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Diffstat (limited to 'examples/smtbmc/demo1.v')
-rw-r--r-- | examples/smtbmc/demo1.v | 19 |
1 files changed, 19 insertions, 0 deletions
diff --git a/examples/smtbmc/demo1.v b/examples/smtbmc/demo1.v new file mode 100644 index 00000000..567dde14 --- /dev/null +++ b/examples/smtbmc/demo1.v @@ -0,0 +1,19 @@ +module demo1(input clk, input addtwo, output iseven); + reg [3:0] cnt; + wire [3:0] next_cnt; + + inc inc_inst (addtwo, iseven, cnt, next_cnt); + + always @(posedge clk) + cnt = (iseven ? cnt == 10 : cnt == 11) ? 0 : next_cnt; + +`ifdef FORMAL + assert property (cnt != 15); + initial assume (!cnt[2]); +`endif +endmodule + +module inc(input addtwo, output iseven, input [3:0] a, output [3:0] y); + assign iseven = !a[0]; + assign y = a + (addtwo ? 2 : 1); +endmodule |