Seagate 6450, 6451 manual Appendix. Timing diagrams, Time Description Min Max

Medalist Pro 6450/6451 Product Manual, Rev. B 37

Appendix. Timing diagrams

Without IORDY, the drives operate at programmed I/O timing specifica- tions, as shown below.

Address valid

DIOR− and DIOW−

Write data valid

Read data valid

IOCS16−

T7			T5	T6
	T1		T3	T4
		T2		T9	T8
			T0

Figure 8. Programmed I/O timing without IORDY

Time	Description	Min	Max
T0	Cycle time	200 nsec	—
T1	Drives address (CS1FX–, CS3FX–,	30 nsec	—
	DA0, DA1 and DA2) valid and
	DIOR– and DIOW setup
T2	DIOW– or DIOR– pulse width	80 nsec	—
T3	DIOW– data setup	30 nsec	—
T4	DIOW– data hold	15 nsec	—
T5	DIOR– data setup	20 nsec
T6	DIOR– data hold	5 nsec	—
T7	DIOW– or DIOR– to address valid hold	—	40 nsec
T8	DIOW– false to write data hold	—	30 nsec
T9	DIOR– false to read data hold	10 nsec