写一个异步fifod的uvm验证程序
时间: 2023-10-05 08:10:18 浏览: 66
以下是一个简单的异步FIFO的UVM验证程序示例:
首先定义FIFO的接口:
```systemverilog
interface fifo_if(input logic clk);
logic [7:0] data_in;
logic [7:0] data_out;
logic wr_en;
logic rd_en;
logic full;
logic empty;
endinterface
```
接着定义FIFO的实现:
```systemverilog
module fifo(input logic clk, rst,
input logic [7:0] data_in,
input logic wr_en, rd_en,
output logic [7:0] data_out,
output logic full, empty);
logic [7:0] buffer [0:7];
int wr_ptr = 0;
int rd_ptr = 0;
int count = 0;
always_ff @(posedge clk) begin
if (rst) begin
buffer <= '0;
wr_ptr <= 0;
rd_ptr <= 0;
count <= 0;
end else begin
if (wr_en && !full) begin
buffer[wr_ptr] <= data_in;
wr_ptr <= (wr_ptr == 7) ? 0 : wr_ptr + 1;
count <= count + 1;
end
if (rd_en && !empty) begin
data_out <= buffer[rd_ptr];
rd_ptr <= (rd_ptr == 7) ? 0 : rd_ptr + 1;
count <= count - 1;
end
end
end
assign full = (count == 8);
assign empty = (count == 0);
endmodule
```
接着定义FIFO的测试:
```systemverilog
class tb_fifo extends uvm_test;
fifo_if dut;
uvm_blocking_put_port #(byte) put_port;
uvm_blocking_get_port #(byte) get_port;
uvm_analysis_port #(byte) analysis_port;
function new(string name, uvm_component parent);
super.new(name, parent);
endfunction
virtual function void build_phase(uvm_phase phase);
super.build_phase(phase);
dut = new("dut", null);
put_port = new("put_port", this);
get_port = new("get_port", this);
analysis_port = new("analysis_port", this);
// Connect the DUT to the testbench
dut.clk = clk;
put_port.connect(dut);
get_port.connect(dut);
endfunction
virtual task run_phase(uvm_phase phase);
// Test FIFO with 10 random data items
for (int i = 0; i < 10; i++) begin
byte data = $random;
put_data(data);
get_data(data);
end
endtask
virtual task put_data(byte data);
// Put data into FIFO
if (put_port.try_put(data)) begin
`uvm_info(get_type_name(), $sformatf("Put data: %0h", data), UVM_LOW)
end else begin
`uvm_error(get_type_name(), "Failed to put data into FIFO")
end
endtask
virtual task get_data(byte expected_data);
// Get data from FIFO
byte data;
if (get_port.try_get(data)) begin
`uvm_info(get_type_name(), $sformatf("Got data: %0h", data), UVM_LOW)
if (data == expected_data) begin
analysis_port.write(data);
end else begin
`uvm_error(get_type_name(), "Data mismatch")
end
end else begin
`uvm_error(get_type_name(), "Failed to get data from FIFO")
end
endtask
endclass
```
最后,我们需要定义一个分析器来检查FIFO的输出是否与输入匹配:
```systemverilog
class fifo_analyzer extends uvm_analysis_port #(byte);
function new(string name, uvm_component parent);
super.new(name, parent);
endfunction
virtual function void write(byte t);
// Check if the output matches the input
if (t != dut.data_in) begin
`uvm_error(get_type_name(), "Output does not match input")
end
endfunction
endclass
```
现在我们可以运行测试来验证FIFO的正确性:
```systemverilog
module test;
initial begin
uvm_config_db #(virtual fifo_if)::set(null, "*", "dut", dut);
uvm_config_db #(uvm_object_wrapper)::set(null, "tb_fifo.*", "default_sequence", fifo_sequence::type_id::get());
uvm_top.print_topology();
run_test();
end
endmodule
```
这个测试程序会运行FIFO序列,然后检查输出是否与输入匹配。如果没有错误,测试就通过了。
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