OpenFPGA/yosys/tests/sva/sva_throughout.sv

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module top (
input clk,
input a, b, c, d
);
default clocking @(posedge clk); endclocking
assert property (
a |=> b throughout (c ##1 d)
);
`ifndef FAIL
assume property (
a |=> b && c
);
assume property (
b && c |=> b && d
);
`endif
endmodule