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Pin direction and XDR can be set even if there is not matching subsignal #462

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jeanthom opened this issue Aug 3, 2020 · 1 comment
Open

Pin direction and XDR can be set even if there is not matching subsignal #462

jeanthom opened this issue Aug 3, 2020 · 1 comment
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@jeanthom
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jeanthom commented Aug 3, 2020 

from nmigen import *
from nmigen_boards.ecpix5 import *

class Top(Elaboratable):
	def elaborate(self, platform):
		m = Module()

		ddr3 = platform.request("ddr3", 0, dir={"arrosoir":"-"},
			xdr={"chaise":4})

		return m

if __name__ == "__main__":
	top = Top()
	ECPIX585Platform().build(top)

The above code should at least trigger a warning.
@whitequark
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IIRC it is done this way because some resources have optional pins, and otherwise you wouldn't have any way to request XDR on a pin if it exists, skipping it otherwise. I agree that this is not ideal.

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@whitequark @jeanthom