Chapter 2 — Decoder Command Set Guide
45
INQUIRY Command
INQUIRY Command
(OpCode 0x12, 6 bytes)
The
INQUIRY
command allows the initiator (host adapter) to determine the kind of
SCSI devices attached to its SCSI Bus. It causes a device that is attached to a
SCSI bus to return information about itself. Since the function of the SCSI decod-
er does not fit into any of the standard SCSI device types, a new device type has
been defined. The function of the MPEG decoder is similar to a Direct Access
Storage Device, e.g., a hard disk, but also has characteristics of a CD-ROM. The
MPEG decoder can be viewed as a write-only device.
The decoder can provide two categories of data in response to an
INQUIRY
com-
mand: Standard Inquiry Data and Vital Product Data. Standard Inquiry Data
contains basic data about the decoder, and Vital Product Data comprise several
pages of additional data. Each Vital Product Data page requires a separate
INQUIRY
command from the initiator.
EVPD
Enable Vital Product Data. If 0, the decoder returns the Standard Inquiry Data
page; if 1, the decoder returns the Vital Product page specified in Page Code.
Page Code
Specifies the Vital Product Data page to be returned.
Allocated Length
Specifies the number of bytes of inquiry
information to be returned to the initiator.
Table 2-3. INQUIRY Command Descriptor Block
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