Maxtor 2B020H1, 2B015H1, 2B010H1 manual Ultra DMA Timing, Mode

AT INTERFACE DESCRIPTION

Ultra DMA Timing

T IM IN G PARAMET ERS (all tim es in nanoseconds )		MODE 0		MODE 1		MODE 2		MODE 3		MODE 4		MODE 5
		MIN	MAX	MIN	MAX	MIN	MAX	MIN	MAX	MIN	MAX	MIN	MAX
tCYC	Cycle Time (from STROBE edge to STROBE edge)	112		73		54		39		25		16.8
t2CYC	Two cycle time (from ris ing edge to next ris ing edge or	230		153		115		86		57		38
	from falling edge to next falling edge of STROBE )
tDS	D ata s etup time (at rec ipient)	15		10		7		7		5		4
tDH	D ata hold time (at rec ipient)	5		5		5		5		5		4.6
tDVS	D ata valid setup time at sender (time from data bus being	70		48		31		20		6.7		4.8
	valid until STROBE edge)
tDVH	Data valid hold time at sender (time from STROBE edge	6.2		6.2		6.2		6.2		6.2		4.8
	until data may go invalid)
tF S	Firs t STROBE (time for device to send first STROBE)	0	230	0	200	0	170	0	130	0	120	0	90
tL I	Limited interlock time (time allowed between an action by	0	150	0	150	0	150	0	100	0	100	0	75
	one agent, either host or device, and the following action
	by the other agent)
tML I	Interlock time with minimum	20		20		20		20		20		20
tUI	Unlimited interlock time	0		0		0		0		0		0
tAZ	Maxim um time allowed for outputs to release		10		10		10		10		10		10
tZAH	Minimum delay time required for output drivers turning on	20		20		20		20		20		20
tZ AD	(from releas ed state)	0		0		0		0		0		0
tENV	Envelope time (all control signal transitions are within the	20	70	20	70	20	70	20	55	20	55	20	50
	D MACK envelope by this much time)
tSR	STROBE to D MARDY (response time to ensure the		50		30		20		NA		NA		NA
	synchronous pause case when the rec ipient is pausing)
tRF S	Ready-to-final -STROBE time (no more STROBE edges		75		70		60		60		60		50
	may be sent this long after receiving D MARDY- negation)
tRP	Ready-to-pause time (time until a recipient may assume	160		125		100		100		100		85
	that the sender has paused after negation of D MARDY-)
tIORDYZ	Pull-up time before allowing IORD Y to be releas ed		20		20		20		20		20		20
tZ IORD Y	Minim um time device shall wait before driving IORDY	0		0		0		0		0		0
tACK	Setup and hold times before assertion and negation of	20		20		20		20		20		20
	DMAC K-
tSS	Time from STROBE edge to STOP assertion when the	50		50		50		50		50		50
	sender is stopping

DMARQ
(device)
tUI
DMACK-
(host)
tACK	tENV
STOP
(host)
tACK	tENV
HDMARDY-
(host)
tZIORDY
DSTROBE
(device)
tAZ
DD(15:0)
tACK
DA0, DA1, DA2,
CS0-, CS1-

tFS

tZAD
tFS
tZAD
tVDS	tDVH

Figure 5 - 4

Initiating an Ultra DMA Data In Burst

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