Deskstar T7K500 Hard Disk Drive Specification
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12.4 Download Microcode (92h)
Table 75: 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.
In reloading new microcode, the device does DASP handshake in reloading new microcode. Thus the device does
not recognize the slave device even though it exists. Also when the spin-up of the device is disabled, the device
spins down after reloading new microcode.
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
7654321 0 76543 21 0
CRC UNC 0 IDN 0 ABT T0N AMN BSY RDY DF DSC DRQ COR IDX ERR
0V00VV0 0 01010 0- V
Output Parameters To The Device
Feature
Subcommand code.
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.
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