ISO/IEC 14776-115:2004 信息技术.小型计算机系统接口（SCSI）.第115部分：平行接口-5（SPI-5）

标准编号：ISO/IEC 14776-115:2004

中文名称：信息技术.小型计算机系统接口（SCSI）.第115部分：平行接口-5（SPI-5）

英文名称：Information technology — Small Computer System Interface (SCSI) — Part 115: Parallel Interface-5 (SPI-5)

发布日期：2004-11

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。ISO/IEC 14776的这一部分定义了机械、电气、定时要求、命令集和任务管理交付协议要求，以在连接到SCSI并行接口的SCSI设备之间传输命令和数据。生成的接口促进计算机和智能外围设备的互连，从而提供系统集成商和智能设备供应商的通用接口标准外围设备。本标准定义了用于互连的输入/输出总线的物理属性计算机和外围设备。SCSI并行接口是一种本地I/O总线，可在各种不同的设备上运行转移率。SCSI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可以将设备添加到主机，而无需修改通用配置系统硬件。所列经费用于增加特殊特征和功能通过使用特定于供应商的选项。预留区域供将来使用标准化。b） 提供兼容性，使符合标准的SPI-2、SPI-3设备可以互操作如果正确完成了系统工程，则使用SPI-5设备。一致的SPI-2、SPI-3和SPI-5.设备应以可接受的方式响应拒绝SPI-5协议扩展。SPI-5协议扩展旨在允许这种拒绝，因此允许SPI-2和SPI-3设备继续运行，而无需需要使用扩展。

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.This part of ISO/IEC 14776 defines mechanical, electrical, timing requirements, command sets, and the task management delivery protocol requirements to transfer commands and data between SCSI devices attached to an SCSI parallel interface. The resulting interfacefacilitates the interconnection of computers and intelligent peripherals and thus provides acommon interface standard for both system integrators and suppliers of intelligentperipherals. This standard defines the physical attributes of an input/output bus for interconnectingcomputers and peripheral devices.The SCSI parallel interface is a local I/O bus that may be operated over a wide range oftransfer rates. The objectives of the SCSI parallel interface 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 SCSIdevices may be added to the host computers without requiring modifications to genericsystem hardware. Provision is made for the addition of special features and functionsthrough the use of vendor-specific options. Reserved areas are provided for futurestandardization.b) To provide compatibility such that conforming SPI-2, SPI-3 devices may interoperatewith SPI-5 devices given that the systems engineering is correctly done. ConformingSPI-2, SPI-3, and SPI-5 devices should respond in an acceptable manner to rejectSPI-5 protocol extensions. SPI-5 protocol extensions are designed to be permissive ofsuch rejections and thus allow SPI-2 and SPI-3 devices to continue operation withoutrequiring the use of the extensions.

标准预览图