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//
// 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/>.
//
// 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
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