IBM IC25N020ATDA04 Hard Drive Specifications - Page 68
Ultra DMA timings, Initiating Read DMA - travelstar 0 driver
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7.9 Ultra DMA timings The Ultra DMA timings meet Mode 0, 1, 2, 3, 4, and 5 of the Ultra DMA Protocol. 7.9.1 Initiating Read DMA 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 tUI tACK tENV tZIORDY tFS tCYC t2CYC tAZ tZAD tDS tDH MODE 0 MODE 1 MODE 2 MODE 3 MODE 4 MODE 5 PARAMETER DESCRIPTION MIN MAX MIN MAX MIN MAX MIN MAX MIN MAX MIN MAX (ns) (ns) (ns) (ns) (ns) (ns) (ns) (ns) (ns) (ns) (ns) (ns) Unlimited interlock time 0 - 0 - 0 - 0 - 0 - 0 - Setup time for DMACKEnvelope time Minimum time before driving IORDY First DSTROBE time Cycle time 20 - 20 - 20 - 20 - 20 - 20 - 20 70 20 70 20 70 20 55 20 55 20 50 0-0-0-0-0-0 - 0 230 0 200 0 170 0 130 0 120 - 90 112 - 73 - 54 - 39 - 25 - 16.8 - Two cycle time 230 - 154 - 115 - 86 - 57 - 38 - Maximum time allowed for output drivers to release - 10 - 10 - 10 - 10 - 10 10 Drivers to assert Data setup time at host 0-0-0-0-0-0 - 15 - 10 - 7 - 7 - 5 - 4.8 - Data hold time at host 5 - 5 - 5 - 5 - 5 - 4.8 - Figure 43. Ultra DMA cycle timing (Initiating Read) Travelstar 48GH, 30GN & 15GN hard disk drive specifications 54