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module simple_gemac_tb;
reg clk = 0;
reg reset = 1;
initial #1000 reset = 0;
always #50 clk = ~clk;
wire GMII_RX_DV, GMII_RX_ER, GMII_TX_EN, GMII_TX_ER, GMII_GTX_CLK;
wire [7:0] GMII_RXD, GMII_TXD;
wire rx_valid, rx_error, rx_ack;
wire tx_ack;
reg tx_valid = 0, tx_error = 0;
wire [7:0] rx_data;
reg [7:0] tx_data;
reg [15:0] pause_time;
reg pause_req = 0;
// reg GMII_RX_CLK;
// always @(GMII_GTX_CLK)
// GMII_RX_CLK <= #30 GMII_GTX_CLK;
wire GMII_RX_CLK = GMII_GTX_CLK;
// Loopback
assign GMII_RX_DV = GMII_TX_EN;
assign GMII_RX_ER = GMII_TX_ER;
assign GMII_RXD = GMII_TXD;
simple_gemac simple_gemac
(.clk125(clk), .reset(reset),
.GMII_GTX_CLK(GMII_GTX_CLK), .GMII_TX_EN(GMII_TX_EN),
.GMII_TX_ER(GMII_TX_ER), .GMII_TXD(GMII_TXD),
.GMII_RX_CLK(GMII_RX_CLK), .GMII_RX_DV(GMII_RX_DV),
.GMII_RX_ER(GMII_RX_ER), .GMII_RXD(GMII_RXD),
.pause_req(pause_req), .pause_time(pause_time),
.rx_clk(rx_clk), .rx_data(rx_data),
.rx_valid(rx_valid), .rx_error(rx_error), .rx_ack(rx_ack),
.tx_clk(tx_clk), .tx_data(tx_data),
.tx_valid(tx_valid), .tx_error(tx_error), .tx_ack(tx_ack)
);
task SendFlowCtrl;
input [15:0] fc_len;
begin
$display("Sending Flow Control, quanta = %d, time = %d", fc_len,$time);
pause_time = fc_len;
@(posedge clk);
pause_req <= 1;
@(posedge clk);
pause_req <= 0;
end
endtask // SendFlowCtrl
reg [31:0] count;
task SendPacket;
input [7:0] data_start;
input [31:0] data_len;
begin
$display("Sending Packet Len=%d, %d", data_len, $time);
count <= 1;
tx_data <= data_start;
tx_error <= 0;
tx_valid <= 1;
while(~tx_ack)
@(posedge tx_clk);
$display("Packet Accepted, %d", $time);
while(count < data_len)
begin
tx_data <= tx_data + 1;
count <= count + 1;
@(posedge clk);
end
tx_valid <= 0;
@(posedge tx_clk);
end
endtask // SendPacket
task SendPacketFromFile;
input [31:0] data_len;
begin
$display("Sending Packet From File Len=%d, %d",data_len,$time);
$readmemh( "test_packet.mem",pkt_rom );
count = 0;
tx_data = pkt_rom[count];
tx_error = 0;
tx_valid = 1;
while(~tx_ack)
@(posedge tx_clk);
$display("Packet Accepted, %d",$time);
count = 1;
while(count < data_len)
begin
tx_data = pkt_rom[count];
count = count + 1;
@(posedge clk);
end
tx_valid <= 0;
@(posedge tx_clk);
end
endtask // SendPacket
initial $dumpfile("simple_gemac_tb.vcd");
initial $dumpvars(0,simple_gemac_tb);
integer i;
reg [7:0] pkt_rom[0:65535];
reg [1023:0] ROMFile;
initial
for (i=0;i<65536;i=i+1)
pkt_rom[i] <= 8'h0;
initial
begin
@(negedge reset);
repeat (10)
@(posedge clk);
SendFlowCtrl(16'h0007); // Send flow control
#30000;
@(posedge clk);
SendFlowCtrl(16'h0009); // Increas flow control before it expires
#10000;
@(posedge clk);
SendFlowCtrl(16'h0000); // Cancel flow control befor it expires
@(posedge clk);
SendPacket(8'hAA,10); // This packet gets dropped by the filters
repeat (10)
@(posedge clk);
SendPacketFromFile(60); // The rest are valid packets
repeat (10)
@(posedge clk);
SendPacketFromFile(61);
repeat (10)
@(posedge clk);
SendPacketFromFile(62);
repeat (10)
@(posedge clk);
SendPacketFromFile(63);
repeat (1)
@(posedge clk);
SendPacketFromFile(64);
repeat (10)
@(posedge clk);
SendPacketFromFile(59);
repeat (1)
@(posedge clk);
SendPacketFromFile(58);
#10000 $finish;
end
always @(posedge clk)
if(GMII_TX_EN)
$display("%x",GMII_TXD);
endmodule // simple_gemac_tb
/*
if ( !$value$plusargs( "rom=%s", ROMFile ) )
begin
$display( "Using default ROM file, 'flash.rom'" );
ROMFile = "flash.rom";
end
else
$display( "Using %s as ROM file.", ROMFile);
#1 $readmemh( ROMFile,rom );
end
*/
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