IBM DBCA-204860 Hard Drive Specifications - Page 50
Ultra DMA Timings
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6.5.3 Ultra DMA Timings The Ultra DMA timing meets Mode 0, 1 and 2 of the Ultra DMA/33 -- a Proposal for a New Protocol in ATA/ATAPI-4 (X3T13/D96153 Revision 1) 6.5.3.1 Initiating Read DMA DMARQ < Tui > DMACK STOP HDMARDY < T2cyc > Tzrdy > < < Tfs > < Tcyc > < Tcyc > DSTROBE Taz < > < > Tzad > Tdvs Tdvh < DD(15:00) XXXXXXXXXXXXXXX XXX RD Data XXX RD Data XXX RD Data > < Host drives DD Device drives DD PARAMETER DESCRIPTION Tui Tack Tenv Tzrdy Tfs Tcyc T2cyc Taz Tzad Tdvs Tdvh Unlimited interlock time Setup time before DMACK assertion Envelope time Wait time before driving DSTROBE First strobe time Cycle Time 2 Cycle time Output release time Output enable time Data setup time (at device side) Data Hold time (at device side) Figure 28. Ultra D M A cycle timings (Initiating Read) [nsec] MODE0 MODE1 MODE2 MIN MAX MIN MAX MIN MAX 0 0 0 20 20 20 20 70 20 70 20 70 0 0 0 0 230 0 200 0 170 114 75 55 235 156 117 10 10 10 0 0 0 70 48 34 6 6 6 42 OEM Specifications of DBCA-2xxxxx 2.5 inch H D D