ice40: Add examples folder including floorplan example

Signed-off-by: David Shah <dave@ds0.me>

1 files changed, 22 insertions, 0 deletions

diff --git a/ice40/examples/floorplan/floorplan.v b/ice40/examples/floorplan/floorplan.v
new file mode 100644
index 00000000..8f99ed4e
--- /dev/null
+++ b/ice40/examples/floorplan/floorplan.v
@@ -0,0 +1,22 @@
+module top(output LED1, LED2, LED3, LED4, LED5);
+    localparam N = 31;
+    wire [N:0] x;
+    assign x[0] = x[N];
+
+    genvar ii;
+    generate
+
+    for (ii = 0; ii < N; ii = ii + 1) begin
+        (* ringosc *)
+        SB_LUT4 #(.LUT_INIT(1)) lut_i(.I0(x[ii]), .I1(), .I2(), .I3(), .O(x[ii+1]));
+    end
+    endgenerate
+
+    assign clk = x[N];
+
+
+    reg [19:0] ctr;
+    always @(posedge clk)
+        ctr <= ctr + 1'b1;
+    assign {LED5, LED4, LED3, LED2, LED1} = ctr[19:15];
+endmodule