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diff --git a/fpga/usrp2/control_lib/wb_readback_mux.v b/fpga/usrp2/control_lib/wb_readback_mux.v
new file mode 100644
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+++ b/fpga/usrp2/control_lib/wb_readback_mux.v
@@ -0,0 +1,77 @@
+//
+// Copyright 2011 Ettus Research LLC
+//
+// This program is free software: you can redistribute it and/or modify
+// it under the terms of the GNU General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+//
+// This program is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU General Public License for more details.
+//
+// You should have received a copy of the GNU General Public License
+// along with this program.  If not, see <http://www.gnu.org/licenses/>.
+//
+
+
+
+// Note -- clocks must be synchronous (derived from the same source)
+// Assumes alt_clk is running at a multiple of wb_clk
+
+module wb_readback_mux
+  (input wb_clk_i,
+   input wb_rst_i,
+   input wb_stb_i,
+   input [15:0] wb_adr_i,
+   output reg [31:0] wb_dat_o,
+   output reg wb_ack_o,
+   
+   input [31:0] word00,
+   input [31:0] word01,
+   input [31:0] word02,
+   input [31:0] word03,
+   input [31:0] word04,
+   input [31:0] word05,
+   input [31:0] word06,
+   input [31:0] word07,
+   input [31:0] word08,
+   input [31:0] word09,
+   input [31:0] word10,
+   input [31:0] word11,
+   input [31:0] word12,
+   input [31:0] word13,
+   input [31:0] word14,
+   input [31:0] word15
+   );
+
+   always @(posedge wb_clk_i)
+     if(wb_rst_i)
+       wb_ack_o <= 0;
+     else
+       wb_ack_o <= wb_stb_i & ~wb_ack_o;
+   
+   always @(posedge wb_clk_i)
+     case(wb_adr_i[5:2])
+       0 : wb_dat_o <= word00;
+       1 : wb_dat_o <= word01;
+       2 : wb_dat_o <= word02;
+       3 : wb_dat_o <= word03;
+       4 : wb_dat_o <= word04;
+       5 : wb_dat_o <= word05;
+       6 : wb_dat_o <= word06;
+       7 : wb_dat_o <= word07;
+       8 : wb_dat_o <= word08;
+       9 : wb_dat_o <= word09;
+       10: wb_dat_o <= word10;
+       11: wb_dat_o <= word11;
+       12: wb_dat_o <= word12;
+       13: wb_dat_o <= word13;
+       14: wb_dat_o <= word14;
+       15: wb_dat_o <= word15;
+     endcase // case(addr_reg[3:0])
+      
+endmodule // wb_readback_mux
+
+