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Lily1234's avatar
Lily1234
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5 years ago
Solved

Cyclone10 GX SERDES using

Hi, My project need to generate a 16 bit (@1.28Gbp/s data rate) uers data. So I use Serdes to achieve this function. Feed one pair 40M reference to IO/PLL and config SerDes in TX mode. For the ...
  • Ash_R_Altera's avatar
    Ash_R_Altera
    5 years ago

    Hi,


    Below could be the reasons for this error:

    1) When using dedicated SERDES circuitry, it does not support differential SSTL IO standard. The SERDES requires a direct connection to I/O and hence it can only interface to true LVDS I/O. So, please change IO standard of TX pins to LVDS.

    2) Check the reference clock connection. It can be either from the same bank or an adjacent bank.


    Regards.




Lily1234's avatar
Lily1234
Icon for New Contributor rankNew Contributor
5 years ago

Hi，

Thanks for your kindly reply. I change the TX I/O standard to LVDS, the compilation passes. And I connect the reference clock to 3B bank (LVDS standard).

But I am still confused. The handbook shows SERDES supports differential SSTL-1.2V. Which kind of occasions can SSTL be used and which occasions can we use LVDS?

Below is the table I copy from SERDES handbook (https://www.intel.com/content/www/us/en/programmable/documentation/vua1487061384661.html#prw1491785518129 ).

Thanks,

Lily