Download Microcode (92H); Table 78.Downlad Microcode Command (92H) - Hitachi 7K80 - Deskstar - Hard Drive Specifications

12.4 Download Microcode (92h)

Table 79: Downlad Microcode Command (92h)
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 IDN
0 V 0
Output Parameters To The Device
Feature
Sector Count
Sector Number
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.
In reloading new microcode, the device does not preserve its state and settings but reset them just like the device is
executing a power-on. For instance, the device does DASP handshake in reloading new microcode. Thus the
7 6 5 4 3 2 1 0
- - - - - - - -
0 0 0 0 0 1 1 1
Sector_Count(00-
07)
Sector_Count(08-
15)
- - - - - - - -
- - - - - - - -
- - - D - - - -
1 0 0 1 0 0 1 0
4 3 2 1 0
0 ABT T0N AMN
0 V V 0 0
Subcommand code. Only support 07h which indicates that save
downloaded code for immediate and future use.
Lower byte of 16-bit sector count value to transfer from the
host.
Higher byte of 16-bit sector count value to transfer from the
host.
Deskstar 7K80 Hard Disk Drive Specification
Command Block Input Registers
Register
Data
Error
Sector Count
Sector Number
Cylinder Low
Cylinder High
Device/Head
Status
Status Register
7 6 5 4
BSY RDY DF DSC DRQ
0 1 0 1
127
7 6 5 4 3 2 1 0
- - - - - - - -
see below
- - - - - - - -
- - - - - - - -
- - - - - - - -
- - - - - - - -
- - - - - - - -
see below
3 2 1 0
COR IDX ERR
0 0 - V