Hello Experts,
My customer is building their own board. They have two questions about RGMII.
(1) Is it necessary to control impedance at a single 50 ohm for each RGMII line?
(there is no description of RGMII in High-Speed Interface Layout Guidelines.)
(2) Could you please tell us what the RGMII mode (TXC, RXC Delay setting) and Delay values are by SDK default for SK-AM62A-LP?
Best regards,
Ken
Hello Ken,
Thank you.
(2) Could you please tell us what the RGMII mode (TXC, RXC Delay setting) and Delay values are by SDK default for SK-AM62A-LP?
As far as i understand, there SoC supports only TX delay.
The delay is always enabled and the bit (bit-3) is reserved.
Let me request the device expert to provide his thoughts.
Regards,
Sreenivasa
Hello Ken,
Thank you.
Based on the inputs i received, the internal delay is enabled by default.
Refer AM64x datasheet for the timing as below.
Table 7-30. RGMII[x]_TD[3:0] and RGMII[x]_TX_CTL Switching Characteristics – RGMII Mode
Table 7-139. PRU_ICSSG RGMII Switching Characteristics – RGMII[x]_TD[3:0] and RGMII[x]_TX_CTL
Regards,
Sreenivasa
