Appendix. Timing Diagrams; Figure 8. Programmed I/O Timing Without Iordy; Time Description; T0 Cycle Time - Seagate Medalist 1640 Product Manual

Medalist 1640 and 2140 Product Manual, January 1996

Appendix. Timing diagrams

The ST31640A and ST32140A are designed to comply with and can
exceed the ATA-2 timing standards. Performance in excess of the ATA-2
standard depends on the capability of the host-system environment. See
your Seagate representative for additional details.
Without IORDY, the drive operates at programmed I/O timing specifica-
tions, as shown below.

Figure 8. Programmed I/O timing without IORDY

Time
T0 Cycle time
Drive address (CS1FX--, CS3FX--,
T1
DA0, DA1 and DA2) valid and
DIOR--/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 I/OCS16-- is
T7
asserted
T8 Address invalid to I/OCS16-- tristate
T9 DIOR-- false to address valid hold
Description
35
Min Max
120 nsec ----
25 nsec ----
70 nsec ----
20 nsec ----
10 nsec ----
20 nsec ----
5 nsec ----
---- ----
---- ----
10 nsec ----