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+/*
+Example from: https://www.latticesemi.com/-/media/LatticeSemi/Documents/UserManuals/EI/iCEcube201701UserGuide.ashx?document_id=52071 [p. 74].
+*/
+module top(data, addr);
+output [3:0] data;
+input [4:0] addr;
+always @(addr) begin
+case (addr)
+0 : data = 'h4;
+1 : data = 'h9;
+2 : data = 'h1;
+15 : data = 'h8;
+16 : data = 'h1;
+17 : data = 'h0;
+default : data = 'h0;
+endcase
+end
+endmodule