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pytholite/io: fix Wishbone writes + support sel attribute

This commit is contained in:
Sebastien Bourdeauducq 2012-11-23 13:40:46 +01:00
parent 20d87682ad
commit 0b7dd7bdce
1 changed files with 10 additions and 1 deletions
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11
migen/pytholite/io.py
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@ -94,9 +94,18 @@ def _gen_wishbone_io(compiler, modelname, model, to_model, from_model, bus):
]
if model == TWrite:
state.append(bus.we.eq(1))
if from_model:
raise TypeError("Attempted to read from write transaction")
state += [
bus.we.eq(1),
bus.dat_w.eq(compiler.ec.visit_expr(to_model["data"]))
]
sel = to_model["sel"]
if isinstance(sel, ast.Name) and sel.id == "None":
nbytes = (len(bus.dat_w) + 7)//8
state.append(bus.sel.eq(2**nbytes-1))
else:
state.append(bus.sel.eq(compiler.ec.visit_expr(sel)))
else:
state.append(bus.we.eq(0))
ec = _BusReadExprCompiler(compiler.symdict, modelname, bus.dat_r)