ice40: Testing the placement validity check

Signed-off-by: David Shah <davey1576@gmail.com>

1 files changed, 27 insertions, 0 deletions

diff --git a/ice40/pack_tests/locals.v b/ice40/pack_tests/locals.v
new file mode 100644
index 00000000..a1c5ea9f
--- /dev/null
+++ b/ice40/pack_tests/locals.v
@@ -0,0 +1,27 @@
+module top(input clk, cen, rst, ina, inb, output outa, outb, outc, outd);
+
+reg [31:0] temp = 0;
+
+integer i;
+
+always @(posedge clk)
+begin
+    if (cen) begin
+        if (rst) begin
+            temp <= 0;
+        end else begin
+            temp[0] <= ina;
+            temp[1] <= inb;
+            for (i = 2; i < 32; i++) begin
+                temp[i] <= temp[(i + 3) % 32] ^ temp[(i + 30) % 32] ^ temp[(i + 4) % 16] ^ temp[(i + 2) % 32];
+            end
+        end
+    end
+end
+
+assign outa = temp[3];
+assign outb = temp[5];
+assign outc = temp[9];
+assign outd = temp[15];
+
+endmodule