Here is an example of a three bit multiplication in Verilog made to fit into a EPM7160SLC84-10.
I think I wrote a four bit one that I will try to find.
/***************************** Description of Multiplier: Three bit multiplication with macrocell count. ------------------------------ Date: 2.28.2006 Version: 1.0 *****************************/ module multiplier( valA, valB, result ); /***************************** Inputs: *****************************/ input [2:0] valA; input [2:0] valB; /***************************** Outputs: *****************************/ output [7:0] A; /***************************** Wires: *****************************/ wire [5:0] mp0, mp1, mp2; assign mp0 = (valB[0]) ? { 2'b00, valA } : 5'b00000; assign mp1 = (valB[1]) ? { 1'b0, valA, 1'b0 } : 5'b00000; assign mp2 = (valB[2]) ? { valA, 2'b00 } : 5'b00000; assign result = mp0 + mp1 + mp2; endmodule