEL signal
			during an ARBITRATION phase.
			(3) The RST signal becomes true (RESET
			condition).
4	Bus Free Delay	800 ns min.	Minimum wait period between the time the
			SCSI device detects a BUS FREE phase and the
			time it sends a BSY signal to initiate an
			ARBITRATION phase.
5	Bus Set Delay	1.8 µs max.	Maximum allowable period between the time an
			SCSI device detects a BUS FREE phase and the
			time it sends BSY and SCSI ID signals to
			initiate an ARBITRATION phase.

4-46 C156-E224-01EN