Figure 10. Multiword Dma Timing - Seagate Medalist Pro Family Product Manual

Medalist Pro 6450/6451 Product Manual, Rev. B
The drives operate 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 TL
TD TK
T0
Min
120 nsec
70 nsec
5 nsec
20 nsec
10 nsec
0 nsec
5 nsec
25 nsec
25 nsec
39
TJ
Max
—
—
— —
—
—
—
—
—
—
—
— 35 nsec
— 25 nsec