OpenFPGA/yosys/tests/sva/basic03.sv

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module top (input logic clk, input logic selA, selB, QA, QB, output logic Q);
always @(posedge clk) begin
if (selA) Q <= QA;
if (selB) Q <= QB;
end
check_selA: assert property ( @(posedge clk) selA |=> Q == $past(QA) );
check_selB: assert property ( @(posedge clk) selB |=> Q == $past(QB) );
`ifndef FAIL
assume_not_11: assume property ( @(posedge clk) !(selA & selB) );
`endif
endmodule