Fujitsu 600C manual 5Signal delay times definition Time Definition

The signal delay times for each bus phase are defined as follows-

Table 4-5Signal delay times definition

No.	Item	Time	Definition
1	Arbitration	2.4 æs	The minimum time an SCSI device shall wait from
	delay		asserting BSY for arbitration until the DATA BUS can
			be examined to see if arbitration has been won. There is
			no maximum time.
2	Assertion	90 ns	The minimum time that a target shall assert REQ (or
	period		REQB) while using synchronous data transfers. Also,
			the minimum time that an initiator shall assert ACK
			while using synchronous data transfers.
3	Bus Clear	800 ns	The maximum time for an SCSI device to stop driving
	delay		all bus signals after: (1) The BUS FREE phase is
			detected (BSY and SEL both false for a bus settle delay)
			(2) SEL is received from another SCS] device during the
			ARBITRATION phase (3) The transition of RST to true.
			For the first condition listed. 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
4	Bus free delay	800 ns	The minimum time that an SCSI device shall wait from
			its detection of the BUS FREE phase (BSY and SEL
			both false
5	Bus set delay	1.8 _s	The maximum time for an SCSI device to assert BSY
			and its SCSI ID bit on the DATA BUS after it detects
			BUS FREE phase (BSY and SEL both false for a bus
			settle delay) for the purpose of entering the
			ARBITRATION phase
6	Bus settle	400 ns	The minimum time to wait for the bus to settle after
	delay		changing certain control signals as called out in the
			protocol definitions
7	Cable skew	10 ns	The maximum difference in propagation time allowed
	delay		between any two SCSI bus signals measured between
			any two SCSI devices.
8	Data release	400 ns	The maximum time for an initiator to release the DATA
	delay		BUS signals following the transition of the I/O signal
			from false to true.
9	Deskew delay	45 ns	The minimum time required for deskew of certain
			signals
10	Disconnection	200 æs	The minimum time that a target shall wait after
			releasing BSY before participating in an
			ARBITRATION phase when honoring a DISCONNECT
			message from the initiator

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