Figure 10. Multiword Dma Timing - Seagate Medalist 1270 Product Manual

Medalist 1270 Product Manual, August 1995
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 TL
TD TK
T0
Min
120 nsec
70 nsec
5 nsec
20 nsec
10 nsec
0 nsec
5 nsec
25 nsec
25 nsec
37
TJ
Max
—
—
— —
—
—
—
—
—
—
—
— 35 nsec
— 25 nsec