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//Purpose: to test 8 to 16 converter
`timescale 1ns/1ps
module chdr_8sc_to_16sc_tb();
reg clk = 0;
reg reset = 1;
//generate clock
always #10 clk = ~clk;
initial $dumpfile("chdr_8sc_to_16sc_tb.vcd");
initial $dumpvars(0,chdr_8sc_to_16sc_tb);
//tells when to finish
initial
begin
#50 reset = 0;
#50000;
$finish;
end
//setting registers and wire
reg [63:0] i_tdata;
reg i_tlast = 0;
reg i_tvalid = 0;
wire i_tready ;
reg [7:0] set_addr;
reg [31:0] set_data;
reg set_stb;
wire [63:0] o_tdata;
wire o_tlast;
wire o_tvalid;
reg o_tready;
chdr_8sc_to_16sc #(.BASE(89))dut
(.clk(clk), .reset(reset),
.set_data(set_data), .set_stb(set_stb), .set_addr(set_addr),
.i_tdata(i_tdata), .i_tlast(i_tlast), .i_tvalid(i_tvalid), .i_tready(i_tready),
.o_tdata(o_tdata), .o_tlast(o_tlast), .o_tvalid(o_tvalid), .o_tready(o_tready), .debug());
//if you want to feed a bigger input change array sizes here
reg [63:0] data[0:7];
initial $readmemh("from8_to_x.hex", data);
//test packet loop
task test_packet;
input [15:0] len;
input [31:0] sid;
reg [1:0] index;
begin
index <= 0;
@(posedge clk) ;
//send header
i_tdata <= {1'b0, 1'b0, 1'b1, 1'b0, 12'h0, (len + 16'd16),sid};
i_tvalid <= 1;
i_tlast <= 0;
@(posedge clk);
while (i_tready != 1)
@(posedge clk);
i_tdata <= {64'b0};
@(posedge clk);
while (i_tready != 1)
@(posedge clk);
//-1 for last bit accounting
repeat ( len[15:3] + (len[2]|len[1]|len[0]) - 1 )
begin
i_tdata <= {data[index]};
index <= index+1;
@(posedge clk);
while (i_tready != 1)
@(posedge clk);
end
i_tlast <= 1'b1;
i_tdata <= {data[index]};
@(posedge clk);
while (i_tready != 1)
@(posedge clk);
i_tvalid <= 0;
end
endtask // test_packet
//test_destination loop
task test_destination;
input enable;
input [15:0] dest_home;
begin
@(posedge clk);
set_data <= {enable,dest_home};
set_addr <= 89;
set_stb <= 1;
@(posedge clk);
set_stb <= 0;
end
endtask
//main loop
initial
begin
i_tvalid <= 0;
o_tready <= 1;
i_tdata <= 0;
@(negedge reset);
@(posedge clk);
@(posedge clk);
/* Uncomment to test without changed sid
test_destination(0,16'hFEED);
test_packet(20, 32'hDEAD_BEEF);
*/
test_destination(1,16'hFEED);
test_packet(2, 32'hDEAD_BEEF);
#1000;
test_packet(4, 32'hDEAD_BEEF);
#1000;
test_packet(6, 32'hDEAD_BEEF);
#1000;
test_packet(8, 32'hDEAD_BEEF);
#1000;
test_packet(10, 32'hDEAD_BEEF);
#1000;
test_packet(12, 32'hDEAD_BEEF);
#1000;
test_packet(14, 32'hDEAD_BEEF);
#1000;
test_packet(16, 32'hDEAD_BEEF);
#1000;
end
endmodule
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