SPRUHZ7K August 2015 – April 2024 AM5706 , AM5708 , AM5716 , AM5718 , AM5718-HIREL
On the MII transmit ports, there is a multiplexer for each MII transmit port that enables selection of either the transmit data from the PRUs or from the RX MII interface of the other MII interface. Figure 30-66 shows the symbol of transmit multiplexer of PRU.
Figure 30-66 MII Transmit MultiplexerThe transmit multiplexers enable the PRU-ICSS to either operate in a bypass mode where the PRU is not involved in processing MII traffic or use of one of the PRU cores for transmitting data into the MII interface. There are two instances of the TX MII multiplexer and the select lines for each TX multiplexer are provided by the PRU-ICSS. The select lines are common between register and FIFO interface. It is expected that the select lines will not change during the course of a frame so that can avoid data exchange error.