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RGMII : ENET_REF_CLK

Question asked by Eishi Shibusawa on Sep 28, 2018
Latest reply on Sep 28, 2018 by gusarambula

Dear Sir

 

Customers use the i.MX6DL ENET with RGMII.

Please tell me about RGMII I/F.

 

The following explanation is on P146 of IMX6SDLIEC Rev.8.

ENET_REF_CLK is used as a clock source for MII and RGMII modes only.

RGMII mode uses either GPIO_16 or RGMII_TX_CTL as a clock source.

For more information on these clocks, see the device Reference Manual and the Hardware Development Guide for i.MX 6Quad, 6Dual, 6DualLite, 6Solo Families of Applications Processors (IMX6DQ6SDLHDG).

 

I confirmed the Table 23-1. ENET External Signals (P1062) of IMX6SDLRM Rev.4.

ENET_REF_CLK : In RMII mode, this signal is the reference clock for receive, transmit, and the control interface.

(It seems that the ENET_REF_CLK is used only when the MII setting.)

 

Q1.

Does it need the 125MHz clock to ENET_REF_CLK when it is configured the ENET as RGMII?

 

Q2.

How is the AC spec (Duty) if it needs the 125MHz clock to the ENET_REF_CLK?

 

Best Regards,

Eishi SHIBUSAWA

 

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