Merged r9433:9527 from features/gr-usrp2 into trunk. Adds usrp2 and gr-usrp2 top-level components. Trunk passes distcheck with mb-gcc installed, but currently not without them. The key issue is that when mb-gcc is not installed, the build system skips over the usrp2/firmware directory, and the firmware include files don't get put into the dist tarball. But we can't do the usual DIST_SUBDIRS method as the firmware is a subpackage.

git-svn-id: http://gnuradio.org/svn/gnuradio/trunk@9528 221aa14e-8319-0410-a670-987f0aec2ac5

1 files changed, 20 insertions, 0 deletions

diff --git a/models/MULT18X18S.v b/models/MULT18X18S.v
new file mode 100644
index 000000000..5d39eeaa6
--- /dev/null
+++ b/models/MULT18X18S.v
@@ -0,0 +1,20 @@
+
+// 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