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RMII Ethernet interface, driver software

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  • SimoniusSimonius Posts: 65
    edited 2023-01-21 22:09

    The driver can sustain the full 100 mbits.
    To calculate the theoretical maximum
    Start with the 1500 packet size, add the 12 inter-frame-gap + the frame overhead ( 8 for preamble + 14 for header + 4 for the CRC )
    then calculate the theoretical max speed:
    100 Mbit/s / 8 bits in a byte * (1500/1538)
    = 12.19 MB/sec
    The throughput will decrease when packets get smaller (the minimal ethernet packet would have 46 bytes payload @ 6,85 MBps).

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