From bb0572a960edf54486a4be746c681adaac0fa398 Mon Sep 17 00:00:00 2001 From: Josh Blum Date: Tue, 23 Nov 2010 13:36:42 -0800 Subject: fpga: performed a forceful checkout of fpga to overwrite with current fpga code --- fpga/usrp2/control_lib/settings_bus_16LE.v | 54 ++++++++++++++++++++++++++++++ 1 file changed, 54 insertions(+) create mode 100644 fpga/usrp2/control_lib/settings_bus_16LE.v (limited to 'fpga/usrp2/control_lib/settings_bus_16LE.v') diff --git a/fpga/usrp2/control_lib/settings_bus_16LE.v b/fpga/usrp2/control_lib/settings_bus_16LE.v new file mode 100644 index 000000000..76061e9e0 --- /dev/null +++ b/fpga/usrp2/control_lib/settings_bus_16LE.v @@ -0,0 +1,54 @@ + +// Grab settings off the wishbone bus, send them out to settings bus +// 16 bits little endian, but all registers need to be written 32 bits at a time. +// This means that you write the low 16 bits first and then the high 16 bits. +// The setting regs are strobed when the high 16 bits are written + +module settings_bus_16LE + #(parameter AWIDTH=16, RWIDTH=8) + (input wb_clk, + input wb_rst, + input [AWIDTH-1:0] wb_adr_i, + input [15:0] wb_dat_i, + input wb_stb_i, + input wb_we_i, + output reg wb_ack_o, + output strobe, + output reg [7:0] addr, + output reg [31:0] data); + + reg stb_int; + + always @(posedge wb_clk) + if(wb_rst) + begin + stb_int <= 1'b0; + addr <= 8'd0; + data <= 32'd0; + end + else if(wb_we_i & wb_stb_i) + begin + addr <= wb_adr_i[RWIDTH+1:2]; // Zero pad high bits + if(wb_adr_i[1]) + begin + stb_int <= 1'b1; // We now have both halves + data[31:16] <= wb_dat_i; + end + else + begin + stb_int <= 1'b0; // Don't strobe, we need other half + data[15:0] <= wb_dat_i; + end + end + else + stb_int <= 1'b0; + + always @(posedge wb_clk) + if(wb_rst) + wb_ack_o <= 0; + else + wb_ack_o <= wb_stb_i & ~wb_ack_o; + + assign strobe = stb_int & wb_ack_o; + +endmodule // settings_bus_16LE -- cgit v1.2.3