Hard Processor System Technical Reference Manual: Agilex™ 5 SoCs

ID 814346
Date 7/07/2025
Public
Document Table of Contents

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 (as shown in the figure below) to support 10M/100M along with the 1G and 2.5G data rates.

Figure 311.  1G/2.5G/5G/10G Multirate Ethernet PHY IP

In all these cases, the transceivers are operating either in 1.25 Gbps or 3.125 Gbps data rates , 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.

Table 378.  Data Rates and Clock Frequency Values at GMII Interface
PHY Configuration Protocol

Transceiver Data Rate

(Gbps)

XGMAC Interface
10M/100M/1G/2.5G (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
1000BASE-X at 2.5G 3.125 8-bit GMII @ 312.5 MHz

The Enable SGMII bridge option is enabled only when you choose 1G/2.5G as the speed.