IBM DTLA-307075 Hard Drive Specifications - Page 43
Multiword DMA timings, The Multiword DMA timing meets Mode 2 of the ATA/ATAPI-4 description.
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7.2.3 Multiword DMA timings The Multiword DMA timing meets Mode 2 of the ATA/ATAPI-4 description. CS0-/CS1- tM tN DMARQ tL DMACKDIOR-/DIOWREAD DATA WRITE DATA t0 tI tD tK tG tF tG tH Figure 24. Multiword DMA cycle timing chart tJ tZ PARAMETER DESCRIPTION t0 Cycle time tD DIOR-, DIOW- pulse width tE DIOR- data access tF DIOR- data hold tG DIOR-/DIOW- data setup tH DIOW- data hold tI DMACK- to -DIOR/-DIOW setup tJ DIOR-/DIOW- to DMACK- delay tK DIOR-/DIOW- negated pulse width tL DIOR-/DIOW- to DMARQ- delay tM CS (1:0) valid to DIOR-/DIOW- tN CS (1:0) hold tZ -DMACK to tristate Figure 25. Multiword DMA cycle timings MIN (ns) 120 70 50 5 20 10 0 5 25 - 25 10 - MAX (ns) 35 - - 25 Deskstar 40GV & 75GXP hard disk drive specifications 31
7.2.3 Multiword DMA timings
The Multiword DMA timing meets Mode 2 of the ATA/ATAPI-4 description.
WRITE DATA
READ DATA
DMACK-
DMARQ
DIOR-/DIOW-
t0
tL
tJ
tI
tD
tK
tF
tG
tH
tG
tZ
CS0-/CS1-
tM
tN
Figure 24. Multiword DMA cycle timing chart
25
–
–DMACK to tristate
tZ
–
10
CS (1:0) hold
tN
–
25
CS (1:0) valid to DIOR–/DIOW–
tM
35
–
DIOR–/DIOW– to DMARQ– delay
tL
–
25
DIOR–/DIOW– negated pulse width
tK
–
5
DIOR–/DIOW– to DMACK- delay
tJ
–
0
DMACK– to –DIOR/–DIOW setup
tI
–
10
DIOW– data hold
tH
–
20
DIOR–/DIOW– data setup
tG
–
5
DIOR– data hold
tF
–
50
DIOR– data access
tE
–
70
DIOR–, DIOW– pulse width
tD
–
120
Cycle time
t0
MAX (ns)
MIN (ns)
PARAMETER DESCRIPTION
Figure 25. Multiword DMA cycle timings
Deskstar 40GV & 75GXP hard disk drive specifications
31