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SDLT 600 SCSI Interface Guide Chapter 4: SCSI Commands

81-81200-02 REV A01 January 2005 4-213

Table 4-125. One_command Parameter Data — Field Descriptions

Field Description

Support Indicates how the drive supports the requested command. All values other than those listed

are reserved.

Value Description

000b The drive cannot currently return data about the requested command. All

data following byte 1 is invalid. Another request for command data may

be successful.

0001b The drive does not support the requested command. All data following

byte 1 is invalid.

011b The drive supports the requested command as defined in the appropriate

SCSI standards specification. The parameter data after byte 1 is valid.

101b The drive supports the requested command in a vendor-specific manner.

The parameter data after byte 1 is valid.

CDB Size Contains the size in bytes of the data returned in the CDB Usage Data field as well as the

number of bytes in the CDB of the returned command.

CDB

Usage Data

Contains information about the CDB of the returned command. The first byte contains the

operation code of the returned command. If the returned command has a service action, the

service action code is placed in this field in the exact location that the service action code

appears in the returned command CDB. The remaining bytes in this field contain a usage

map of the fields in the CDB of the returned command.

If the drive evaluates a bit, the corresponding bit in this field is set to 1. If the drive ignores

or treats a bit as reserved, the corresponding bit in this field is set to 0. If a field contains

more than one bit, the drive fills all bits in that field with the same value.

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