Command Code Format

The first field in a message header is a 32-bit command specifier. This command field is broken down into three subfields: Operation, class, and a response identifier.

typedef struct _command_fmt

{

    UINT32      Operation : 23;

    UINT32      IsResponse : 1;

    UINT32      Class : 8;

} COMMAND_FMT;

 

Field

Value or Description

Operation

Bits 22:0 describe the operation associated with message.

IsResponse

Bit 23 is set if message is a response, else it is clear.

Class

Bits 31:24 describe the class, or command group.

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