Table 113.Set Multiple Command (C6H); Set Multiple (C9H) - Hitachi 7K250 - Deskstar - Hard Drive Specifications

12.40 Set Multiple (C9h)

Table 114: Set Multiple command (C6h)
Command Block Output Registers
Register
Data
Feature
Sector Count
Sector Number
Cylinder Low
Cylinder High
Device/Head
Command
7 6 5
CRC UNC 0
0 0 0
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. The 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
Error Register
4 3 2 1
IDN 0 ABT T0N AMN
0 0 V 0
This indicates the block size to be used for the Read Multiple and the Write Multiple com-
mands. Valid block sizes can be selected from 0, 1, 2, 4, 8, or 16. If 0 is specified, then the
Read Multiple and the Write Multiple commands are disabled.
Deskstar 7K250 Hard Disk Drive Specification
Command Block Input Registers
Register
Data
Error
Sector Count
Sector Number
Cylinder Low
Cylinder High
Device/Head
Status
0 7 6
BSY RDY DF DSC DRQ
0 0 V
184
7 6 5 4 3 2 1 0
- - - - - - - -
see below
- - - - - - - -
- - - - - - - -
- - - - - - - -
- - - - - - - -
- - - - - - - -
see below
Status Register
5 4 3 2
COR IDX
0 - - 0
1 0
ERR
- V