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Ixiasoft
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Ixiasoft
5.1.9.3.2. Use Case 2 – Configure External PHY RGMII-Internal Delay (RGMII-ID)
The RGMII 2.0 specification introduced the delay on-chip at the source. Devices which support the internal delay features are commonly referred as RGMII-ID. The Agilex™ 5 EMAC does not support RGMII-ID, but today most of the PHY do support RGMII 2.0.
The RGMII-ID provides you with a convenient way to configure PHY specific RX/TX clock delay register which can be used to adjust the timing of the clock signals to account for signal skew.
When selecting a PHY device, consider the desired Ethernet rate, available I/O and transceivers, PHY devices that offer the RGMII-ID skew control feature, and device driver availability.