ISO/IEC 14776-113:2002 信息技术-小型计算机系统界面-第13部分：并行接口-3

标准编号：ISO/IEC 14776-113:2002

中文名称：信息技术-小型计算机系统界面-第13部分：并行接口-3

英文名称：Information technology — Small Computer System Interface (SCSI) — Part 113: Parallel Interface-3 (SPI-3)

发布日期：2002-08

标准范围

SCSI协议旨在提供高效的对等I/O总线，其主机和外围设备的最大数量由总线宽度（8或16）决定。数据可以异步或同步传输，传输速率主要取决于设备实现和电缆长度。SCSI是一种I/O接口，可在多种介质和传输速率下运行。SCSI中并行接口的目标是:a） 在一类设备中为主机提供设备独立性。因此，可以将不同的磁盘驱动器、磁带驱动器、打印机、光盘驱动器和其他SCSI设备添加到主机，而无需修改通用系统硬件。b） 提供兼容性，以便在正确完成系统工程的情况下，符合SCSI-2和SPI-2标准的设备可以与SPI-3设备互操作。符合标准的SCSI-2和SPI-2设备应以可接受的方式响应，以拒绝SPI-3协议扩展。SPI-3协议扩展旨在允许此类拒绝，从而允许SCSI-2和SPI-2设备在不需要使用扩展的情况下继续运行。本国际标准增强了SPI-2标准的功能，旨在成为新设计而非SPI的选择-2.标准。一些新特性包括:fast-80数据传输、双转换（DT）传输和并行传输上的CRC。

The SCSI protocol is designed to provide an efficient peer-to-peer I/O bus with the maximum number of hosts and peripherals determined by the bus width (8 or 16). Data may be transferred asynchronously or synchronously at rates that depend primarily on device implementation and cable length.SCSI is an I/O interface that may be operated over a wide range of media and transfer rates. The objectives of the parallel interface in SCSI are:a) To provide host computers with device independence within a class of devices. Thus, different disk drives, tape drives, printers, optical media drives and other SCSI devices may be added to the host computers without requiring modifications to generic system hardware.b) To provide compatibility such that conforming SCSI-2 and SPI-2 devices may interoperate with SPI-3 devices given that the systems engineering is correctly done. Conforming SCSI-2 and SPI-2 devices should respond in an acceptable manner to reject SPI-3 protocol extensions. SPI-3 protocol extensions are designed to be permissive of such rejections and thus allow SCSI-2 and SPI-2 devices to continue operation without requiring the use of the extensions.This international standard enhances the functionality of the SPI-2 standard, and is intended to be the choice for new designs over the SPI-2 standard. Some new features are: fast-80 data transfers, double transition (DT) transfers, and CRC on parallel transfers.

标准预览图