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TM4C129如何实现100M以太网通讯速率的?

TM4C129的EN0TXOP/EN0TXON/EN0RXIP/EN0RXIN的BUFFER类型都是TTL的,TTL类型的信号的传输速率最大是20~30Mhz,那么TI的TM4C129是怎么实现100M的通信速率的呢?