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diff --git a/usrp2/models/MULT18X18S.v b/usrp2/models/MULT18X18S.v
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+
+// Model of the Xilinx mult18x18s for signed 18x18 bit multiplies,
+// As in the Spartan 3 series
+
+module MULT18X18S
+  (output reg signed [35:0] P,
+   input signed [17:0] A,
+   input signed [17:0] B,
+   input C,    // Clock
+   input CE,   // Clock Enable
+   input R     // Synchronous Reset
+   );
+   
+   always @(posedge C)
+     if(R)
+       P <= 36'sd0;
+     else if(CE)
+       P <= A * B;
+
+endmodule // MULT18X18S