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zybo: fix PCW_UIPARAM_DDR_DQS_TO_CLK_DELAY error in Vivado. #25

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zybo: fix PCW_UIPARAM_DDR_DQS_TO_CLK_DELAY error in Vivado. #25

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@svet-am svet-am commented Apr 22, 2020

The original ZYBO files had negative DQS values and this caused errors in Vivado. This is hardware errata as noted on Digilent site https://reference.digilentinc.com/reference/programmable-logic/zybo-z7/reference-manual and Xilinx Answer Record 53039

The original ZYBO files had negative DQS values and this caused errors in Vivado.  This is hardware errata as noted on Digilent site https://reference.digilentinc.com/reference/programmable-logic/zybo-z7/reference-manual and Xilinx Answer Record 53039
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svet-am commented Apr 22, 2020

this is to fix the Vivado errors about PCW_UIPARAM_DDR_DQS_TO_CLK_DELAY. By setting the values to 0.0, the designs passes Vivado with no errors and still works on the board.

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