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vendor.lattice_ice40: avoid routing conflicts with SDR/DDR input pins.

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This commit is contained in:
whitequark 2019-08-04 00:30:50 +00:00
parent 2e6627c4af
commit 34a97b2751
1 changed files with 6 additions and 2 deletions
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8
nmigen/vendor/lattice_ice40.py vendored
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@ -244,11 +244,15 @@ class LatticeICE40Platform(TemplatedPlatform):
] ]
if "i" not in pin.dir: if "i" not in pin.dir:
i_type = 0b00 # PIN_NO_INPUT aka PIN_INPUT_REGISTERED # If no input pin is requested, it is important to use a non-registered input pin
# type, because an output-only pin would not have an input clock, and if its input
# is configured as registered, this would prevent a co-located input-capable pin
# from using an input clock.
i_type = 0b01 # PIN_INPUT
elif pin.xdr == 0: elif pin.xdr == 0:
i_type = 0b01 # PIN_INPUT i_type = 0b01 # PIN_INPUT
elif pin.xdr > 0: elif pin.xdr > 0:
i_type = 0b00 # PIN_INPUT_REGISTERED i_type = 0b00 # PIN_INPUT_REGISTERED aka PIN_INPUT_DDR
if "o" not in pin.dir: if "o" not in pin.dir:
o_type = 0b0000 # PIN_NO_OUTPUT o_type = 0b0000 # PIN_NO_OUTPUT
elif pin.xdr == 0 and pin.dir == "o": elif pin.xdr == 0 and pin.dir == "o":