IBM DTCA-24090 Hard Drive Specifications - Page 49
PIO Timings
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6.5 PIO Timings The PIO cycle timings meet Mode 4 of the ATA-3 description. HCS0, HCS1 +HA0 2 HIOR, HIOW < T1 > < < < T9 > T0 > T2 > < T2I > Write data +HD00 15 < T3 > < T4 > Read data +HD00 15 HIOCS16 +HIORDY > T7 < < T5 > T6Z < T6 > T8 < < TA > > TRD < < TB > PARAMETER DESCRIPTION MIN MAX Note (nsec) (nsec) T0 Cycle time 120 T1 HCS0 1, +HA00 02 valid to HIOR, HIOW active 25 T2 HIOR, HIOW pulse width 70 T2I HIOR, HIOW recovery 25 T3 +HD00 15 setup to HIOW high 20 T4 HIOW high to +HD00 15 hold 10 T5 +HD00 15 setup to HIOR high 20 *1 T6 HIOR high to +HD00 15 hold 5 T6Z HIOR high to +HDOO 15 tristate 30 T7 HCS0 1, +HA00 02 valid to HIOCS16 assertion 30 T8 HCS0 1, +HA00 02 invalid to HIOCS16 negation 30 T9 HIOR, HIOW high to HCS0 1, +HA00 02 hold 10 TRD Read data valid to +HIORDY active 0 TA HIOR, HIOW low to +HIORDY low 35 TB +HIORDY pulse width 1250 Note *1 : This value is applied only when +HIORDY is not negated. When +HIORDY is negated, TRD is applied. Figure 24. PIO cycle timings Electrical Interface Specifications 41