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verilog: get the simulator to run the combinatorial process at the beginning

This commit is contained in:
Sebastien Bourdeauducq 2011-12-17 15:20:22 +01:00
parent ec47394012
commit 6f8a6db40a
1 changed files with 15 additions and 0 deletions
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15
migen/fhdl/verilog.py
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@ -155,8 +155,23 @@ def Convert(f, ios=set(), name="top", clk_signal=None, rst_signal=None, ns=None)
r += "\n"
if f.comb.l:
# Generate a dummy event to get the simulator
# to run the combinatorial process once at the beginning.
syn_off = "// synthesis translate off\n"
syn_on = "// synthesis translate on\n"
dummy_s = Signal(name="dummy_s")
dummy_d = Signal(name="dummy_d")
r += syn_off
r += "reg " + _printsig(ns, dummy_s) + ";\n"
r += "reg " + _printsig(ns, dummy_d) + ";\n"
r += "initial " + ns.get_name(dummy_s) + " <= 1'b0;\n"
r += syn_on + "\n"
r += "always @(*) begin\n"
r += _printnode(ns, 1, f.comb)
r += syn_off
r += "\t" + ns.get_name(dummy_d) + " <= " + ns.get_name(dummy_s) + ";\n"
r += syn_on
r += "end\n\n"
if f.sync.l:
r += "always @(posedge " + ns.get_name(clk_signal) + ") begin\n"