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vendor.lattice_ice40: reword confusing comment. NFC.

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whitequark 2020-05-29 17:45:09 +00:00
parent 26a15b31f7
commit afa4345903
1 changed files with 2 additions and 2 deletions
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4
nmigen/vendor/lattice_ice40.py vendored
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@ -620,8 +620,8 @@ class LatticeICE40Platform(TemplatedPlatform):
self._get_io_buffer(m, pin, n_port, attrs, o_invert=not invert, invert_lut=True)
return m
# Tristate and bidirectional buffers are not supported on iCE40 because it requires external
# termination, which is incompatible for input and output differential I/Os.
# Tristate bidirectional buffers are not supported on iCE40 because it requires external
# termination, which is different for differential pins configured as inputs and outputs.
# CDC primitives are not currently specialized for iCE40. It is not known if iCECube2 supports
# the necessary attributes; nextpnr-ice40 does not.