1 files changed, 74 insertions, 0 deletions
diff --git a/fpga/usrp2/control_lib/wb_bus_writer.v b/fpga/usrp2/control_lib/wb_bus_writer.v
new file mode 100644
index 000000000..08e641d37
--- /dev/null
+++ b/fpga/usrp2/control_lib/wb_bus_writer.v
@@ -0,0 +1,74 @@
+//
+// 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/>.
+//
+
+
+// wb_bus_writer
+//
+// WB Bus Master device to send a sequence of single-word transactions
+// based on a list in a RAM or ROM (FASM interface)
+// ROM data format is {WB_ADDR[15:0],WB_DATA[31:0]}
+// continues until it gets an all-1s entry
+
+module wb_bus_writer (input start,
+		      output done,
+		      output reg [15:0] rom_addr,
+		      input [47:0] rom_data,
+		      // WB Master Interface, don't need wb_dat_i
+		      input wb_clk_i,
+		      input wb_rst_i,
+		      output [31:0] wb_dat_o,
+		      input wb_ack_i,
+		      output [15:0] wb_adr_o,
+		      output wb_cyc_o,
+		      output [3:0] wb_sel_o,
+		      output wb_stb_o,
+		      output wb_we_o
+		      );
+
+`define IDLE 0
+`define READ 1
+   
+   reg [3:0] 		     state;
+   
+   assign 		     done = (state != `IDLE) && (&rom_data);  // Done when we see all 1s
+   
+   always @(posedge wb_clk_i)
+     if(wb_rst_i)
+       begin
+	  rom_addr <= #1 0;
+	  state <= #1 0;
+       end
+     else if(start)
+       begin
+	  rom_addr <= #1 0;
+	  state <= #1 `READ;
+       end
+     else if((state == `READ) && wb_ack_i)
+       if(done)
+	 state <= #1 `IDLE;
+       else
+	 rom_addr <= #1 rom_addr + 1;
+   
+   assign wb_dat_o = rom_data[31:0];
+   assign wb_adr_o = rom_data[47:32];
+   assign wb_sel_o = 4'b1111;    // All writes are the full 32 bits
+   
+   assign wb_cyc_o = !done & (state != `IDLE);
+   assign wb_stb_o = !done & (state != `IDLE);
+   assign wb_we_o = !done & (state != `IDLE);
+   
+endmodule // wb_bus_writer