Device Pausing Write Dma; Figure 48. Ultra Dma Cycle Timings (Device Pausing Write) - IBM IC25N020ATDA04 - Travelstar 20 GB Hard Drive Specifications

7.9.6

Device Pausing Write DMA

DMARQ
DMACK-
STOP
DDMARDY-
HSTROBE
PARAMETER DESCRIPTION
tSR HSTROBE to DDMARDY- time
tRFS DDMARDY- to final HSTROBE
time
Note: When a device does not satisfy the tSR timing, the device is ready to receive two more data words
after DDMARDY- is negated.

Figure 48. Ultra DMA cycle timings (Device Pausing Write)

tSR
MODE 0
MIN
(ns)
–
–
Travelstar 48GH, 30GN & 15GN hard disk drive specifications
tRFS
MODE 1 MODE 2
MAX MIN MAX MIN MAX
(ns) (ns) (ns) (ns) (ns)
50 – 30 – 20
75 – 70 – 60
59
MODE 3 MODE 4 MODE 5
MIN MAX MIN MAX MIN
(ns) (ns) (ns) (ns) (ns)
– – – – –
– 60 – 60 –
MAX
(ns)
–
50