Is it possible to feed the MAC with 125MHz clock internally when using RGMII?

cancel
Showing results for 
Search instead for 
Did you mean: 

Is it possible to feed the MAC with 125MHz clock internally when using RGMII?

84 Views
Contributor III

Hello,

I use the RGMII interface of my i.MX6Q to connect a 100Mbps PHY. Currently I generate a 125MHz clock by the ANATOP (Analog Ethernet PLL) put it out on GPIO16 (GPIO7_IO11 -> Ball R2) do a wire connection between GPIO16 and ENET_REF_CLK (GPIO1_IO23 -> Ball V22) and feed the MAC.

Is it possible to route the 125MHz interally to the ENET_REF_CLK?

In RMII mode this is possible. Hardware Development Guide 12.4.1:

imx6_enet_clk.png

I my opinion the block labeled "ENET" is different from the ENET_REF_CLK which is used in RGMII mode. I don't need the 125MHz outside the i.MX6.

Labels (5)
Tags (2)
2 Replies

6 Views
NXP TechSupport
NXP TechSupport

Hi Michael

>Is it possible to route the 125MHz interally to the ENET_REF_CLK?

not, sorry.

So one can follow below answers:

using GPIO_16 pin as reference clock in RGMII 

https://community.nxp.com/message/425444#425444 

Best regards
igor
-----------------------------------------------------------------------------------------------------------------------
Note: If this post answers your question, please click the Correct Answer button. Thank you!
-----------------------------------------------------------------------------------------------------------------------

6 Views
Contributor III

Thanks Igor for the fast reply

0 Kudos