使用UVM自带的bit bash写一个测寄存器的测例
时间: 2024-06-11 14:09:21 浏览: 29
以下是一个简单的使用UVM自带的bit bash测试寄存器的例子:
```systemverilog
class reg_model extends uvm_reg_block;
// 定义寄存器和寄存器字段
`uvm_register_cb(reg_model)
uvm_reg_field fld1;
uvm_reg_field fld2;
function new(string name = "reg_model");
super.new(name, 32, UVM_NO_COVERAGE);
fld1 = uvm_reg_field::type_id::create("fld1");
fld1.configure(this, 0, 16, "RW");
fld2 = uvm_reg_field::type_id::create("fld2");
fld2.configure(this, 16, 16, "RW");
endfunction
endclass
class reg_access_test extends uvm_test;
reg_model reg_mod;
function new(string name = "reg_access_test", uvm_component parent = null);
super.new(name, parent);
endfunction
virtual function void build_phase(uvm_phase phase);
// 创建寄存器模型
reg_mod = reg_model::type_id::create("reg_mod");
if(!reg_mod.randomize()) `uvm_error("REG_ACCESS_TEST", "Failed to randomize reg_mod");
endfunction
virtual function void run_phase(uvm_phase phase);
// 创建寄存器访问对象
uvm_reg_item rw;
uvm_reg_item read;
uvm_reg_item write;
// 初始化读取和写入事务
read = uvm_reg_item::type_id::create("read");
read.element = reg_mod;
read.path = "*";
read.kind = UVM_READ;
write = uvm_reg_item::type_id::create("write");
write.element = reg_mod;
write.path = "*";
write.kind = UVM_WRITE;
// 使用bit bash测试寄存器
uvm_reg_bit_bash bit_basher;
bit_basher.model = reg_mod;
bit_basher.read_transaction = read;
bit_basher.write_transaction = write;
bit_basher.setup();
bit_basher.set_num_cycles(1000);
bit_basher.run();
// 检查bit bash测试的结果
if(bit_basher.get_error_count() != 0) `uvm_error("REG_ACCESS_TEST", "Bit bash test failed");
endfunction
endclass
module top;
reg_access_test test;
initial begin
test = reg_access_test::type_id::create("test");
uvm_config_db#(virtual reg_model)::set(null, "*", "reg_model", test.reg_mod);
run_test();
end
endmodule
```
在这个例子中,我们首先定义了一个`reg_model`类,它包含两个寄存器字段`fld1`和`fld2`。然后我们定义了一个`reg_access_test`测试类,该类在`build_phase`中创建了一个`reg_model`对象,并在`run_phase`中使用UVM自带的`uvm_reg_bit_bash`测试对象来测试该寄存器的访问。最后,我们在顶层模块中实例化了`reg_access_test`对象,并使用`uvm_config_db`将`reg_model`对象传递给测试类。运行测试时,我们将使用UVM自带的`run_test()`函数来启动测试。