
Deskstar 7K160 Hard Disk Drive Specification
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12.4 Download Microcode (92h)
Table 77: Downlad Microcode Command (92h)
This command enables the host to alter the device's microcode. The data transferred using the DOWNLOAD
MICROCODE commands is vendor specific.
All transfers shall be an integer multiple of the sector size. The size of the data transfer is determined by the con-
tents of the Sector Number and Sector Count registers. The Sector Number register is used to extend the Sector
Count register to create a 16-bit sector count value. The Sector Number register is the most significant eight bits
and the Sector Count register is the least significant eight bits. A value of zero in both the Sector Number and Sec-
tor Count registers shall indicate no data is to be transferred.
ABT will be set to 1 in the Error Register if the value in the Feature register is not 07h or the device is in Security
Locked mode.
When the reload of new microcode is requested in the data sent by the host for this Download command, UNC
error will be set to 1 in the Error Register if the device fails to reload new microcode. This error is reported only
when the reload of microcode is requested.
Command Block Output Registers
Command Block Input Registers
Register
7 6 5 4 3 2 1 0
Register
7 6 5 4 3 2 1 0
Data
- - - - - - - -
Data
- - - - - - - -
Feature
0 0 0 0 0 1 1 1
Error
see below
Sector Count
Sector_Count(00-
07)
Sector Count
- - - - - - - -
Sector Number
Sector_Count(08-
15)
Sector Number
- - - - - - - -
Cylinder Low
- - - - - - - -
Cylinder Low
- - - - - - - -
Cylinder High
- - - - - - - -
Cylinder High
- - - - - - - -
Device/Head
- - - D - - - -
Device/Head
- - - - - - - -
Command
1 0 0 1 0 0 1 0
Status
see below
Error Register
Status Register
7
6
5
4
3
2
1
0
7
6
5
4
3
2
1
0
CRC
UNC
0
IDN
0
ABT
T0N
AMN
BSY RDY
DF
DSC
DRQ
COR IDX
ERR
0
V
0
0
V
V
0
0
0
1
0
1
0
0
-
V
Output Parameters To The Device
Feature
Subcommand code.
03h: Download and save microcode with offsets
07h: Download and save microcode.
other values are reserved.
Sector Count
Lower byte of 16-bit sector count value to transfer from the
host.
Sector Number
Higher byte of 16-bit sector count value to transfer from the
host.
Cylinder
Buffer offset (only used for Feature = 03h)
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