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fcao
Visitor
Visitor
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Registered: ‎05-21-2019

could 7-Series PCIe Transceivers(GTH) work on 32bit in Gen1/2?

Hi,

    I just do some research on 7-Series GTH , trying to make it work for PCIe Gen1/2 with 32bit mode instead of 16bit mode.

    I want to know whether it is a supported mode? As in ug476,  “Table 6-1: Recommended GTX/GTH Transceiver Features for PCI Express“”, I can find that it is just "Recommended" configuration, does it imply that user may get other option like Gen1/2 32bit PIPE mode? 

    I also carefully read ug476 and wondering whether below steps could work?

     1.  generate PIPE interface wrapper through AR# 62530

     2.  update lane DRP configuration, change T/RX_INT_DATAWIDTH to 32 bits, T/RX_DATA_WIDTH to 40 bits(so that pcs works on 32 bit mode while TXOUTCLKPCS is 62.5HMz)

          change TXOUTCLKSEL from 3'd3 to 3'd4. so that PCLK generated by mmcm is 62.5MHz .

      Many thanks for your help and suggestions.  :)

Felix

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deepeshm
Xilinx Employee
Xilinx Employee
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Registered: ‎08-06-2008

32-bit for Gen1/Gen2 is not supported. If you have Vivado 2014.2 or an earlier version, you could probably try by generating PCIe wrapper in the Transceiver wizard.

Thanks.

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fcao
Visitor
Visitor
241 Views
Registered: ‎05-21-2019

Get it ! Thank you for your answer.
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