DRA821U-Q1: DRA821U-Q1: Inquiry Regarding DRA821 SerDes Configuration for PCIe and Ethernet (USXGMII/RGMII)

Dongwang Kim

Prodigy 50 points

Part Number: DRA821U-Q1
Other Parts Discussed in Thread: DRA821

Tool/software:

Dear DRA821 TEAM

Hello, this is regarding the DRA821 SoC.

I am planning to configure the SerDes lanes on the DRA821 as follows:

Lane 0 and Lane 1: PCIe Gen3 (2 lanes)
Lane 2: USXGMII (10G) or HSGMII(2.5G)
Lane 3: RGMII

In this configuration, I would like to know if:

Lane 2 (USXGMII) and Lane 3 (RGMII) can both be used as native Ethernet interfaces.
It is possible to use USXGMII as ETH1 and RGMII as ETH2 independently, with both interfaces functioning simultaneously.

Could you please confirm whether this configuration is supported?

Thank you very much in advance for your support.

Best regards

6 months ago

0 Tanmay Patil 5 months ago

TI__Mastermind 40720 points

Hi,

Dongwang Kim said:
Lane 3: RGMII

RGMII doesn't require any serdes lane

Dongwang Kim said:
Lane 2 (USXGMII) and Lane 3 (RGMII) can both be used as native Ethernet interfaces.

Yes this is possible

Dongwang Kim said:
It is possible to use USXGMII as ETH1 and RGMII as ETH2 independently, with both interfaces functioning simultaneously.

Yes, this in the default MAC-only mode in the SDK.

Dongwang Kim said:
Could you please confirm whether this configuration is supported?

I am assuming that you are using linux for these interface. With that, USXGMII + PCIe combination is supported. However, we do not have the support for XAUI(2.5G SGMII) + PCIe

Regards,
Tanmay

0 Dongwang Kim 5 months ago in reply to Tanmay Patil

Prodigy 50 points

Thanks for your replying Tanmay

Lane 3: RGMII

--> this is my mistake

-->I will use RGMII in main domain

we do not have the support for XAUI(2.5G SGMII) + PCIe

--> I am planning to use HSGMII, not XAUI

--> HSGMII + PCIe conbination isn`t possible??

Best regards

0 Tanmay Patil 5 months ago in reply to Dongwang Kim

TI__Mastermind 40720 points

Hi,

Dongwang Kim said:
I am planning to use HSGMII, not XAUI

So HSGMII is similar to XAUI in both of them require a 3.125gbps serdes lane with same encoding. So the serdes configuration is same for both.

Regards,
Tanmay

0 Dongwang Kim 5 months ago in reply to Tanmay Patil

Prodigy 50 points

Isn`t it supported in SDK?? right??

0 Tanmay Patil 5 months ago in reply to Dongwang Kim

TI__Mastermind 40720 points

Hi,

It is technically feasible and possible from PDK csl driver in RTOS SDK. But the support is not present in Linux SDK. I will create a requirement for it, but it will take multiple quarters for this to be included in standard SDK.

Regards,
Tanmay

0 Dongwang Kim 5 months ago in reply to Tanmay Patil

Prodigy 50 points

Okay

I would appreciate it if you could inform me when the SDK release date is announced

Best regards

0 Tanmay Patil 5 months ago in reply to Dongwang Kim

TI__Mastermind 40720 points

Hi,

I will keep you updated on this thread here.

Regards,
Tanmay

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DRA821U-Q1: DRA821U-Q1: Inquiry Regarding DRA821 SerDes Configuration for PCIe and Ethernet (USXGMII/RGMII)