Add verific/sva/seq_and.sv

Signed-off-by: Clifford Wolf <clifford@clifford.at>

verific/sva/.gitignore

+/*.log
 /*.status
 /*.pass_[0-9][0-9]/
 /*.fail_[0-9][0-9]/

verific/sva/seq_and.sv

+module sequencer #(
+	//                              01234567890123456789012345678901
+	parameter [32*8-1:0] trace_a = "________________________________",
+	parameter [32*8-1:0] trace_b = "________________________________",
+	parameter [32*8-1:0] trace_c = "________________________________",
+	parameter [32*8-1:0] trace_d = "________________________________"
+
+) (
+	input clock,
+	output A, B, C, D
+);
+	integer t = 0;
+	always @(posedge clock) t <= t + (t < 31);
+
+	assign A = trace_a[8*(31-t) +: 8] == "-";
+	assign B = trace_b[8*(31-t) +: 8] == "-";
+	assign C = trace_c[8*(31-t) +: 8] == "-";
+	assign D = trace_d[8*(31-t) +: 8] == "-";
+endmodule
+
+module pass_00 (input clock);
+	wire A, B, C, D;
+
+	sequencer #(
+		//        01234567890123456789012345678901
+		.trace_a("_---____________________________"),
+		.trace_b("_----___________________________"),
+		.trace_c("_____-__________________________"),
+		.trace_d("________________________________")
+	) uut (clock, A, B, C, D);
+
+	assert property (@(posedge clock) (A [*3] and B [*4]) |=> C);
+endmodule
+
+module fail_01 (input clock);
+	wire A, B, C, D;
+
+	sequencer #(
+		//        01234567890123456789012345678901
+		.trace_a("_---____________________________"),
+		.trace_b("_----___________________________"),
+		.trace_c("____-___________________________"),
+		.trace_d("________________________________")
+	) uut (clock, A, B, C, D);
+
+	assert property (@(posedge clock) (A [*3] and B [*4]) |=> C);
+endmodule
+
+module fail_02 (input clock);
+	wire A, B, C, D;
+
+	sequencer #(
+		//        01234567890123456789012345678901
+		.trace_a("_---____________________________"),
+		.trace_b("_----___________________________"),
+		.trace_c("______-_________________________"),
+		.trace_d("________________________________")
+	) uut (clock, A, B, C, D);
+
+	assert property (@(posedge clock) (A [*3] and B [*4]) |=> C);
+endmodule