Seagate Medalist 1640, Руководство по эксплуатации продукта

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When using IORDY, the drive operates at programmed timing specifica-
tions, as shown below.
Time Description Min Max
T0 Cycle time 120 nsec ----
T1 Address valid until IOCS16-- is asserted ---- 20 nsec
T2
Drive address (CS1FX--, CS3FX--,
DA0, DA1 and DA2) valid before DIOR--
or DIOW-- setup
25 nsec ----
T3 IORDY setup time ---- 25 nsec
T4
DIOW-- or DIOR-- pulse width (8-bit) 70 nsec ----
DIOW-- or DIOR-- pulse width (16-bit) 70 nsec ----
T5 IORDY pulse width ----
1,250
nsec
T6 DIOW-- data setup 20 nsec ----
T7 DIOR-- data setup 20 nsec ----
T8 DIOR-- data hold 5 nsec ----
T9 DIOW-- data hold 10 nsec ----
T10 DIOW-- or DIOR-- to address valid hold 5 nsec ----
T11
Address invalid until IOCS16-- is
negated
---- 5 nsec
Figure 9. Programmed I/O timing with IORDY
36 Medalist 1640 and 2140 Product Manual, January 1996