写一个SHA256 UVM的测试平台
首先,需要安装UVM库和SHA256模块库,并设置环境变量。
接下来,我们需要编写一个测试平台,该平台需要包含以下组件:
- SHA256测试生成器(test sequence generator)
- SHA256测试驱动(test driver)
- SHA256测试监视器(test monitor)
- SHA256测试代理(test agent)
- SHA256测试环境(test environment)
以下是一个SHA256 UVM测试平台的示例代码:
`include "uvm_macros.svh"
module sha256_test;
// Import the necessary packages
import uvm_pkg::*;
import sha256_pkg::*;
// Declare the test environment
sha256_env env;
// Declare the test sequence generator
sha256_test_seq_gen seq_gen;
// Declare the test driver
sha256_test_driver driver;
// Declare the test monitor
sha256_test_monitor monitor;
// Declare the test agent
sha256_test_agent agent;
// Instantiate the test sequence generator
initial begin
seq_gen = sha256_test_seq_gen::type_id::create("seq_gen");
end
// Instantiate the test driver
initial begin
driver = sha256_test_driver::type_id::create("driver");
end
// Instantiate the test monitor
initial begin
monitor = sha256_test_monitor::type_id::create("monitor");
end
// Instantiate the test agent
initial begin
agent = sha256_test_agent::type_id::create("agent");
end
// Instantiate the test environment
initial begin
env = sha256_env::type_id::create("env");
env.seq_gen = seq_gen;
env.driver = driver;
env.monitor = monitor;
env.agent = agent;
end
// Start the test
initial begin
run_test("sha256_test");
end
endmodule
该平台包含了一个test sequence generator、test driver、test monitor、test agent和test environment。我们需要在test sequence generator中编写测试用例,然后通过test driver将测试用例发送到DUT,test monitor监听DUT的输出,并将结果发送到test agent,test agent负责管理DUT的输入和输出。
SHA256测试用例可以在test sequence generator中编写,以下是一个示例代码:
class sha256_test_seq extends uvm_sequence#(sha256_test_case);
`uvm_object_utils(sha256_test_seq)
// Declare the test case
sha256_test_case tc;
// Constructor
function new(string name = "sha256_test_seq");
super.new(name);
endfunction
// Main sequence body
virtual task body();
// Create a new test case
tc = sha256_test_case::type_id::create("tc");
// Set the input data
tc.data = "Hello, World!";
// Set the expected hash value
tc.hash = "cbb1ccb1e3c192ee3a8b5a8b8c2c939d0a8a2d03a6ce6d3b1d0c8a3d3a8e6a3";
// Send the test case to the test driver
seq_item_port.put(tc);
// Wait for the test case to complete
@(tc.done);
// Print the test case results
`uvm_info(get_type_name(), $sformatf("Test case %0d: %s", tc.get_inst_id(), tc.result), UVM_MEDIUM)
endtask
endclass
在test driver中,我们需要将测试用例转换为DUT可以理解的格式,并将其发送到DUT模块。以下是一个示例代码:
class sha256_test_driver extends uvm_driver#(sha256_test_case);
`uvm_component_utils(sha256_test_driver)
// Constructor
function new(string name = "sha256_test_driver", uvm_component parent = null);
super.new(name, parent);
endfunction
// Drive a test case
virtual task run_phase(uvm_phase phase);
sha256_test_case tc;
// Wait for a test case to arrive
forever begin
seq_item_port.get_next_item(tc);
// Drive the input data into the DUT
// ...
// Wait for the DUT to produce the output data
// ...
// Send the output data to the monitor
item_done_port.write(tc);
// Notify the test case that it is complete
tc.done.set();
end
endtask
endclass
在test monitor中,我们需要监听DUT的输出,并将其转换为UVM格式发送到test agent。以下是一个示例代码:
class sha256_test_monitor extends uvm_monitor;
`uvm_component_utils(sha256_test_monitor)
// Declare the analysis port
uvm_analysis_port#(sha256_test_case) item_analysis_port;
// Constructor
function new(string name = "sha256_test_monitor", uvm_component parent = null);
super.new(name, parent);
item_analysis_port = new("item_analysis_port", this);
endfunction
// Monitor the DUT
virtual task run_phase(uvm_phase phase);
sha256_test_case tc;
// Wait for output data from the DUT
forever begin
// Wait for the DUT to produce the output data
// ...
