Hard Processor System Technical Reference Manual: Agilex™ 3 SoCs
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12.3.2.2.2. SGMII Bridge
You must turn on Enable SGMII bridge in the 1G/2.5G/5G/10G Multirate Ethernet PHY IP parameter editor to support 10M/100M along with the 1G data rates.
In all these cases, the transceivers are operating in 1.25 Gbps data rate, as shown in the following table. The SGMII bridge takes care of data replication for the MII data rates and controls the date enable signals.
| PHY Configuration | Protocol | Transceiver Data Rate (Gbps) |
XGMAC Interface |
|---|---|---|---|
| 10M/100M/1G (SGMII) | SGMII | 1.25 | 4-bit MII @ 2.5 MHz |
| SGMII | 1.25 | 4-bit MII @ 25 MHz | |
| 1000BASE-X/SGMII | 1.25 | 8-bit GMII @ 125 MHz |
The GMII interfaces support the clock enable signals in both directions. These signals go high for 1/100 cycles and 1/10 cycles for 10M and 100M respectively. For other rates, they always stay high.
The Enable SGMII bridge option is enabled only when you choose 1G/2.5G as the speed.