GMII Reception - 2.7 English

1G/10G/25G Switching Ethernet Subsystem Product Guide (PG292)

Document ID
PG292
Release Date
2023-10-18
Version
2.7 English

1/2.5 Gbps Frame Reception

The timing of a normal inbound frame transfer is shown in the following figure.

Figure 1. GMII Frame Reception at 1 Gbps

100 Mbps Frame Reception

At 100 Mbps the operation of the core is unchanged. When operating at a speed of 100 Mbps, every byte of the MAC frame (from the preamble to the frame check sequence field, inclusive) is repeated for 10 clock periods to achieve the desired bit rate. See the following figure.

Figure 2. GMII Data Reception at 100 Mb/s

10 Mbps Frame Reception

The operation of the core remains unchanged. When operating at a speed of 10 Mbps, every byte of the MAC frame (from the preamble to the frame check sequence field, inclusive) is repeated for 100 clock periods to achieve the desired bit rate.