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compat.fhdl.specials: fix platform lowering for TSTriple again.

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This commit is contained in:
whitequark 2019-06-04 13:03:56 +00:00
parent 79a3710255
commit 38917e4523
1 changed files with 13 additions and 9 deletions
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22
nmigen/compat/fhdl/specials.py
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@ -7,6 +7,7 @@ from ...hdl.mem import Memory as NativeMemory
from ...hdl.ir import Fragment, Instance
from ...hdl.dsl import Module
from .module import Module as CompatModule
from ...lib.io import Pin
__all__ = ["TSTriple", "Instance", "Memory", "READ_FIRST", "WRITE_FIRST", "NO_CHANGE"]
@ -32,22 +33,25 @@ class TSTriple:
class Tristate(Elaboratable):
def __init__(self, target, o, oe, i=None):
self.target = target
self.triple = TSTriple()
self.triple.o = o
self.triple.oe = oe
if i is not None:
self.triple.i = i
self.o = o
self.oe = oe
self.i = i if i is not None else None
def elaborate(self, platform):
if hasattr(platform, "get_input_output"):
return platform.get_input_output(self.triple, self.target, extras={})
pin = Pin(len(self.target), dir="oe" if self.i is None else "io")
pin.o = self.o
pin.oe = self.oe
if self.i is not None:
pin.i = self.i
return platform.get_input_output(pin, self.target, extras={})
m = Module()
m.d.comb += self.triple.i.eq(self.target)
m.d.comb += self.i.eq(self.target)
m.submodules += Instance("$tribuf",
p_WIDTH=len(self.target),
i_EN=self.triple.oe,
i_A=self.triple.o,
i_EN=self.oe,
i_A=self.o,
o_Y=self.target,
)