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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/>.
//
//The following module effects the IO of the DDC chain.
//By default, this entire module is a simple pass-through.
module dsp_rx_glue
#(
//the dsp unit number: 0, 1, 2...
parameter DSPNO = 0,
//frontend bus width
parameter WIDTH = 24
)
(
//control signals
input clock, input reset, input clear, input enable,
//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
//debug output (optional)
output [31:0] debug
);
generate
if (DSPNO==0) begin
`ifndef RX_DSP0_MODULE
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;
`else
`RX_DSP0_MODULE #(.WIDTH(WIDTH)) rx_dsp0_custom
(
.clock(clock), .reset(reset), .clear(clear), .enable(enable),
.set_stb(set_stb), .set_addr(set_addr), .set_data(set_data),
.frontend_i(frontend_i), .frontend_q(frontend_q),
.ddc_in_i(ddc_in_i), .ddc_in_q(ddc_in_q),
.ddc_out_sample(ddc_out_sample), .ddc_out_strobe(ddc_out_strobe), .ddc_out_enable(ddc_out_enable),
.bb_sample(bb_sample), .bb_strobe(bb_strobe)
);
`endif
end
else begin
`ifndef RX_DSP1_MODULE
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;
`else
`RX_DSP1_MODULE #(.WIDTH(WIDTH)) rx_dsp1_custom
(
.clock(clock), .reset(reset), .clear(clear), .enable(enable),
.set_stb(set_stb), .set_addr(set_addr), .set_data(set_data),
.frontend_i(frontend_i), .frontend_q(frontend_q),
.ddc_in_i(ddc_in_i), .ddc_in_q(ddc_in_q),
.ddc_out_sample(ddc_out_sample), .ddc_out_strobe(ddc_out_strobe), .ddc_out_enable(ddc_out_enable),
.bb_sample(bb_sample), .bb_strobe(bb_strobe)
);
`endif
end
endgenerate
endmodule //dsp_rx_glue
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