100 Mb/s Frame Transmission
The operation of the core remains unchanged. It is the responsibility of the client logic (for example, an Ethernet MAC) to enter data at the correct rate. When operating at a speed of 100 Mb/s, every byte of the MAC frame (from preamble field to the Frame Check Sequence field, inclusive) should each be repeated for 10 clock periods to achieve the desired bit rate, as illustrated in the following figure. It is also the responsibility of the client logic to ensure that the interframe gap period is legal for the current speed of operation.
Figure 1. 100 Mb/s Frame Transmission
10 Mb/s Frame Transmission
The operation of the core remains
unchanged. It is the responsibility of the client logic (for example, an Ethernet MAC),
to enter data at the correct rate. When operating at a speed of 10 Mb/s, every byte of
the MAC frame (from preamble to the frame check sequence field, inclusive) should each
be repeated for 100 clock periods to achieve the desired bit rate. It is also the
responsibility of the client logic to ensure that the interframe gap period is legal for
the current speed of operation.