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`timescale 1ns/1ps
module source_flow_control_tb();
reg clk = 0;
reg reset = 1;
always #10 clk = ~clk;
initial $dumpfile("source_flow_control_tb.vcd");
initial $dumpvars(0,source_flow_control_tb);
initial
begin
#1000 reset = 0;
#20000;
$finish;
end
reg [63:0] tdata;
wire [63:0] tdata_int;
reg tlast;
wire tlast_int;
reg tvalid = 1'b0;
wire tvalid_int;
wire tready, tready_int;
reg [63:0] fc_tdata;
reg fc_tlast, fc_tvalid;
wire fc_tready;
wire [63:0] out_tdata;
wire out_tlast, out_tready, out_tvalid;
wire [15:0] occ_in, occ_out;
reg set_stb = 0;
reg [7:0] set_addr;
reg [31:0] set_data;
task send_fc_packet;
input [31:0] seqnum;
input [31:0] sid;
input always_go;
begin
@(posedge clk);
fc_tlast <= 1'b0;
fc_tdata <= { 1'b1, 1'b0, 1'b0, 1'b0, 12'hABC, 16'd4, sid };
fc_tvalid <= 1;
@(posedge clk);
fc_tlast <= 1'b1;
//fc_tdata <= { 52'h0,seqnum };
fc_tdata <= { 31'h0,always_go, seqnum };
@(posedge clk);
fc_tvalid <= 0;
@(posedge clk);
end
endtask // send_packet
task send_packet;
input ec;
input timed;
input [11:0] seqnum;
input [31:0] sid;
input [63:0] vtime;
input [15:0] addr;
input [31:0] data;
begin
// Send a packet
@(posedge clk);
tlast <= 1'b0;
tdata <= { ec, 1'b0, timed, 1'b0, seqnum, timed ? 16'd6 : 16'd4, sid };
tvalid <= 1;
@(posedge clk);
if(timed)
begin
tdata <= vtime;
@(posedge clk);
end
tlast <= 1'b1;
tdata <= { 16'h0, addr, data };
@(posedge clk);
tlast <= 1'b0;
tvalid <= 0;
@(posedge clk);
end
endtask // send_packet
initial
begin
tvalid <= 1'b0;
while(reset)
@(posedge clk);
@(posedge clk);
// Set flow control window to be 2
set_stb <= 1;
set_addr <= 0;
set_data <= 2;
@(posedge clk);
set_stb <= 0;
// ExtContext. Time. Seq=0, SID=DEAD_6789, Time=10
send_packet(1'b1,1'b1,12'h0,32'hDEAD_6789,64'h10,16'hB,32'hF00D_1234);
send_packet(1'b1,1'b1,12'h1,32'hDEAD_6789,64'h20,16'hC,32'hABCD_4321);
send_packet(1'b1,1'b1,12'h2,32'hDEAD_6789,64'h30,16'hC,32'hABCD_4321);
send_packet(1'b1,1'b1,12'h3,32'hDEAD_6789,64'h30,16'hC,32'hABCD_4321);
send_packet(1'b1,1'b1,12'h4,32'hDEAD_6789,64'h30,16'hC,32'hABCD_4321);
send_packet(1'b1,1'b1,12'h5,32'hDEAD_6789,64'h30,16'hC,32'hABCD_4321);
send_packet(1'b1,1'b1,12'h6,32'hDEAD_6789,64'h30,16'hC,32'hABCD_4321);
send_packet(1'b1,1'b1,12'h7,32'hDEAD_6789,64'h30,16'hC,32'hABCD_4321);
send_packet(1'b1,1'b1,12'h8,32'hDEAD_6789,64'h30,16'hC,32'hABCD_4321);
#500;
// Consumed 2 packets
send_fc_packet(32'd1,32'h3,1'b0);
#300;
// Consumed 1 packet
send_fc_packet(32'd2,32'h3,1'b0);
#500;
// Consumed 2 packets
send_fc_packet(32'd4,32'h3,1'b0);
#400;
// Send same SEQ ID again to test it causes no changes.
