HD3SS3212-Q1: RGMII support

Haury Zhou

Expert 3356 points

Part Number: HD3SS3212-Q1
Other Parts Discussed in Thread: DP83TC812R-Q1

Hi team,

Can HD3SS3212-Q1 support RGMII signal? If so, is it necessary to add AC couple capacitors?

BRs,

Haury

7 months ago

0 Shane Hauser 7 months ago

TI__Genius 9885 points

Hi Haury,

Can you give more specifics on the signal such as frequency and common mode voltage?

Best,

Shane

0 Haury Zhou 7 months ago in reply to Shane Hauser

TI__Expert 3356 points

Hi Shane,

RGMII is a standard interface protocol of ethernet. You can google many introduction in the web. As an example,

https://www.intel.com/content/www/us/en/docs/programmable/683360/18-0/rgmii.html

I also see that 3212 can support ethernet in our roadmap.

So could you tell me which ethernet PHY interface can it support? Can HD3SS3212-Q1 support RGMII signal?

Can it support TI 100M PHY DP83TC812R-Q1 and 1000M PHY DP83TG720R-Q1?

https://www.ti.com/product/DP83TG720R-Q1?keyMatch=720

https://www.ti.com/product/DP83TC812R-Q1

BRs,
Haury

0 Shane Hauser 7 months ago in reply to Haury Zhou

TI__Genius 9885 points

Hi Haury,

The 3212 should work for this use case. Your signal is well within the 10Gbps frequency limit so you would just want to make sure the common mode voltage is within 0 - 2V. If it is outside of this range, you would need to AC couple the signal to the MUX.

Best,

Shane

+1 Shane Hauser 7 months ago in reply to Shane Hauser

TI__Genius 9885 points

While looking I did see that there are two versions for RGMII with different interface voltages. If you know which version you are using that should help determine whether AC coupling is necessary or not. With version 2.0 having 1.5V interface voltages, you wouldn't need AC coupling.

Best,

Shane

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HD3SS3212-Q1: RGMII support