45.3. tsn_frame_preemption_egress

45.3.1. 概述

本示例展示了TSN可抢占帧(IEEE802.1 Qbu)输入

观察接收端数据帧的接收顺序
- 发送端先发送可抢占流，再发送快速流，接收端先接收快速流，后接收可抢占流
  
  注：接收顺序是从CPU角度出发而言
观察接收端FPE及RX-Time的值
- 可抢占流FPE为1且RX-Time为0，而快速流PFE为0且RX-Time为非0
观察FPE Assembly Ok Counter的值是否与发送端同步递增
- 同步递增表示成功接收可抢占流

45.3.2. 硬件设置

使用USB Type-C线缆连接PC USB端口和PWR DEBUG端口
使用以太网线缆连接两块开发板的RGMIII端口

45.3.3. 工程配置

无

45.3.4. 运行示例

编译下载程序
串口终端显示如下信息：

This is a TSW demo: Frame Preemption Egress
TSW phy init passed !
Link Status: Down
Link Status: Up
Link Speed:  1000Mbps
Link Duplex: Full duplex
FPE: 0, RX-Time: 3.399945890
Rx Frame Length: 60
ff ff ff ff ff ff 98 2c bc b1 9f 17 08 06 00 01 08 00 06 04 00 01 98 2c bc b1 9f 17 c0 a8 64 0a 00 00 00 00 00 00 c0 a8 64 05 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
FPE Assembly Ok Counter: 2
==============================================================================================================================================================================================================
FPE: 1, RX-Time: 0.000000000
Rx Frame Length: 512
ff ff ff ff ff ff 98 2c bc b1 9f 17 08 06 00 01 08 00 06 04 00 01 98 2c bc b1 9f 17 c0 a8 64 0a 00 00 00 00 00 00 c0 a8 64 05 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
FPE Assembly Ok Counter: 2
==============================================================================================================================================================================================================