Figure 10. Programmed I/O Timing With Iordy; Nsec - Seagate Medalist 1640 Product Manual

Medalist 1640 and 2140 Product Manual, January 1996
The drive operates at multiword DMA mode 2 timing specifications, as
shown below.

Figure 10. Programmed I/O timing with IORDY

Time Description
T0 Cycle time
TD DIOW-- or DIOR-- pulse width (16-bit)
TE DIOR-- data access
TF DIOR-- data hold
TG DIOW-- data setup
TH DIOW-- data hold
TI DMACK-- to DIOR-- or DIOW-- setup
TJ DIOR-- or DIOW-- to DMACK-- hold
TK DIOR-- negated pulse width
R
TK DIOW-- negated pulse width
W
TL DIOR-- to DMARQ delay
R
TL DIOW-- to DMARQ delay
W
37
Min Max
120 nsec ----

70 nsec

----
---- 30 nsec
5 nsec ----
20 nsec ----
10 nsec ----
0 nsec ----
5 nsec ----
25 nsec ----
25 nsec ----
---- 30 nsec
---- 30 nsec