topic Re: iMX7 RGMII voltage rating in i.MX Processors

iMX7 RGMII voltage rating

justin_hsieh — Thu, 10 Sep 2020 11:02:31 GMT

Dear Team,

Our product is iMX7 plateform with giga ethernet PHY applicatin, and RGMII operation voltage is 3.3V.

We find Ethernet PHY 125MHz clock Max/Min voltage are 3.80835V/-1.02387V,but we can't find the RGMII voltage rating in product spec.

please help check does RGMII clock meet iMX7 RGMII RX Spec.?

RGMII_RX_CLK

Thks,

Justin

Re: iMX7 RGMII voltage rating

igorpadykov — Thu, 10 Sep 2020 23:27:08 GMT

Hi justin_hsieh

enet voltages can be found in Table 9. Operating ranges

i.MX 7Dual Family of Applications Processors Datasheet

also one can use rgmii example in

Design files, including hardware schematics, Gerbers, and OrCAD files for i.MX 7Dual

Best regards
igor

Re: iMX7 RGMII voltage rating

justin_hsieh — Fri, 11 Sep 2020 01:58:28 GMT

Hi igor,

According to RGMII Spec., Tr/Tf must smaller than 0.75ns, we have to increase RX_CLK drive capacity and cause the Max/Min voltage be 3.80835V/-1.02387V.

Can you kindly help to check iMX7 can stand the Max/Min voltage are 3.80835V/-1.02387V or not?

Tks,

Justin

Re: iMX7 RGMII voltage rating

igorpadykov — Fri, 11 Sep 2020 05:24:06 GMT

please refer to datasheet

Best regards
igor