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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_12sc_to_16sc
#(parameter BASE = 0)
( input set_stb, input [7:0] set_addr, input [31:0] set_data,
//input side of device
input clk, input reset,
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
);
wire chdr_has_hdr = 1'b1;
wire chdr_has_time = i_tdata[61];
wire chdr_has_tlr = 1'b0;
wire [15:0] chdr_header_lines = chdr_has_time? 16 : 8;
wire [15:0] just_samples_in = i_tdata[47:32] - chdr_header_lines;
//calculating output length based on input ( 4/3*input = output)
wire [30:0] calc_output_len = ({just_samples_in,14'h0} + {just_samples_in,12'h0} + {just_samples_in,10'h0} + {just_samples_in,8'h0} + {just_samples_in,6'h0} + {just_samples_in,4'h0} + {just_samples_in,2'h0}+{just_samples_in} +'b0001000000000000)<<2;
wire [15:0] samples = calc_output_len[30:16];
wire [15:0] chdr_payload_lines = samples + chdr_header_lines;
reg has_exline;
reg in_exline;
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]}));
localparam HEADER = 3'd0; // IDLE
localparam TIME = 3'd1;
localparam ODD_LINE_ZERO = 3'd2;
localparam EVEN_LINE_ONE = 3'd3;
localparam ODD_LINE_TWO = 3'd4;
localparam EVEN_LINE_THREE = 3'd5;
reg [2:0] state;
always @(posedge clk) begin
if (reset) begin
state <= HEADER;
end
else if (o_tvalid && o_tready) case(state)
HEADER: begin
has_exline <= ( (samples[4:2] == 5) || (samples[4:2] == 7) || (samples[4:2] == 0));
state <= (chdr_has_time)? TIME : ODD_LINE_ZERO;
end
TIME: begin
state <= (i_tlast)? HEADER: ODD_LINE_ZERO;
end
ODD_LINE_ZERO: begin
if ((i_tlast & !has_exline) || in_exline) begin
state <= HEADER;
in_exline <= 0;
end
else if (i_tlast & has_exline) begin
in_exline <= 1;
state <= EVEN_LINE_ONE;
end
else
state <= EVEN_LINE_ONE;
end
EVEN_LINE_ONE: begin
if ((i_tlast & !has_exline) || in_exline) begin
state <= HEADER;
in_exline <= 0;
end
else if (i_tlast & has_exline) begin
in_exline <= 1;
state <= ODD_LINE_TWO;
end
else
state <= ODD_LINE_TWO;
end
ODD_LINE_TWO: begin
if ((i_tlast & !has_exline) || in_exline) begin
state <= HEADER;
in_exline <= 0;
end
else if (i_tlast & has_exline) begin
in_exline <= 1;
state <= EVEN_LINE_THREE;
end
else
state <= EVEN_LINE_THREE;
end
EVEN_LINE_THREE: begin
if (in_exline) begin
state <= HEADER;
in_exline <= 0;
end
else
state <= ODD_LINE_ZERO;
end
default: state <= HEADER;
endcase
end
//hold data after each input xfer
reg [63:0] hold_tdata;
always @(posedge clk) begin
if (i_tvalid && i_tready) hold_tdata <= i_tdata;
end
//main mux
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_LINE_ZERO: o_tdata <= {i_tdata[63:52], 4'h0, i_tdata[51:40], 4'h0, i_tdata[39:28],4'h0, i_tdata[27:16], 4'h0};
EVEN_LINE_ONE: o_tdata <= {hold_tdata[15:4],4'h0,hold_tdata[3:0],i_tdata[63:56],4'h0,i_tdata[55:44], 4'h0,i_tdata[43:32],4'h0};
ODD_LINE_TWO: o_tdata <= {hold_tdata[31:20], 4'h0, hold_tdata[19:8],4'h0, hold_tdata[7:0],i_tdata[63:60],4'h0,i_tdata[59:48],4'h0};
EVEN_LINE_THREE: o_tdata <= {hold_tdata[47:36],4'h0,hold_tdata[35:24],4'h0,hold_tdata[23:12],4'h0,hold_tdata[11:0],4'h0};
default: o_tdata <= i_tdata;
endcase
assign o_tvalid = (in_exline)? 1'b1: i_tvalid;
assign i_tready = (state != EVEN_LINE_THREE) & o_tready & !in_exline;
assign o_tlast = (has_exline)? in_exline: ((state != EVEN_LINE_THREE) && i_tlast);
endmodule
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