Decathlon 850 ATA Product Manual, July 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
Figure 12. 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
TI
TD
TK
T0
37
TL
TJ
Min
Max
120 nsec
—
70 nsec
—
—
—
5 nsec
—
20 nsec
—
10 nsec
—
0 nsec
—
5 nsec
—
25 nsec
—
25 nsec
—
—
35 nsec
—
25 nsec