Appendix. Timing Diagrams; Figure 8. Programmed I/O Timing Without Iordy - Seagate Medalist 1270 Product Manual

Medalist 1270 Product Manual, August 1995

Appendix. Timing diagrams

Without IORDY, the drive operates at programmed I/O timing specifica-
tions, as shown below.
Address valid
DIOR− and DIOW−
Write data valid
Read data valid
IOCS16−
T7

Figure 8. Programmed I/O timing without IORDY

Time Description
T0 Cycle time
Drive address (CS1FX–, CS3FX–,
T1
DA0, DA1 and DA2) valid and
DIOR– and DIOW setup
T2 DIOW– or DIOR– pulse width
T3 DIOW– data setup
T4 DIOW– data hold
T5 DIOR– data setup
T6 DIOR– data hold
T7 DIOW– or DIOR– to address valid hold
T8 DIOW– false to write data hold
T9 DIOR– false to read data hold
T5
T1 T3
T2
T0
200 nsec
30 nsec
80 nsec
30 nsec
15 nsec
20 nsec
5 nsec
10 nsec
35
T6
T4
T9 T8
Min Max
—
—
—
—
—
—
— 40 nsec
— 30 nsec