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//
// Copyright 2012 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/>.
//
//COPY ME, CUSTOMIZE ME...
//The following module effects the IO of the DDC chain.
//By default, this entire module is a simple pass-through.
//To implement DSP logic before the DDC:
//Implement custom DSP between frontend and ddc input.
//To implement DSP logic after the DDC:
//Implement custom DSP between ddc output and baseband.
//To bypass the DDC with custom logic:
//Implement custom DSP between frontend and baseband.
module custom_dsp_rx
#(
//frontend bus width
parameter WIDTH = 24
)
(
//control signals
input clock, //dsp clock
input reset, //active high synchronous reset
input clear, //active high on packet control init
input enable, //active high when streaming enabled
//user settings bus, controlled through user setting regs API
input set_stb, input [7:0] set_addr, input [31:0] set_data,
//full rate inputs directly from the RX frontend
input [WIDTH-1:0] frontend_i,
input [WIDTH-1:0] frontend_q,
//full rate outputs directly to the DDC chain
output [WIDTH-1:0] ddc_in_i,
output [WIDTH-1:0] ddc_in_q,
//strobed samples {I16,Q16} from the RX DDC chain
input [31:0] ddc_out_sample,
input ddc_out_strobe, //high on valid sample
output ddc_out_enable, //enables DDC module
//strobbed baseband samples {I16,Q16} from this module
output [31:0] bb_sample,
output bb_strobe //high on valid sample
);
assign ddc_in_i = frontend_i;
assign ddc_in_q = frontend_q;
assign bb_sample = ddc_out_sample;
assign bb_strobe = ddc_out_strobe;
assign ddc_out_enable = enable;
endmodule //custom_dsp_rx
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