Hard Processor System Technical Reference Manual: Agilex™ 5 SoCs
12.3.2. GMII to SGMII+ through Multirate Ethernet PHY Adapter via FPGA Transceiver
To support the 2.5G rate, you must enable the 8-bit GMII interface to FPGA fabric. From there, it connects to a different PHY device via the FPGA transceivers, which then drives the copper media.
This configuration enables the data path between HPS, XGMAC, multirate PHY (Direct mode), and the PHY operating at 2.5G rate. The multirate PHY IP supports SGMII+ interface, which can work on the 10M/100M/1G/2.5G data rates. The SGMII interface supports only 10M/100M/1G data rates.
Multirate Ethernet PHY Use Case | 1G Support | 2.5G Support |
---|---|---|
10M/100M/1G bps | Yes 1G 41, non-PTP |
No |
1G static | Yes 1G41 |
No |
2.5G static | No | Yes |
1G/2.5G dynamic reconfiguration | Yes 1G41 |
Yes |
Dynamic Reconfiguration
You can change the PHY speed using the dynamic reconfiguration (DR) controller block in the Multirate Ethernet PHY system example design. To enable DR for multiple transceiver channels (one Multirate Ethernet PHY IP for each channel), you must generate the Multirate Ethernet PHY IP with the required settings and supported number of profiles.