Fujitsu MHM200AT, MHM2100AT, MHM215OAT, MHL2300AT manual C141-E104-02EN 111

5.6 Timing

5.6.3.2 Ultra DMA data burst timing requirements

Table 5.18 Ultra DMA data burst timing requirements (1 of 2)

NAME	MODE 0		MODE 1		MODE 2		MODE 3		MODE 4		COMMENT
	(in ns)		(in ns)		(in ns)		(in ns)		(in ns)
	MIN	MAX	MIN	MAX	MIN	MAX	MIN	MAX	MIN	MAX	(see Notes 1 and 2)
t2CYCTYP	240		160		120		90		60		Typical sustained average two cycle
											time
tCYC	112		73		54		39		25		Cycle time allowing for asymmetry
											and clock variations (from
											STROBE edge to STROBE edge)
t2CYC	230		154		115		86		57		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		Data setup time (at recipient)
											(see Note 4)
tDH	5		5		5		5		5		Data hold time (at recipient)
											(see Note 4)
tDVS	70		48		30		20		6		Data valid setup time at sender (from
											data valid until STROBE edge)
											(see Note 5)
tDVH	6		6		6		6		6		Data valid hold time at sender (from
											STROBE edge until data may
											become invalid) (see Note 5)
tFS	0	230	0	200	0	170	0	130	0	120	First STROBE time (for device to
											first negate DSTROBE from STOP
											during a data in burst)
tLI	0	150	0	150	0	150	0	100	0	100	Limited interlock time (see Note 3)
tMLI	20		20		20		20		20		Interlock time with minimum
											(see Note 3)
tUI	0		0		0		0		0		Unlimited interlock time (see Note 3)
tAZ		10		10		10		10		10	Maximum time allowed for output
											drivers to release (from asserted or
											negated)
tZAH	20		20		20		20		20		Minimum delay time required
											for output
tZAD	0		0		0		0		0		Drivers to assert or negate (from
											released)
tENV	20	70	20	70	20	70	20	55	20	55	Envelope time (from DMACK- to
											STOP and HDMARDY- during
											data in burst initiation and from
											DMACK to STOP during data out
											burst initiation)
tSR		50		30		20		NA		NA	STROBE-to-DMARDY-time (if
											DMARDY- is negated before this long
											after STROBE edge, the recipient shall
											receive no more than one additional
											data word)
tRFS		75		70		60		60		60	Ready-to-Final-STROBE time
											(After negating DMARDY-,
											STROBE edges should not be sent
											beyond this period)
tRP	160		125		100		100		100		Ready-to-pause time (that recipient
											shall wait to pause after negating
											DMARDY-)
tIORDYZ		20		20		20		20		20	Maximum time before releasing IORDY

C141-E104-02EN 5-111