Set Multiple Mode (C6H); Read Dma (C8H/C9H) - Toshiba MK6017MAP Product Specification

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10.8.17 Set Multiple Mode (C6h)

COMMAND CODE
REGISTER SETTING
DR
CY
HD
SN
SC The number of sectors / block
FT
This command enables the drive to perform Read and Write Multiple operations and sets the block count for
these commands.
The Sector Count Register is loaded with the number of sectors per block. The drive supports 1,2,4,8 or16
sectors per block.
Upon receipt of the command, the drive sets BSY=1 and checks the content of Sector Count Register.
If the Sector Count Register contains a valid value and the block count is supported, the value is loaded for
all subsequent Read Multiple and Write Multiple commands. And these commands are enabled to be
executed. If a block count is not supported , this command shall be terminated with the report of an Aborted
Command error , and Read Multiple and Write Multiple commands are disabled.
If the Sector Count Register contains 0 when the command is issued, Read Multiple and Write Multiple
commands are disabled.
In case of software reset, the result depends on the setting of Set Feature command. If FT=66h, the mode
is not changed. If FT = CCh, the mode reverts to power on default (16 sectors).

10.8.18 Read DMA (C8h/C9h)

COMMAND CODE
REGISTER SETTING
DR
CY
HD
SN
SC
FT
LBA
This command is basically identical to Sector command except following features.
Host initialize slave-DMA channel before issuing command.
- Data transfer is initiated by DMARQ and handled by slave-DMA channel in the host.
- Drive issues 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 terminate the command and CY, HD, SN register (LBA
register) shows the sector where error occurred.
- 568 -
1 1 0 0 0 1 1 0
drive no.
1 1 0 0 1 0 0 X
drive no.
starting cylinder
starting head
starting sector
no. of sector to read
staring address
Copyright ©2000 Toshiba corporation. All rights reserved.
REGISTER
NORMAL COMPLETION
no change
no change
no change
no change
no change
no change
REGISTER
NORMAL COMPLETION
no change
last possible
last possible
last possible
00H
no change
last address