Answers:
所有现代以太网芯片都内置了MAC,并在GMII,RGMII或SerDes物理端口上使用MII协议与PHY设备进行通信(即使它是内置的,通常也是如此)。如果要使用双绞线接口,则信号将从PHY穿过一组变压器进入RJ-45连接。
+-------+ +-------+ +-------+ +-------+ +-------+ +-------+
| | | | | | | | | | | |
|Host |<--+ |<--+ |<------+ |<---+ |<--+ |
|Ctrl | | FIFOs | | MAC | MII | PHY | |Xformer| | RJ-45 |
|uC +-->| +-->| +------>| +--->| +-->| |
| | | | | | | | | | | |
+-------+ +-------+ +-------+ +-------+ +-------+ +-------+