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base repository: m-labs/nmigen
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  • 1 commit
  • 1 file changed
  • 1 contributor

Commits on Jun 17, 2019

  1. vendor.xilinx_7series: fix IOB packing.

    Jean-François Nguyen authored and whitequark committed Jun 17, 2019
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    b3c5ff7 View commit details
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  1. +3 −0 nmigen/vendor/xilinx_7series.py
3 changes: 3 additions & 0 deletions nmigen/vendor/xilinx_7series.py
Original file line number Diff line number Diff line change
@@ -121,6 +121,9 @@ def get_dff(clk, d, q):
for bit in range(len(q)):
_q = Signal()
_q.attrs["IOB"] = "TRUE"
# XXX: Vivado 2019.1 seems to make this flip-flop ineligible for IOB packing
# unless we prevent it from being optimized.
_q.attrs["DONT_TOUCH"] = "TRUE"
m.submodules += Instance("FDCE",
i_C=clk,
i_CE=Const(1),