Figure 10. Multiword Dma Timing - Seagate Medalist SL Product Manual

Medalist SL Family Product Manual, June 1996
The drive operates at multiword DMA mode 2 timing specifications, as
shown below.
DMARQ
DMACK−
DIOR− or DIOW−
Read data valid
Write data valid
TI

Figure 10. Multiword DMA timing

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
TE TF
TG TH
TD TK
T0
120 nsec
70 nsec
5 nsec
20 nsec
10 nsec
0 nsec
5 nsec
25 nsec
25 nsec
37
TL
TJ
Min Max
—
—
— 30 nsec
—
—
—
—
—
—
—
— 30 nsec
— 30 nsec