本标准定义了一个循环队列接口，用于通过PCI Express体系结构在PQI主机和PQI设备之间传输信息，并定义了用于描述数据缓冲区的分散-聚集列表（SGL）格式。SCSI系列标准提供了许多不同的传输协议，这些协议定义了不同SCSI设备之间交换信息的规则。本标准定义了使用PCI Express队列层在SCSI设备之间交换信息的规则。其他SCSI传输协议标准定义了使用其他互连在SCSI设备之间交换信息的规则。 PCI Express用作本标准的互连。本标准定义了一个通用排队模型，以允许传输IUs。

This standard defines a circular queue interface for transferring information between a PQI host and a PQI device over the PCI Express architecture, and defines a scatter gather list (SGL) format that is used to describe data buffers.The SCSI family of standards provides for many different transport protocols that define the rules for exchanging information between different SCSI devices. This standard defines the rules for exchanging information between SCSI devices using a PCI Express queuing layer. Other SCSI transport protocol standards define the rules for exchanging information between SCSI devices using other interconnects.PCI Express is used as the interconnect for this standard. This standard defines a generic queuing model to allow transporting IUs.