Figure 9. Multiword Dma Timing - Seagate Medalist 2520 Product Manual

40
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 9. 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
Medalist 2520 Product Manual, Rev. A
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
TJ
Max
—
—
— —
—
—
—
—
—
—
—
— 35 nsec
— 25 nsec