Samsung 3.5" hard disk drives, spinpoint v40 manual Multiword DMA timing parameters Mode

DISK DRIVE OPERATION

Table 6-18Multiword DMA data transfer

		Multiword DMA timing parameters		Mode 0	Mode 1	Mode 2	Note
				ns	ns	ns
t0		Cycle time	(min)	480	150	120	see note
tD		DIOR-/DIOW-	(min)	215	80	70	see note
tE		DIOR- data access	(max)	150	60	50
tF		DIOR- data hold	(min)	5	5	5
tG		DIOR-/DIOW- data setup	(min)	100	30	20
tH		DIOW- data hold	(min)	20	15	10
tI		DMACK to DIOR-/DIOW- setup	(min)	0	0	0
tJ		DIOR-/DIOW- to DMACK hold	(min)	20	5	5
tKR		DIOR- negated pulse width	(min)	50	50	25	see note
tKW		DIOW- negated pulse width	(min)	215	50	25	see note
tLR		DIOR- to DMARQ delay	(max)	120	40	35
tLW		DIOW- to DMARQ delay	(max)	40	40	35
tM		CS(1:0) valid to DIOR-/DIOW-	(min)	50	30	25
tN		CS(1:0) hold	(min)	15	10	10
tZ		DMACK- to tri-state	(max)	20	25	25
NOTE	−	t0 is the minimum total cycle time, tD is the minimum command active time, and tK (tKR or tKW, as appropriate)

is the minimum command recovery time or command inactive time. The actual cycle time equals the sum of the actual command active time and the actual command inactive time. The three timing requirements of t0, tD, tK shall be met. The minimum total cycle time requirement, t0, is greater than the sum of tD and tK. This means a host implementation may lengthen either or both tD or tK to ensure that t0 is equal to the value reported in the devices IDENTIFY DEVICE data. A device implementation shall support any legal host implementation.

SpinPoint V40 Product Manual 95