Fujitsu MPG3XXXAT manual Ultra DMA data burst timing requirements 2

Table 5.17 Ultra DMA data burst timing requirements (2 of 2)

	MODE 0		MODE 1		MODE 2		MODE 3		MODE 4		MODE 5
NAME	(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
tAZ		10		10		10		10		10		10	Maximum time allowed for output
													drivers to release (from asserted or
													negated)
tZAH	20		20		20		20		20		20		Minimum delay time required for
													output
tZAD	0		0		0		0		0		0		Drivers to assert or negate (from
													released)
tENV	20	70	20	70	20	70	20	55	20	55	20	50	Envelope time (from DMACK- to
													STOP and HDMARDY- during
													data in burst initiation and from
													DMACK to STOP during data out
													burst initiation)
tRFS		75		70		60		60		60		50	Ready-to-final-STROBE time (no
													STROBE edges shall be sent this
													long after negation of DMARDY-)
tRP	160		125		100		100		100		85		Ready-to-pause time (that recipient
													shall wait to pause after negating
													DMARDY-)
tIORDYZ		20		20		20		20		20		20	Maximum time before releasing
													IORDY
tZIORDY	0		0		0		0		0		0		Minimum time before driving
													IORDY (*4)
tACK	20		20		20		20		20		20		Setup and hold times for DMACK-
													(before assertion or negation)
tSS	50		50		50		50		50		50		Time from STROBE edge to
													negation of DMARQ or assertion
													of STOP (when sender terminates
													a burst)

*1: Except for some instances of tMLI that apply to host signals only, the parameters tUI, tMLI and tLI indicate sender-to-recipient or recipient-to-sender interlocks, i.e., one agent (either sender or recipient) is waiting for the other agent to respond with a signal before proceeding. tUI is an unlimited interlock that has no maximum time value. tMLI is a limited time-out that has a defined minimum. tLI is a limited time-out that has a defined maximum.

*2: 80-conductor cabling shall be required in order to meet setup (tDS, tCS) and hold (tDH, tCH) times in modes greater than 2.

*3: Timing for tDVS, tDVH, tCVS and tCVH shall be met for lumped capacitive loads of 15 and 40 pf at the connector where all signals (Data and STROBE) have the same capacitive load value. Due to reflections on the cable, the measurement of these timings is not valid in a normally functioning system.

*4: For all modes the parameter tZIORDY may be greater than tENV due to the fact that the host has a pull up on IORDY- giving it a known state when not actively driven.

*5: The parameters tDS, and tDH for mode 5 is defined for a recipient at the end of the cable only in a configuration with one device at the end of the cable.

Note:

All timing measurement switching points (low to high and high to low) shall be taken at 1.5V.

5 - 98 C141-E110-02EN