Hitachi 7K400 Specifications - Page 49
Ultra DMA timings
UPC - 000053412935
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6.8 Ultra DMA timings The Ultra DMA timings meet Mode 0, 1, 2, and 4 of the Ultra DMA Protocol. 6.8.1 Initiating Read DMA Table 26: Ultra DMA cycle timing chart (Initiating Read) DMARQ DMACKSTOP HDMARDY- tUI tACK tENV tACK tENV tZIORDY DSTROBE tAZ DD(15:0) xxxxxxxxxxxxxxxxxxxxxxxxxxx Host drives DD t2CYC tFS tCYC tCYC tZAD tDS tDH xxx RD Data xxxx RD Data xxx RD Data Device drives DD Table 27: Ultra DMA cycle timings (Initiating Read) 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 output 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 7K400 Hard Disk Drive Specification 35