Set Multiple (C6H); Figure 125. Set Multiple Command (C6H) - IBM DTLA-305040 - Deskstar 41.1 GB Hard Drive Specifications

12.30 Set Multiple (C6h)

Command Block Output
Registers
Register
Data
Feature
Sector Count
Sector Number
Cylinder Low
Cylinder High
Device/Head
Command
Error Register
7 6 5
CRC UNC 0
0 0 0

Figure 125. Set Multiple Command (C6h)

The Set Multiple command enables the device to perform Read and Write Multiple commands and estab-
lishes the block size for these commands. The block size is the number of sectors to be transferred for
each interrupt.
If an invalid block size is specified, an Abort error will be returned to the host and Read Multiple and Write
Multiple commands will be disabled.
Output parameters to the device
Sector Count
7 6 5 4 3 2 1 0
- - - - - - - -
- - - - - - - -
V V V V V V V V
- - - - - - - -
- - - - - - - -
- - - - - - - -
1 - 1 D - - - -
1 1 0 0 0 1 1 0
4 3 2 1
IDN 0 ABT T0N AMN
0 0 V 0
The block size to be used for Read Multiple and Write Multiple commands. Valid
block sizes can be selected from 0, 2, 4, 8 or 16. If 0 is specified, then Read
Multiple and Write Multiple commands are disabled.
Deskstar 40GV & 75GXP hard disk drive specifications
Command Block Input
Register
Data
Error
Sector Count
Sector Number
Cylinder Low
Cylinder High
Device/Head
Status
Status Register
0 7 6 5
BSY RDY DF
0 0 V 0
163
Registers
7 6 5 4 3 2 1 0
- - - - - - - -
see below
- - - - - - - -
- - - - - - - -
- - - - - - - -
- - - - - - - -
- - - - - - - -
see below
4 3 2 1
DSC DRQ COR IDX
– – 0 –
0
ERR
V