Squashed B200 FPGA Source. Code from Josh Blum, Ian Buckley, and Matt Ettus.

Original-commit: 0df4b801a34697f2058b4a7b95e08d2a0576c9db

lib/wishbone/settings_readback.v

@@ -0,0 +1,40 @@
+//
+// Copyright 2011-2012 Ettus Research LLC
+//
+
+
+//
+// Use this module in conjunction with settings_bus.v to add stateful reads
+// to the settings bis. This enables you to do things like have registers reset atomicly
+// as they are read. It also pipelines the address path to ease timing.
+//
+
+module settings_readback
+  #(parameter AWIDTH=16, parameter DWIDTH=32, parameter RB_ADDRW=2)
+   (
+    input wb_clk, 
+    input wb_rst, 
+    input [AWIDTH-1:0] wb_adr_i,
+    input wb_stb_i,
+    input wb_we_i,
+    input [DWIDTH-1:0] rb_data,
+    output reg [RB_ADDRW-1:0] rb_addr,
+    output [DWIDTH-1:0] wb_dat_o,
+    output reg rb_rd_stb
+    );
+
+   always @(posedge wb_clk)
+     if (wb_stb_i && ~wb_we_i) begin
+	rb_addr <= wb_adr_i[RB_ADDRW+1:2];
+	rb_rd_stb <= 1'b1;	
+     end else begin
+	rb_rd_stb <= 1'b0;	
+     end
+   
+   assign wb_dat_o = rb_data;
+
+   
+
+endmodule // settings_readback
+
+