1 files changed, 36 insertions, 0 deletions
diff --git a/tests/simple/usb_phy_tests.v b/tests/simple/usb_phy_tests.v
new file mode 100644
index 00000000..bc45e71a
--- /dev/null
+++ b/tests/simple/usb_phy_tests.v
@@ -0,0 +1,36 @@
+
+// from usb_rx_phy
+module usb_phy_test01(clk, rst, rx_en, fs_ce);
+
+input		clk, rst;
+input		rx_en;
+output reg	fs_ce;
+reg	[1:0]	dpll_next_state;
+reg	[1:0]	dpll_state;
+
+always @(posedge clk)
+	dpll_state <= rst ? 0 : dpll_next_state;
+
+always @*
+   begin
+	fs_ce = 1'b0;
+	case(dpll_state)
+	   2'h0:
+		if(rx_en)	dpll_next_state = 2'h0;
+		else		dpll_next_state = 2'h1;
+	   2'h1:begin
+		fs_ce = 1'b1;
+		if(rx_en)	dpll_next_state = 2'h3;
+		else		dpll_next_state = 2'h2;
+		end
+	   2'h2:
+		if(rx_en)	dpll_next_state = 2'h0;
+		else		dpll_next_state = 2'h3;
+	   2'h3:
+		if(rx_en)	dpll_next_state = 2'h0;
+		else		dpll_next_state = 2'h0;
+	endcase
+   end
+
+endmodule
+