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//
// Copyright 2013 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/>.
//
module chdr_16sc_to_32f
#(parameter BASE=0)
( input clk, input reset, input set_stb, input [7:0] set_addr,
input [31:0] set_data,
input [63:0] i_tdata,
input i_tlast,
input i_tvalid,
output i_tready,
output reg [63:0] o_tdata,
output o_tlast,
output o_tvalid,
input o_tready,
output [31:0] debug
);
wire [31:0] s0_real;
wire [31:0] s0_imag;
wire [31:0] s1_real;
wire [31:0] s1_imag;
wire chdr_has_hdr = 1'b1;
wire chdr_has_time = i_tdata[61];
wire chdr_has_tlr = 1'b0;
//chdr length calculations
wire [15:0] chdr_header_lines = chdr_has_time? 16:8;
wire [15:0] samples = ((i_tdata[47:32] - chdr_header_lines) << 1);
wire [15:0] i_samples = (i_tdata[47:32] - chdr_header_lines);
wire [15:0] chdr_payload_lines = samples + chdr_header_lines;
wire set_sid;
wire [15:0] my_newhome;
setting_reg #(.my_addr(BASE), .width(17)) new_destination
(.clk(clk), .rst(reset), .strobe(set_stb), .addr(set_addr), .in(set_data),.out({set_sid, my_newhome[15:0]}));
//state machines
localparam HEADER = 2'd0;//IDLE
localparam TIME = 2'd1;
localparam ODD = 2'd2;
localparam EVEN = 2'd3;
reg [1:0] state;
reg end_on_odd;
always @(posedge clk) begin
if (reset) begin
state <= HEADER;
end_on_odd <= 1'b0;
end
else if (o_tready && i_tvalid) case(state)
HEADER: begin
state <= (i_tdata[61])? TIME : ODD;
end_on_odd <= (i_samples[2:1] == 2 || i_samples[2:1] == 1);
end
TIME: begin
state <= (i_tlast)? HEADER: ODD;
end
ODD: begin
state <= (i_tlast & end_on_odd)? HEADER:EVEN;
end
EVEN: begin
state <= (i_tlast) ? HEADER: ODD;
end
default: state <= HEADER;
endcase
end
iq_to_float #(.BITS_IN(16), .BITS_OUT(32))
iq_to_float_imag0 (.in(i_tdata[63:48]), .out(s0_imag[31:0]));
iq_to_float #(.BITS_IN(16), .BITS_OUT(32))
iq_to_float_real0 (.in(i_tdata[47:32]), .out(s0_real[31:0]));
iq_to_float #(.BITS_IN(16), .BITS_OUT(32))
iq_to_float_imag1 (.in(i_tdata[31:16]), .out(s1_imag[31:0]));
iq_to_float #(.BITS_IN(16), .BITS_OUT(32))
iq_to_float_real1 (.in(i_tdata[15:0]), .out(s1_real[31:0]));
always @(*)
case(state)
HEADER: o_tdata <= {i_tdata[63:48], chdr_payload_lines,
set_sid ? {i_tdata[15:0], my_newhome[15:0]}:i_tdata[31:0]};
TIME: o_tdata <= i_tdata;
ODD: o_tdata <= {s0_imag,s0_real};
EVEN: o_tdata <= {s1_imag,s1_real};
default : o_tdata = i_tdata;
endcase
assign o_tvalid = i_tvalid;
assign i_tready = o_tready && ((state != ODD) || (i_tlast && end_on_odd));
assign o_tlast = i_tlast && ((state == EVEN) || (state == ODD && end_on_odd));
endmodule
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