send_fc_packet(32'd4,32'h3,1'b0);
#300;
// Consumed 1 packet
send_fc_packet(32'd5,32'h3,1'b0);
#500;
// Consumed 2 packets
send_fc_packet(32'd7,32'h3,1'b0);
#500;
send_packet(1'b1,1'b1,12'h9,32'hDEAD_6789,64'h30,16'hC,32'hABCD_4321);
send_packet(1'b1,1'b1,12'hA,32'hDEAD_6789,64'h30,16'hC,32'hABCD_4321);
#300;
// Consumed 1 packet
send_fc_packet(32'd8,32'h3,1'b0);
//
// Now force internal sequence count to close to wrap value to test corner case
//
#100;
source_flow_control.current_seqnum <= 32'hFFFF_FFFC;
#100;
send_fc_packet(32'hFFFF_FFFA,32'h3,1'b0);
#100;
send_packet(1'b1,1'b1,12'hFFC,32'hDEAD_6789,64'h40,16'hC,32'hABCD_4321);
#200;
send_packet(1'b1,1'b1,12'hFFD,32'hDEAD_6789,64'h40,16'hC,32'hABCD_4321);
send_packet(1'b1,1'b1,12'hFFE,32'hDEAD_6789,64'h40,16'hC,32'hABCD_4321);
send_packet(1'b1,1'b1,12'hFFF,32'hDEAD_6789,64'h40,16'hC,32'hABCD_4321);
send_packet(1'b1,1'b1,12'h000,32'hDEAD_6789,64'h40,16'hC,32'hABCD_4321);
send_packet(1'b1,1'b1,12'h001,32'hDEAD_6789,64'h40,16'hC,32'hABCD_4321);
send_packet(1'b1,1'b1,12'h002,32'hDEAD_6789,64'h40,16'hC,32'hABCD_4321);
#200;
// Consumed 2 packets
send_fc_packet(32'hFFFF_FFFC,32'h3,1'b0);
#200;
// Consumed 2 packets
send_fc_packet(32'hFFFF_FFFE,32'h3,1'b0);
send_packet(1'b1,1'b1,12'h003,32'hDEAD_6789,64'h40,16'hC,32'hABCD_4321);
send_packet(1'b1,1'b1,12'h004,32'hDEAD_6789,64'h40,16'hC,32'hABCD_4321);
#200;
// Consumed 2 packets
send_fc_packet(32'h0,32'h3,1'b0);
#200;
// Consumed 2 packets
send_fc_packet(32'h2,32'h3,1'b0);
#500;
//
// Again force internal sequence count to close to wrap value to test new corner case
//
#100;
source_flow_control.current_seqnum <= 32'hFFFF_FFFC;
#100;
send_fc_packet(32'hFFFF_FFFA,32'h3,1'b0);
#100;
send_packet(1'b1,1'b1,12'hFFC,32'hDEAD_6789,64'h40,16'hC,32'hABCD_4321);
#200;
send_packet(1'b1,1'b1,12'hFFD,32'hDEAD_6789,64'h40,16'hC,32'hABCD_4321);
send_packet(1'b1,1'b1,12'hFFE,32'hDEAD_6789,64'h40,16'hC,32'hABCD_4321);
send_packet(1'b1,1'b1,12'hFFF,32'hDEAD_6789,64'h40,16'hC,32'hABCD_4321);
send_packet(1'b1,1'b1,12'h000,32'hDEAD_6789,64'h40,16'hC,32'hABCD_4321);
send_packet(1'b1,1'b1,12'h001,32'hDEAD_6789,64'h40,16'hC,32'hABCD_4321);
send_packet(1'b1,1'b1,12'h002,32'hDEAD_6789,64'h40,16'hC,32'hABCD_4321);
#200;
// Consumed 1 packets
send_fc_packet(32'hFFFF_FFFB,32'h3,1'b0);
#200;
// Consumed 1 packets
send_fc_packet(32'hFFFF_FFFC,32'h3,1'b0);
send_packet(1'b1,1'b1,12'h003,32'hDEAD_6789,64'h40,16'hC,32'hABCD_4321);
send_packet(1'b1,1'b1,12'h004,32'hDEAD_6789,64'h40,16'hC,32'hABCD_4321);
#200;
// Consumed 1 packets
send_fc_packet(32'hFFFF_FFFD,32'h3,1'b0);
#200;
// Consumed 1 packets
send_fc_packet(32'hFFFF_FFFE,32'h3,1'b0);
#200;
// Consumed 1 packets
send_fc_packet(32'hFFFF_FFFF,32'h3,1'b0);
#200;
// Consumed 1 packets
send_fc_packet(32'h0,32'h3,1'b0);
#200;
// Consumed 1 packets
send_fc_packet(32'h1,32'h3,1'b0);
#200;
// Consumed 1 packets
send_fc_packet(32'h2,32'h3,1'b0);
#500;
end
axi_fifo #(.WIDTH(65), .SIZE(10)) fifo_in
(.clk(clk), .reset(reset), .clear(1'b0),
.i_tdata({tlast,tdata}), .i_tvalid(tvalid), .i_tready(tready),
.o_tdata({tlast_int,tdata_int}), .o_tvalid(tvalid_int), .o_tready(tready_int),
.occupied(occ_in));
source_flow_control source_flow_control
(.clk(clk), .reset(reset), .clear(1'b0),
.set_stb(set_stb), .set_addr(set_addr), .set_data(set_data),
.fc_tdata(fc_tdata), .fc_tlast(fc_tlast), .fc_tvalid(fc_tvalid), .fc_tready(fc_tready),
.in_tdata(tdata_int), .in_tlast(tlast_int), .in_tvalid(tvalid_int), .in_tready(tready_int),
.out_tdata(out_tdata), .out_tlast(out_tlast), .out_tvalid(out_tvalid), .out_tready(out_tready)
);
wire [63:0] dump_tdata;
wire dump_tlast, dump_tvalid, dump_tready;
axi_fifo #(.WIDTH(65), .SIZE(10)) fifo_out
(.clk(clk), .reset(reset), .clear(1'b0),
.i_tdata({out_tlast,out_tdata}), .i_tvalid(out_tvalid), .i_tready(out_tready),
.o_tdata({dump_tlast,dump_tdata}), .o_tvalid(dump_tvalid), .o_tready(dump_tready),
.occupied(occ_out));
assign dump_tready = 0;
always @(posedge clk)
if(out_tvalid & out_tready)
begin
$display("%x",out_tdata);
if(out_tlast)
$display("TLAST");
end
endmodule // source_flow_control_tb
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