IBM DJSA-210 Hard Drive Specifications - Page 62
Multiword DMA timings, WRITE DD15:0, READ DD15:0, DMACK, DMARQ, DIOR-/DIOW, tLR/tLW
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7.8 Multiword DMA timings The Multiword DMA timings meet Mode 2 of the ATA-3 description. DMARQ DMACKDIOR-/DIOWREAD DD(15:0) WRITE DD(15:0) tLR/tLW t0 tI tD tKR/tKW tG tF tG tH tJ tZ t0 tD tE tF tG tH tI tJ tKR/tKW tLR/tLW tZ PARAMETER DESCRIPTION Cycle time DIOR-/DIOW- asserted pulse width DIOR- data access DIOR- data hold DIOR-/DIOW- data setup DIOW- data hold DMACK- to DIOR-/DIOW- setup DIOR-/DIOW- to DMACK- hold DIOR- negated pulse width / DIOW- negated pulse width DIOR- to DMARQ delay / DIOW- to DMARQ delay DMACK- to read data released Figure 37. Multiword DMA cycle timings MIN (ns) MAX (ns) 120 - 70 - - 50 5 - 20 - 10 - 0 - 5 - 25 - - 35 - 25 Travelstar 32GH/30GT/20GN hard disk drive specifications 48
7.8
Multiword DMA timings
The Multiword DMA timings meet Mode 2 of the ATA-3 description.
WRITE DD(15:0)
READ DD(15:0)
DMACK-
DMARQ
DIOR-/DIOW-
t0
tLR/tLW
tJ
tI
tD
tKR/tKW
tF
tG
tH
tG
tZ
25
–
DMACK- to read data released
tZ
35
–
DIOR- to DMARQ delay / DIOW- to DMARQ delay
tLR/tLW
–
25
DIOR- negated pulse width / DIOW- negated pulse width
tKR/tKW
–
5
DIOR-/DIOW- to DMACK- hold
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- asserted pulse width
tD
–
120
Cycle time
t0
MAX (ns)
MIN (ns)
PARAMETER DESCRIPTION
Figure 37. Multiword DMA cycle timings
Travelstar 32GH/30GT/20GN hard disk drive specifications
48