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build/gowin/common: adding Tristate support

This commit is contained in:
Gwenhael Goavec-Merou 2023-11-07 20:15:07 +01:00
parent c1e4b3a850
commit a0cb436467
1 changed files with 20 additions and 0 deletions
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20
litex/build/gowin/common.py
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@ -96,6 +96,25 @@ class GowinDifferentialOutput:
def lower(dr): def lower(dr):
return GowinDifferentialOutputImpl(dr.i, dr.o_p, dr.o_n) return GowinDifferentialOutputImpl(dr.i, dr.o_p, dr.o_n)
# Gowin Tristate -----------------------------------------------------------------------------------
class GowinTristateImpl(Module):
def __init__(self, io, o, oe, i):
nbits, _ = value_bits_sign(io)
for bit in range(nbits):
self.specials += Instance("IOBUF",
io_IO = io[bit] if nbits > 1 else io,
o_O = i[bit] if nbits > 1 else i,
i_I = o[bit] if nbits > 1 else o,
i_OEN = ~oe,
)
class GowinTristate:
@staticmethod
def lower(dr):
print(dr)
return GowinTristateImpl(dr.target, dr.o, dr.oe, dr.i)
# Gowin Special Overrides -------------------------------------------------------------------------- # Gowin Special Overrides --------------------------------------------------------------------------
gowin_special_overrides = { gowin_special_overrides = {
@ -104,4 +123,5 @@ gowin_special_overrides = {
DDROutput: GowinDDROutput, DDROutput: GowinDDROutput,
DifferentialInput: GowinDifferentialInput, DifferentialInput: GowinDifferentialInput,
DifferentialOutput: GowinDifferentialOutput, DifferentialOutput: GowinDifferentialOutput,
Tristate: GowinTristate,
} }