Figure 12. Multiword Dma Timing - Seagate ST3655 Series Product Manual

ST3655 Family AT Drives Product Manual, Rev. A
The drive operates at mode 1 multiword DMA timing specifications, as
shown below.
DMARQ
DMACK−
DIOR− or DIOW−
Read data valid
Write data valid
TI

Figure 12. Multiword DMA timing

Time Description
T0 Cycle time
TD DIOW– or DIOR– pulse width (16-bit)
TE DIOR– data access
TF DIOW– data hold
TG DIOR– 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
180 nsec
80 nsec
5 nsec
30 nsec
15 nsec
0 nsec
5 nsec
60 nsec
60 nsec
33
TJ
Min Max
—
—
— 60 nsec
—
—
—
—
—
—
—
— 120 nsec
— 40 nsec