IBM DJSA-210 Hard Drive Specifications - Page 63
Ultra DMA timings, Initiating Read DMA
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7.9 Ultra DMA timings The Ultra DMA timings meet Mode 0, 1, 2, 3, and 4 of the Ultra DMA Protocol. 7.9.1 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 tUI tACK tENV tZIORDY tFS tCYC t2CYC tAZ tZAD tDS tDH PARAMETER DESCRIPTION Unlimited interlock time Setup time for DMACKEnvelope time Minimum time before driving IORDY First DSTROBE time Cycle time Two cycle time Maximum time allowed for output drivers to release Drivers to assert Data setup time at host Data hold time at host MODE 0 MODE 1 MODE 2 MODE 3 MODE 4 MIN MAX MIN MAX MIN MAX MIN MAX MIN MAX (ns) (ns) (ns) (ns) (ns) (ns) (ns) (ns) (ns) (ns) 0-0-0-0-0- 20 - 20 - 20 - 20 - 20 - 20 70 20 70 20 70 20 55 20 55 0-0-0-0-0- 0 230 0 200 0 170 0 130 0 120 112 - 73 - 54 - 39 - 25 - 230 - 154 - 115 - 86 - 57 - - 10 - 10 - 10 - 10 - 10 0-0-0-0-0- 15 - 10 - 7 - 7 - 5 - 5-5-5-5-5- Figure 38. Ultra DMA cycle timing (Initiating Read) Travelstar 32GH/30GT/20GN hard disk drive specifications 49