Fujitsu MHU2100AT manual Name Mode Comment, Strobe

5.6 Timing

5.6.3.2 Ultra DMA data burst timing requirements

Table 5.29 Ultra DMA data burst timing requirements (1 of 2)

NAME	MODE 0		MODE 1		MODE 2		MODE 3		MODE 4		MODE 5
	(in ns)		(in ns)		(in ns)		(in ns)		(in ns)		(in ns)		COMMENT
	MIN	MAX	MIN	MAX	MIN	MAX	MIN	MAX	MIN	MAX	MIN	MAX
t2CYCTYP	240		160		120		90		60		40		Typical sustained average two
													cycle time
tCYC	112		73		54		39		25		16.8		Cycle time allowing for
													asymmetry and clock variations
													(from STROBE edge to STROBE
													edge)
t2CYC	230		153		115		86		57		38		Two cycle time allowing for
													clock variations (from rising edge
													to next rising edge or from falling
													edge to next falling edge of
													STROBE)
tDS	15		10		7		7		5		4		Data setup time at recipient (from
													data valid until STROBE edge)
													(*2), (*5)
tDH	5		5		5		5		5		4.6		Data hold time at recipient (from
													STROBE edge until data may
													become invalid) (*2), (*5)
tDVS	70		48		31		20		6.7		4.8		Data valid setup time at sender
													(from data valid until STROBE
													edge) (*3)
tDVH	6.2		6.2		6.2		6.2		6.2		4.8		Data valid hold time at sender
													(from STROBE edge until data
													may become invalid) (*3)
tCS	15		10		7		7		5		5		CRC word setup time at device
													(*2)
tCH	5		5		5		5		5		5		CRC word hold time device (*2)
tCVS	70		48		31		20		6.7		10		CRC word valid setup time at
													host (from CRC valid until
													DMACK-negation) (*3)
tCVH	6.2		6.2		6.2		6.2		6.2		10		CRC word valid hold time at
													sender (from DMACK-negation
													until CRC may become invalid)
													(*3)
tZFS	0		0		0		0		0		35		Time from STROBE output
													released-to-driving until the first
													transition of critical timing
tDZFS	70		48		31		20		6.7		25		Time from data output released-
													to-driving until the first transition
													of critical timing
tFS		230		200		170		130		120		90	First STROBE time (for device to
													first negate DSTROBE from
													STOP during a data in burst)

C141-E202-01EN 5-149