T2080 Serdes lane disable

[ammasikaniv]

Hi Team,

    I am using T2080 Processor in my custom board. My serdes section hardware connections are as below:

Serdes-1 --> (x4 PCIe - A,B,C,D) & (x4 PCIe - E,F,G,H)

Serdes-2 --> (x4 PCIe - E,F,G,H) 

but i want only x2 PCIe from Serdes-2 E&F lane.

If i am using (AB-1F) protocol means, is there any possibilities to disable the serdes-2 [G,H] lane so that only x2 PCIe i can use it for my communication?  I am looking for your purport on this problem. Thanks in advance.

[r8070z]

Have a great day,

While the T2080 serdes lanes E,F,G,H are set as 4x PCIe you can connect a x2 PCIe device lanes to the E, F lanes. During PCIe training T2080 PCIe controller recognize that only E, F lanes will be used.

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[ammasikaniv]

Hi Serguei, Have a good day 

Thanks for your timely reply. Then, In this case, Is there no need of lane disabling concept?  Where we will incite to use the lane disabling concept? Thanks in advance.