allow settings bus to cross to a new clock domain, should help timing, but not attached yet

1 files changed, 20 insertions, 0 deletions

diff --git a/usrp2/control_lib/settings_bus_crossclock.v b/usrp2/control_lib/settings_bus_crossclock.v
new file mode 100644
index 000000000..b043aa0ad
--- /dev/null
+++ b/usrp2/control_lib/settings_bus_crossclock.v
@@ -0,0 +1,20 @@
+
+
+// This module takes the settings bus on one clock domain and crosses it over to another domain
+// Typically it will be used with the input settings bus on the wishbone clock, and either 
+// the system or dsp clock on the output side
+
+module settings_bus_crossclock
+  (input clk_i, input rst_i, input set_stb_i, input [7:0] set_addr_i, input [31:0] set_data_i,
+   input clk_o, input rst_o, output set_stb_o, output [7:0] set_addr_o, output [31:0] set_data_o);
+
+   wire  full, empty;
+   
+   fifo_xlnx_16x40_2clk settings_fifo
+     (.rst(rst_i),
+      .wr_clk(clk_i), .din({set_addr_i,set_data_i}), .wr_en(set_stb_i & ~full), .full(full),
+      .rd_clk(clk_o), .dout({set_addr_o,set_data_o}), .rd_en(~empty), .empty(empty));
+
+   assign set_stb_o = ~empty;
+
+endmodule // settings_bus_crossclock