Hitachi T7K250 Specifications - Page 49
Ultra DMA timings - deskstar drivers
UPC - 000062373678
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6.10 Ultra DMA timings The Ultra DMA timings meet Mode 0, 1, 2, and 4 of the Ultra DMA Protocol. 6.10.1 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 PARAMETER DESCRIPTION (all values in ns) MODE 0 MIN MAX tUI Unlimited interlock time 0 - tACK Setup time for DMACK- 20 - tENV Envelope time 20 70 tZIORDY Minimum time before driving IORDY 0 - tFS First DSTROBE time 0 230 tCYC Cycle time 112 - t2CYC Two cycle time 230 - tAZ Maximum time allowed for output drivers to release - 10 tZAD Drivers to assert 0- tDS Data setup time at host 15 - tDH Data hold time at host 5- Time from data ouput tDZFS released-to-driving until the 70 - first transition of critical timing MODE 1 MIN MAX 0 - 20 - 20 70 0 - 0 200 73 - 154 - - 10 0- 10 - 5- 48 - MODE 2 MIN MAX 0 0 20 - 20 70 0 - 0 170 54 - 115 - - 10 0- 7- 5- 31 - MODE 3 MIN MAX 0 - 20 - 20 55 0 - 0 130 39 - 86 - - 10 0- 7- 5- 20 - MODE 4 MIN MAX 0 - 20 - 20 55 0 - 0 120 25 - 57 - - 10 0- 5- 5- 6.7 - MODE 5 MIN MAX 0 - 20 - 20 50 0 - - 90 17 - 38 - 10 0- 4.8 - 4.8 - 25 - Deskstar T7K250 Hard Disk Drive Specification 35