IBM DBCA-204860 Hard Drive Specifications - Page 49
DMA Timings Multiword
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6.5.2 DMA Timings (Multiword) The Multiword DMA timing meets Mode 2 of the ATA-3 description. +DMARQ DMACK DIOR/ DIOW READ DATA WRITE DATA < TL > < T0 > > TI < TD > < TK > < TE> TF < > TJ < > TZ < < TG > TH < PARAMETER DESCRIPTION T0 Cycle time TD DIOR, DIOW pulse width TE DIOR data setup TF DIOR data hold TG DIOW data setup TH DIOW data hold TI DMACK to DIOR/ DIOW setup TJ DIOR/ DIOW to DMACK hold TK DIOR/ DIOW nagated pulse width TL DIOR/ DIOW to DMARQ delay TZ DMACK to tristate Figure 27. D M A (Multi Word) cycle timings MIN MAX Note (nsec) (nsec) 120 70 20 5 20 10 0 5 25 35 25 Electrical Interface Specifications 41
6.5.2
DMA Timings (Multiword)
The Multiword DMA timing meets Mode 2 of the ATA-3 description.
+DMARQ
< TL >
DMACK
<
T0
>
> TJ <
> TI <
TD
><
TK
>
DIOR/ DIOW
< TE> TF <
> TZ <
READ DATA
<
TG
> TH <
WRITE DATA
PARAMETER DESCRIPTION
MIN
MAX
Note
(nsec) (nsec)
T0
Cycle time
120
TD
DIOR, DIOW pulse width
70
TE
DIOR data setup
20
TF
DIOR data hold
5
TG
DIOW data setup
20
TH
DIOW data hold
10
TI
DMACK to
DIOR/ DIOW setup
0
TJ
DIOR/ DIOW to
DMACK hold
5
TK
DIOR/ DIOW nagated pulse width
25
TL
DIOR/ DIOW to
DMARQ delay
35
TZ
DMACK to tristate
25
Figure 27. DMA (Multi Word) cycle timings
Electrical Interface Specifications
41