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User1580871742356367's avatar
User1580871742356367
Icon for Occasional Contributor rankOccasional Contributor
4 years ago

DDR4 controller DQS pins

I wonder if the polarity of DQS signal can be inverted inside FPGA (not HPS), for example, bank 3F or 3H. The DQS_P and DQS_N connection are reversed at one DDR4 device side and there 4 DDR4 devic...
User1580871742356367's avatar
User1580871742356367
Icon for Occasional Contributor rankOccasional Contributor
4 years ago

Hi Adzim,

Appreciate quick response.

I know the DQS P/N pins can not be changed or swapped.

I meant inverting DQS in the VHDL or Verilog code, for example, somewhere in the MIG, like put a NOT gate.

ASAP, thank you.

AdzimZM_Altera's avatar
AdzimZM_Altera
Icon for Regular Contributor rankRegular Contributor
4 years ago

Hi Sir,

I don't think you can do that due to timing related issue.

Besides, the signals are harden circuitry that you not able to change it.

Regards,

Adzim