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//
// Copyright 2014 Ettus Research LLC
// Copyright 2018 Ettus Research, a National Instruments Company
//
// SPDX-License-Identifier: LGPL-3.0-or-later
//
module chdr_16sc_to_8sc
#(parameter BASE=0)
(input clk, input reset,
input set_stb, input [7:0] set_addr, input [31:0] set_data,
//input side of device
input [63:0] i_tdata,
input i_tlast,
input i_tvalid,
output i_tready,
//output side of device
output reg [63:0] o_tdata,
output o_tlast,
output o_tvalid,
input o_tready,
output [31:0] debug
);
//pipeline register
reg [63:0] hold_tdata;
//bit assignments
wire chdr_has_hdr = 1'b1;
wire chdr_has_time = i_tdata[61];
wire chdr_has_tlr = 1'b0;
wire [7:0] rounded_i1;
wire [7:0] rounded_q1;
wire [7:0] rounded_i0;
wire [7:0] rounded_q0;
wire [7:0] rounded_i2;
wire [7:0] rounded_q2;
wire [7:0] rounded_i3;
wire [7:0] rounded_q3;
//chdr length calculations
wire [15:0] chdr_header_lines8 = chdr_has_time? 16 : 8;
wire [15:0] chdr_almost_payload_lines8 = ((i_tdata[47:32] - chdr_header_lines8) >> 1);
wire [15:0] chdr_payload_lines8 = chdr_almost_payload_lines8 + chdr_header_lines8;
wire [15:0] my_newhome;
wire set_sid;
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]}));
localparam HEADER = 2'd0;//IDLE
localparam TIME = 2'd1;
localparam ODD = 2'd2;
localparam EVEN = 2'd3;
reg [1:0] state;
always @(posedge clk) begin
if (reset) begin
state <= HEADER;
hold_tdata <= 0;
end
else case(state)
HEADER: begin
if (i_tvalid && o_tready) begin
state <= (i_tdata[61])? TIME : ODD;
end
end
TIME: begin
if (i_tvalid && o_tready) begin
state <= (i_tlast)? HEADER: ODD;
hold_tdata <= i_tdata;
end
end
ODD: begin
if (i_tvalid) begin
if (i_tlast) begin
if(o_tready)
state <= HEADER;
end
else begin
state <= EVEN;
hold_tdata <= i_tdata;
end
end
end
EVEN: begin
if (i_tvalid && o_tready)
state <= (i_tlast) ? HEADER: ODD;
hold_tdata <= i_tdata;
end
default: state <= HEADER;
endcase
end
//assign 8 bit i and q signals from this line and last
//new data processing
round #(.bits_in(16),
.bits_out(8))
round_i2
(.in(i_tdata[63:48]),
.out(rounded_i2[7:0])
);
round #(.bits_in(16),
.bits_out(8))
round_q2
(.in(i_tdata[47:32]),
.out(rounded_q2[7:0])
);
round #(.bits_in(16),
.bits_out(8))
round_i3
(.in(i_tdata[31:16]),
.out(rounded_i3[7:0])
);
round #(.bits_in(16),
.bits_out(8))
round_q3
(.in(i_tdata[15:0]),
.out(rounded_q3[7:0])
);
// old data processing
round #(.bits_in(16),
.bits_out(8))
round_i0(.in(hold_tdata[63:48]), .out(rounded_i0[7:0])
);
round #(.bits_in(16),
.bits_out(8))
round_q0
(.in(hold_tdata[47:32]),
.out(rounded_q0[7:0])
);
round #(.bits_in(16),
.bits_out(8))
round_i1
(.in(hold_tdata[31:16]),
.out(rounded_i1[7:0])
);
round #(.bits_in(16),
.bits_out(8))
round_q1
(.in(hold_tdata[15:0]),
.out(rounded_q1[7:0])
);
// main mux
always @(*)
case(state)
HEADER: o_tdata = {i_tdata[63:48], chdr_payload_lines8,
set_sid ? {i_tdata[15:0], my_newhome[15:0]}:i_tdata[31:0]};
TIME: o_tdata = i_tdata;
ODD: o_tdata = {rounded_i2, rounded_q2, rounded_i3, rounded_q3,rounded_i0, rounded_q0, rounded_i1, rounded_q1};
EVEN: o_tdata = {rounded_i0, rounded_q0, rounded_i1, rounded_q1,rounded_i2, rounded_q2, rounded_i3, rounded_q3};
default : o_tdata = i_tdata;
endcase
assign o_tvalid = i_tvalid && (state != ODD || i_tlast);
assign i_tready = o_tready || (state == ODD && !i_tlast);
assign o_tlast = i_tlast;
endmodule
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