Product specifications

360073945

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10.6.11 Command Register

RegH2D

FIS bit position Dword 1: 23:16

The command register accepts commands for the drive to perform fixed disk operations. Commands are

executed when the Shadow Block Registers are loaded and the command register is written and only when:

The status is not busy (BSY is inactive).

and

DRDY (drive ready) is active.

Any code NOT defined in the following list causes an Aborted Command error. Interrupt request (INTRQ)

is reset when a command is written. The following are acceptable commands to the command register.