ANSI INCITS 468

Abstract

This standard defines a set of SCSI command descriptor blocks that are useful in accessing and controlling devices with a peripheral device type set to 5. <br>This command set is transport independent and may be implemented across a wide variety of environments for which a SCSI transport protocol has been defined. To date, these include Parallel SCSI, ATA/ATAPI, Serial ATA, Universal Serial Bus, and High Performance Serial Bus. <br>The command set described has been selected for correct operation when the physical interface is ATA with the ATAPI command protocol. Although some commands are also described in [SPC-3], reduced descriptions are also in this standard for the purpose of profiling mandatory and optional command features as applied to multimedia devices. <br>The objective of this command set is to provide for the following: <br>1. A definition of the command formats and functions independent of delivery, protocol/signaling or transport mechanism. Architectural constraints regarding command functions, over the various transports, are addressed in the document specific to the physical transport; <br>2. Standardized access to common features of devices employed in multi-media applications; <br>3. System software/firmware independence across device classes and physical interfaces. Provision is made for the addition of special features and functions through the use of vendor-specific options; <br>4. Compatibility such that properly conforming devices may inter-operate with subsequent devices. The Multi-Media Commands - 6 (MMC-6) standard is divided into several clauses: <br>Clause 1 (this clause) is the scope. <br>Clause 2 contains lists of documents that may be needed by the reader for the correct understanding of this standard. <br>Clause 3 contains Definitions, Symbols, Abbreviations, and Conventions. This is a glossary of terminology used in this standard. <br>Clause 4 describes modeling for the various media-oriented behaviors that the Host may witness from the device. This also provides an overview of internal drive operation to the Host application developer. <br>Clause 5 defines the features and profiles of MMC devices. Features describe Drive capability while profiles define a general device view. <br>Clause 6 defines commands that may be implemented by MMC device. Commands are described from the Host's point of view. <br>Clause 7 defines the parameter data formats that may be implemented by MMC devices. Inputs required by the drive are not always a part of a command. Inputs associated with mode of operation are readable and sometimes writable. <br>The annexes provide information to assist with implementation of this standard.