1 files changed, 47 insertions, 0 deletions
diff --git a/tests/arch/ice40/macc.v b/tests/arch/ice40/macc.v
new file mode 100644
index 000000000..6f68e7500
--- /dev/null
+++ b/tests/arch/ice40/macc.v
@@ -0,0 +1,47 @@
+/*
+Example from: https://www.latticesemi.com/-/media/LatticeSemi/Documents/UserManuals/EI/iCEcube201701UserGuide.ashx?document_id=52071 [p. 77].
+*/
+module top(clk,a,b,c,set);
+parameter A_WIDTH = 6 /*4*/;
+parameter B_WIDTH = 6 /*3*/;
+input set;
+input clk;
+input signed [(A_WIDTH - 1):0] a;
+input signed [(B_WIDTH - 1):0] b;
+output signed [(A_WIDTH + B_WIDTH - 1):0] c;
+reg [(A_WIDTH + B_WIDTH - 1):0] reg_tmp_c;
+assign c = reg_tmp_c;
+always @(posedge clk)
+begin
+    if(set)
+    begin
+        reg_tmp_c <= 0;
+    end
+    else
+    begin
+        reg_tmp_c <= a * b + c;
+    end
+end
+endmodule
+
+module top2(clk,a,b,c,hold);
+parameter A_WIDTH = 6 /*4*/;
+parameter B_WIDTH = 6 /*3*/;
+input hold;
+input clk;
+input signed [(A_WIDTH - 1):0] a;
+input signed [(B_WIDTH - 1):0] b;
+output signed [(A_WIDTH + B_WIDTH - 1):0] c;
+reg signed [A_WIDTH-1:0] reg_a;
+reg signed [B_WIDTH-1:0] reg_b;
+reg [(A_WIDTH + B_WIDTH - 1):0] reg_tmp_c;
+assign c = reg_tmp_c;
+always @(posedge clk)
+begin
+    if (!hold) begin
+        reg_a <= a;
+        reg_b <= b;
+        reg_tmp_c <= reg_a * reg_b + c;
+    end
+end
+endmodule