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//
// Copyright 2014 Ettus Research, a National Instruments Company
//
// SPDX-License-Identifier: LGPL-3.0-or-later
//
// Takes 8-bit wide data on a Local-link fifo interface and converts to 64-bit wide axi
// Parameter START_BYTE controls which byte of the 8 the first incoming byte goes into
// Use START_BYTE=6 with ethernet to nicely align the words for processing of IP packets
// Parameter LABEL specifies a value to put in the high word of the very first packet.
// This is useful for labeling packets with the port it came from so downstream knows
// how to process it. LABEL gets overwritten if START_BYTE = 0
module ll8_to_axi64
#(parameter START_BYTE=6,
parameter LABEL=8'h00)
(input clk, input reset, input clear,
input [7:0] ll_data, input ll_eof, input ll_error, input ll_src_rdy, output ll_dst_rdy,
output [63:0] axi64_tdata, output axi64_tlast, output [3:0] axi64_tuser, output axi64_tvalid, input axi64_tready);
wire error_int, eof_int;
wire [7:0] data_int;
wire valid_int, ready_int;
axi_fifo_short #(.WIDTH(10)) ll8_fifo
(.clk(clk), .reset(reset), .clear(0),
.i_tdata({ll_error, ll_eof, ll_data}), .i_tvalid(ll_src_rdy), .i_tready(ll_dst_rdy),
.o_tdata({error_int, eof_int, data_int}), .o_tvalid(valid_int), .o_tready(ready_int),
.space(), .occupied());
wire [7:0] label_wire = LABEL; // Enforces parameter width
reg [3:0] state = START_BYTE;
reg [63:0] holding; // = {label_wire, 56'h0};
reg err, eof, done;
reg [3:0] occ;
localparam WAIT = 4'd8;
always @(posedge clk)
if(reset | clear)
begin
state <= START_BYTE;
holding <= {56'h0, label_wire};
err <= 1'b0;
eof <= 1'b0;
occ <= 3'd0;
done <= 1'b0;
end
else
if(state == WAIT)
begin
state <= START_BYTE;
done <= 1'b0;
holding <= {56'h0, label_wire};
end
else if(valid_int & ready_int)
begin
holding[state*8 +: 8] <= data_int;
err <= error_int;
eof <= eof_int;
if(error_int | eof_int)
begin
occ <= state+1;
done <= 1'b1;
state <= WAIT;
end
else if (state == 4'd7)
begin
occ <= 3'd0;
done <= 1'b1;
state <= 4'd0;
end
else
begin
occ <= 3'd0;
done <= 1'b0;
state <= state + 4'd1;
end // else: !if(state == 4'd7)
end // if (valid_int & ready_int)
else
done <= 1'b0;
assign axi64_tdata = holding;
assign axi64_tlast = eof;
assign axi64_tuser[3] = err;
assign axi64_tuser[2:0] = occ;
assign ready_int = axi64_tready & (state != WAIT);
assign axi64_tvalid = done;
endmodule // ll8_to_axi64
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