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10.8.42.6.2.3 Command data structure

The fifth command data structure will contain the command or reset for which the error is being reported. The fourth command data structure should contain the command or reset that preceded the command or reset for which the error is being reported, the third command data structure should contain the command or reset preceding the one in the fourth command data structure, etc. If fewer than four commands and resets preceded the command or reset for which the error is being reported, the unused command data structures will be zero filled, for example, if only three commands and resets preceded the command or reset for which the error is being reported, the first command data structure will be zero filled. In some devices, the hardware implementation may preclude the device from reporting the commands that preceded the command for which the error is being reported or that preceded a reset. In this case, the command data structures are zero filled.

If the command data structure represents a command or software reset, the content of the command data structure will be as shown in the following Table.

 

Command data structure

Byte

Descriptions

n

Content of the Device Control register when the Command register was written.

n+1

Content of the Features register when the Command register was written.

n+2

Content of the Sector Count register when the Command register was written.

n+3

Content of the Sector Number register when the Command register was written.

n+4

Content of the Cylinder Low register when the Command register was written.

n+5

Content of the Cylinder High register when the Command register was written.

n+6

Content of the Device/Head register when the Command register was written.

n+7

Content written to the Command register.

n+8

Timestamp

n+9

Timestamp

n+10

Timestamp

n+11

Timestamp

Timestamp shall be the time since power-on in milliseconds when command acceptance occurred. This timestamp may wrap around.

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