pcie处理层协议中文详解(13)

r[2:0]是010时，寻址方式就是ID寻址。

completion rules（应答机制）：completion包用ID

寻址方式，寻址使用的ID就是request提供的requester ID。除了那些正常的域以外，还包括：

◆ Completer ID[15:0] – Identifies the

Completer – described in detail below

◆ Completion Status[2:0] – Indicates the status

for a Completion

◆ BCM – Byte Count Modified

◆ Byte Count[11:0] – The remaining byte count

for Request

◆ Tag[7:0] – in combination with the Requester

ID field, corresponds to the Transaction ID

◆ Lower Address[6:0] – lower byte address for

starting byte of Completion

compl.Status位有如下含义：