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Generate FSM-style testbenches in smtbmc

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This commit is contained in:
Clifford Wolf 2017-07-12 15:57:04 +02:00
parent 4a8c131fa7
commit 10c7709e68
1 changed files with 23 additions and 5 deletions
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24
backends/smt2/smtbmc.py
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@ -692,6 +692,7 @@ def write_vlogtb_trace(steps_start, steps_stop, index):
print("module testbench;", file=f)
print(" reg [4095:0] vcdfile;", file=f)
print(" reg clock = 0, genclock = 1;", file=f)
print(" reg [31:0] cycle = 0;", file=f)
primary_inputs = list()
clock_inputs = set()
@ -767,26 +768,43 @@ def write_vlogtb_trace(steps_start, steps_stop, index):
for addr, data in addr_data.items():
print(" UUT.%s[%d'b%s] = %d'b%s;" % (".".join(mempath), len(addr), addr, len(data), data), file=f)
print("", file=f)
anyseqs = sorted(smt.hieranyseqs(vlogtb_topmod))
for i in range(steps_start, steps_stop):
pi_names = [[name] for name, _ in primary_inputs if name not in clock_inputs]
pi_values = smt.get_net_bin_list(vlogtb_topmod, pi_names, vlogtb_state.replace("@@step_idx@@", str(i)))
print("", file=f)
print(" // state %d" % i, file=f)
if i > 0:
print(" @(posedge clock);", file=f)
print(" if (cycle == %d) begin" % (i-1), file=f)
for name, val in zip(pi_names, pi_values):
if i > 0:
print(" PI_%s <= %d'b%s;" % (".".join(name), len(val), val), file=f)
else:
print(" PI_%s = %d'b%s;" % (".".join(name), len(val), val), file=f)
for info in anyseqs:
if info[3] is not None:
modstate = smt.net_expr(vlogtb_topmod, vlogtb_state.replace("@@step_idx@@", str(i)), info[0])
value = smt.bv2bin(smt.get("(|%s| %s)" % (info[1], modstate)))
if i > 0:
print(" UUT.%s <= %d'b%s;" % (".".join(info[0] + [info[3]]), len(value), value), file=f);
else:
print(" UUT.%s = %d'b%s;" % (".".join(info[0] + [info[3]]), len(value), value), file=f);
print(" genclock <= 0;", file=f)
if i > 0:
print(" end", file=f)
print("", file=f)
if i == 0:
print(" end", file=f)
print(" always @(posedge clock) begin", file=f)
print(" genclock <= cycle < %d;" % (steps_stop-1), file=f)
print(" cycle <= cycle + 1;", file=f)
print(" end", file=f)
print("endmodule", file=f)