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`define FILE_COUNT 10
module tb_random_data_source (
input wire clk,
// output : AXI stream
input wire tready,
output reg tvalid,
output reg [ 7:0] tdata,
output reg tlast
);
initial tvalid = 1'b0;
initial tdata = 1'b0;
initial tlast = 1'b0;
//---------------------------------------------------------------------------------------------------------------------------------------------------------------
// function : generate random unsigned integer
//---------------------------------------------------------------------------------------------------------------------------------------------------------------
function [31:0] randuint;
input [31:0] min;
input [31:0] max;
begin
randuint = $random;
if ( min != 0 || max != 'hFFFFFFFF )
randuint = (randuint % (1+max-min)) + min;
end
endfunction
//---------------------------------------------------------------------------------------------------------------------------------------------------------------
// tasks : send random data
//---------------------------------------------------------------------------------------------------------------------------------------------------------------
task gen_chunk_rand;
input [31:0] max_bubble_cnt;
input [31:0] length;
input [ 7:0] min;
input [ 7:0] max;
begin
while (length>0) begin
@ (posedge clk);
if (tready) begin
repeat (randuint(0, max_bubble_cnt)) begin
tvalid <= 1'b0;
@ (posedge clk);
end
end
if (~tvalid | tready) begin
length = length - 1;
tvalid <= 1'b1;
tlast <= 1'b0;
tdata <= randuint(min, max);
end
end
end
endtask
task gen_chunk_sqrt4_rand;
input [31:0] max_bubble_cnt;
input [31:0] length;
begin
while (length>0) begin
@ (posedge clk);
if (tready) begin
repeat (randuint(0, max_bubble_cnt)) begin
tvalid <= 1'b0;
@ (posedge clk);
end
end
if (~tvalid | tready) begin
length = length - 1;
tvalid <= 1'b1;
tlast <= 1'b0;
tdata <= $sqrt($sqrt(randuint(0, 'hFFFFFFFF)));
end
end
end
endtask
task gen_chunk_inc;
input [31:0] max_bubble_cnt;
input [31:0] length;
input [ 7:0] min;
input [ 7:0] max;
begin
while (length>0) begin
@ (posedge clk);
if (tready) begin
repeat (randuint(0, max_bubble_cnt)) begin
tvalid <= 1'b0;
@ (posedge clk);
end
end
if (~tvalid | tready) begin
length = length - 1;
tvalid <= 1'b1;
tlast <= 1'b0;
if ( randuint(0,1) )
tdata <= tdata + randuint(min, max);
else
tdata <= tdata - randuint(min, max);
end
end
end
endtask
task gen_chunk_scatter;
input [31:0] max_bubble_cnt;
input [31:0] length;
input [31:0] prob;
begin
while (length>0) begin
@ (posedge clk);
if (tready) begin
repeat (randuint(0, max_bubble_cnt)) begin
tvalid <= 1'b0;
@ (posedge clk);
end
end
if (~tvalid | tready) begin
length = length - 1;
tvalid <= 1'b1;
tlast <= 1'b0;
if ( randuint(0, prob) == 0 )
tdata <= randuint(1, 255);
else
tdata <= 8'h0;
end
end
end
endtask
task gen_stream;
input [31:0] length;
input [31:0] max_bubble_cnt;
reg [31:0] remain_length;
reg [31:0] chunk_length;
reg [ 7:0] min;
reg [ 7:0] max;
begin
if (length > 0) begin
remain_length = length - 1;
while (remain_length > 0) begin
chunk_length = randuint(1, 10000);
if (chunk_length > remain_length)
chunk_length = remain_length;
remain_length = remain_length - chunk_length;
case ( randuint(0, 3) )
0 : begin
min = randuint(0 , 255);
max = randuint(min, 255);
gen_chunk_rand (max_bubble_cnt, chunk_length, min, max);
end
1 :
gen_chunk_sqrt4_rand(max_bubble_cnt, chunk_length);
2 : begin
min = randuint(1 , 3);
max = randuint(min, 4);
gen_chunk_inc (max_bubble_cnt, chunk_length, min, max);
end
default :
gen_chunk_scatter (max_bubble_cnt, chunk_length, randuint(1, 600));
endcase
end
remain_length = 1;
while (remain_length>0) begin
@ (posedge clk);
if (~tvalid | tready) begin
remain_length = 0;
tvalid <= 1'b1;
tlast <= 1'b1;
tdata <= randuint(0,255);
end
end
end
end
endtask
//---------------------------------------------------------------------------------------------------------------------------------------------------------------
// send random data
//---------------------------------------------------------------------------------------------------------------------------------------------------------------
initial begin
repeat (1000) @ (posedge clk);
repeat (`FILE_COUNT) begin
case ( randuint(0,7) )
0 : gen_stream(randuint(32, 1000000) , randuint(0,3) );
1 : gen_stream(32 +randuint(0,2) , randuint(0,3) );
2 : gen_stream(4095+randuint(0,2) , randuint(0,3) );
3 : gen_stream(randuint(1, 2)*16384 - 1 , randuint(0,3) );
4 : gen_stream(randuint(1, 2)*16384 , randuint(0,3) );
5 : gen_stream(randuint(1, 2)*16384 + 1 , randuint(0,3) );
6 : gen_stream(randuint(9,20)*16384 + 1 , randuint(0,3) );
7 : gen_stream(randuint(32, 32768) , randuint(50,100) );
8 : gen_stream(randuint(1,31) , randuint(0,3) ); // the stream shorter than 32 will be ignore
endcase
end
@ (posedge clk);
while ( !(~tvalid | tready) ) begin
@ (posedge clk);
end
tvalid <= 1'b0;
end
endmodule
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