Multiword Dma Timings; Figure 42. Multiword Dma Cycle Timings - IBM IC25N020ATDA04 - Travelstar 20 GB Hard Drive Specifications

7.8

Multiword DMA timings

The Multiword DMA timings meet Mode 2 of the ATA-5 description.
DMARQ
DMACK-
DIOR-/DIOW-
READ DD(15:0)
WRITE DD(15:0)
PARAMETER DESCRIPTION
t0 Cycle time
tD DIOR-/DIOW- asserted 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- hold
tKR/tKW DIOR- negated pulse width / DIOW- negated pulse
width
tLR/tLW DIOR- to DMARQ delay / DIOW- to DMARQ delay
tZ DMACK- to read data released

Figure 42. Multiword DMA cycle timings

tI
tE
Travelstar 48GH, 30GN & 15GN hard disk drive specifications
tLR/tLW
t0
tKR/tKW
tD
tG
tF
tG
tH
53
tJ
MIN (ns) MAX (ns)
120 –
70 –
– 50
5 –
20 –
10 –
0 –
5 –
25 –
– 35
– 25
tZ