PCIe基础概念

《PCI_Exepress体系结构导读》《WDC databook》读书笔记

RCB  read completion boundary

MPS max payload size

MRRS max read request size

4K对齐 

Specifies the address page boundary size supported by the AXI bridge. No packet can

have an address that crosses the specified address boundary.

DW对齐 double word对齐，4字节对齐

配置空间 

tag 读请求与读完成报文中，多个报文并行发出

capacity 配置空间读写header中包含capacity链表指针，msi就是其中一个capacity，还有常见的电源管理。

在 PCIe 设备中 ， 每

一个 Capability 结构都有唯一的 ID 号

bar 

credit机制

msi intx是电平触发，msi是边缘触发，msi的实质是mem write报文，MSI 中断机制使用存储器写 TLP 实现， 这个存储器写 TLP 的目的地址为 MSI Capability 结构中的 Message Address 字段， 而数据为 Message Data 寄存器中的值。

inbound/outbound pcie 总线地址与ddr地址之间转换

outbound Transactions that enter the controller from your application side of the controller. These

transactions are passed to the native controller, where they are sent out onto the PCIe wire.

inbound PCIe transactions that enter the controller from the wire side of the controller (PCIe wire). These transactions are delivered to your application side.