Appendix. Timing Diagrams; Figure 10. Programmed I/O Timing Without Iordy - Seagate Decathlon 850 Product Manual

Decathlon 850 ATA Product Manual, July 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−

Figure 10. Programmed I/O timing without IORDY

Time
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
Address valid until IOCS16– is
T7
asserted
T8 Address invalid to IOCS16– tristate
T9 DIOR– false to read data hold
T7
T1
T2
Description
35
T5 T6
T3 T4
T9 T8
T0
Min Max
240 nsec —
25 nsec —
70 nsec —
20 nsec —
10 nsec —
20 nsec —
5 nsec —
— 20 nsec
— 5 nsec
— 20 nsec