// Convert the output data to UVM format
tc = sha256_test_case::type_id::create("tc");
tc.data = "Hello, World!";
tc.hash = "cbb1ccb1e3c192ee3a8b5a8b8c2c939d0a8a2d03a6ce6d3b1d0c8a3d3a8e6a3";
tc.result = "PASS";
// Send the output data to the test agent
item_analysis_port.write(tc);
end
endtask
endclass
在test agent中,我们需要管理DUT的输入和输出,并将结果发送到test environment。以下是一个示例代码:
class sha256_test_agent extends uvm_agent;
`uvm_component_utils(sha256_test_agent)
// Declare the analysis port
uvm_analysis_port#(sha256_test_case) item_analysis_port;
// Declare the input and output ports
sha256_input_port input_port;
sha256_output_port output_port;
// Constructor
function new(string name = "sha256_test_agent", uvm_component parent = null);
super.new(name, parent);
item_analysis_port = new("item_analysis_port", this);
input_port = new("input_port", this);
output_port = new("output_port", this);
endfunction
// Connect the agent to the DUT
virtual function void build_phase(uvm_phase phase);
super.build_phase(phase);
input_port.connect(output_port);
endfunction
// Process output data from the DUT
virtual task run_phase(uvm_phase phase);
sha256_test_case tc;
// Wait for output data from the monitor
forever begin
item_analysis_port.get_next_item(tc);
// Compare the output data to the expected value
if (tc.hash != tc.result) begin
tc.result = "FAIL";
end
// Send the test case results to the test environment
result_port.write(tc);
end
endtask
endclass
最后,我们需要编写一个SHA256测试环境,该环境包含了一个test sequence generator、test driver、test monitor、test agent。以下是一个示例代码:
class sha256_env extends uvm_env;
`uvm_component_utils(sha256_env)
// Declare the test sequence generator, test driver, test monitor, and test agent
sha256_test_seq_gen seq_gen;
sha256_test_driver driver;
sha256_test_monitor monitor;
sha256_test_agent agent;
// Constructor
function new(string name = "sha256_env", uvm_component parent = null);
super.new(name, parent);
endfunction
// Build the environment
virtual function void build_phase(uvm_phase phase);
super.build_phase(phase);
// Create the test sequence generator
seq_gen = sha256_test_seq_gen::type_id::create("seq_gen", this);
// Create the test driver
driver = sha256_test_driver::type_id::create("driver", this);
// Create the test monitor
monitor = sha256_test_monitor::type_id::create("monitor", this);
// Create the test agent
agent = sha256_test_agent::type_id::create("agent", this);
// Connect the components
seq_gen.item_port.connect(driver.seq_item_port);
driver.item_done_port.connect(monitor.item_analysis_port);
monitor.item_analysis_port.connect(agent.item_analysis_port);
agent.result_port.connect(this.result_port);
endfunction
endclass
该环境包含了一个test sequence generator、test driver、test monitor、test agent,并且将它们连接起来。最后,在顶层模块中,我们需要实例化该环境并启动测试。以下是一个示例代码:
module top;
// Include the UVM library
`include "uvm_macros.svh"
// Import the necessary packages
import uvm_pkg::*;
import sha256_pkg::*;
// Declare the SHA256 test
sha256_test test;
// Instantiate the SHA256 test
initial begin
// Create a new SHA256 test
test = sha256_test::type_id::create("test");
// Set the test configuration
uvm_config_db#(string)::set(null, "test.*", "config", "default");
// Start the test
test.start();
end
endmodule
该顶层模块实例化了SHA256测试,并启动了测试。测试开始后,test sequence generator将生成测试用例,test driver将将测试用例发送到DUT,test monitor将监听DUT的输出,并将结果发送到test agent,test agent将管理DUT的输入和输出,并将结果发送到test environment。最后,test environment将通过result_port将结果发送到顶层模块。