initial import

1 files changed, 69 insertions, 0 deletions

diff --git a/tests/simple/fsm.v b/tests/simple/fsm.v
new file mode 100644
index 000000000..79ca041dd
--- /dev/null
+++ b/tests/simple/fsm.v
@@ -0,0 +1,69 @@
+
+// `define ASYNC_RESET
+
+module test(clk, reset, button_a, button_b, red_a, green_a, red_b, green_b);
+
+input clk, reset, button_a, button_b;
+output reg red_a, green_a, red_b, green_b;
+
+(* gentb_constant = 0 *)
+wire reset;
+
+integer state;
+reg [3:0] cnt;
+
+`ifdef ASYNC_RESET
+always @(posedge clk, posedge reset)
+`else
+always @(posedge clk)
+`endif
+begin
+	cnt <= 0;
+	red_a <= 1;
+	red_b <= 1;
+	green_a <= 0;
+	green_b <= 0;
+
+	if (reset)
+		state <= 100;
+	else
+		case (state)
+			100: begin
+				if (button_a && !button_b)
+					state <= 200;
+				if (!button_a && button_b)
+					state <= 300;
+			end
+			200: begin
+				red_a <= 0;
+				green_a <= 1;
+				cnt <= cnt + 1;
+				if (cnt == 5)
+					state <= 210;
+			end
+			210: begin
+				red_a <= 0;
+				green_a <= cnt[0];
+				cnt <= cnt + 1;
+				if (cnt == 10)
+					state <= 100;
+			end
+			300: begin
+				red_b <= 0;
+				green_b <= 1;
+				cnt <= cnt + 1;
+				if (cnt == 5)
+					state <= 310;
+			end
+			310: begin
+				red_b <= 0;
+				green_b <= cnt[0];
+				cnt <= cnt + 1;
+				if (cnt == 10)
+					state <= 100;
+			end
+		endcase
+end
+
+endmodule
+