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build/lattice/common.py: added Tristate support for ECP5 when build with diamond #2125

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Nov 18, 2024
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build/lattice/common.py: added Tristate support for ECP5 when build with diamond #2125

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19 changes: 19 additions & 0 deletions litex/build/lattice/common.py
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Original file line number Diff line number Diff line change
Expand Up @@ -137,10 +137,29 @@ class LatticeECP5DifferentialOutput:
def lower(dr):
return LatticeECP5DifferentialOutputImpl(dr.i, dr.o_p, dr.o_n)

# ECP5 Special Tristate ----------------------------------------------------------------------------

class LatticeECP5TristateImpl(Module):
def __init__(self, io, o, oe, i):
nbits, sign = value_bits_sign(io)
for bit in range(nbits):
self.specials += Instance("BB",
io_B = io[bit] if nbits > 1 else io,
i_I = o[bit] if nbits > 1 else o,
o_O = i[bit] if nbits > 1 else i,
i_T = ~oe
)

class LatticeECP5Tristate(Module):
@staticmethod
def lower(dr):
return LatticeECP5TristateImpl(dr.target, dr.o, dr.oe, dr.i)

# ECP5 Special Overrides ---------------------------------------------------------------------------

lattice_ecp5_special_overrides = {
AsyncResetSynchronizer: LatticeECP5AsyncResetSynchronizer,
Tristate: LatticeECP5Tristate,
SDRInput: LatticeECP5SDRInput,
SDROutput: LatticeECP5SDROutput,
DDRInput: LatticeECP5DDRInput,
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