请问TMS320F28388D EtherCAT部分ESC连接的PHY芯片的外部时钟源必须和MCU28388的外部时钟源是同一个吗？
请看该帖子的回复
https://e2e.ti.com/support/microcontrollers/c2000-microcontrollers-group/c2000/f/c2000-microcontrollers-forum/949551/tmdscncd28388d-ethercat-phy-clock-source
The key item to remember is that the device/ECAT IP and the PHYs need to both be clocked from the same clock source.
您可以看一下数据手册的
https://www.ti.com.cn/cn/lit/ds/symlink/tms320f28388d.pdf
图 7-7. Clocking System
