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diff --git a/tests/ecp5/macc.v b/tests/ecp5/macc.v
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+/*
+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 = 4;
+parameter B_WIDTH = 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