Filter
Top Products
360014937
Copyright © 2000 Toshiba corporation. All rights reserved.
-
569 -
10.8.19 Write DMA (CAh/CBh)
COMMAND CODE
1 1 0 0 1 0 1 X
REGISTER
REGISTER SETTING NORMAL COMPLETION
DR drive no. no change
CY starting cylinder last possible
HD starting head last possible
SN starting sector last possible
SC no. of sector to write 00H
FT no change
LBA staring address last address
This command is basically identical to Sector command except following differences.
•
Host initialize slave-DMA channel before issuing command.
- Data transfer is initiated by DMARQ and handled by slave-DMA channel in the host.
- Drive issue only one interrupt at the completion of each command to show the status is valid after data
transfer.
During DMA transfer phase, either BSY or DRQ is set to 1.
When a command is completed, CY, HD, SN register (LBA register) shows the sector transferred the latest.
If the drive detects unrecoverable error, the drive terminates the command and CY, HD, SN register (LBA register)
shows the sector where error has occurred.