Hitachi HDT725025VLA380 Specifications - Page 46
Ultra DMA timings - driver
UPC - 829686001084
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6.9 Ultra DMA timings The Ultra DMA timings meet Mode 0, 1, 2, and 4, 5 and 6 of the Ultra DMA Protocol. 6.9.1 Initiating Read DMA DMARQ DMACKSTOP HDMARDYDSTROBE DD(15:0) tUI tACK tENV tACK tENV tZIORDY tAZ xxxxxxxxxxxxxxxxxxxxxxxxxxx Host drives DD t2CYC tFS tCYC tCYC tZAD tDS tDH xxx RD Data xxxx RD Data xxx RD Data Device drives DD Table 20: Ultra DMA cycle timings (Initiating Read) PARAMETER MODE 0 MODE 1 MODE 2 MODE 3 MODE 4 MODE 5 MODE 6 DESCRIPTION MIN MAX MIN MAX MIN MAX MIN MAX MIN MAX MIN MAX MIN MAX (all values in ns) tUI Unlimited interlock time 0 - 0 - 0 0 0 - 0 - 0 - 0 - tACK Setup time for DMACK- 20 - 20 - 20 - 20 - 20 - 20 - 20 - tENV Envelope time 20 70 20 70 20 70 20 55 20 55 20 50 20 50 tZI- Minimum time before ORDY driving IORDY 0-0-0-0-0-0-0- tFS First DSTROBE time 0 230 0 200 0 170 0 130 0 120 - 90 0 80 tCYC Cycle time 112 - 73 - 54 - 39 - 25 - 17 - 13 - t2CYC Two cycle time 230 - 154 - 115 - 86 - 57 - 38 - 29 - tAZ Maximum time allowed for output drivers to - 10 - 10 - 10 - 10 - 10 10 - 10 release tZAD Drivers to assert 0-0-0-0-0-0-0- tDS Data setup time at host 15 - 10 - 7 - 7 - 5 - 4.8 - 2.6 - tDH Data hold time at host 5 - 5 - 5 - 5 - 5 - 4.8 - 3.5 - tDZFS Time from data ouput released-to-driving until the first transition of crit- 70 - 48 - 31 - 20 - 6.7 - 25 - 17.5 - ical timing Deskstar T7K500 Hard Disk Drive Specification 32