1 之前的方式要测试不同的sequence，必须要修改default_sequence，重新编译后才能运行。
2 my_case0 如下：
`ifndef MY_CASE0__SV
`define MY_CASE0__SV
class case0_sequence extends uvm_sequence #(my_transaction);
my_transaction m_trans;
function new(string name= "case0_sequence");
super.new(name);
endfunction
virtual task body();
if(starting_phase != null)
starting_phase.raise_objection(this);
repeat (10) begin
`uvm_do(m_trans)
end
#100;
if(starting_phase != null)
starting_phase.drop_objection(this);
endtask
`uvm_object_utils(case0_sequence)
endclass
class my_case0 extends base_test;
function new(string name = "my_case0", uvm_component parent = null);
super.new(name,parent);
endfunction
extern virtual function void build_phase(uvm_phase phase);
`uvm_component_utils(my_case0)
endclass
function void my_case0::build_phase(uvm_phase phase);
super.build_phase(phase);
uvm_config_db#(uvm_object_wrapper)::set(this,
"env.i_agt.sqr.main_phase",
"default_sequence",
case0_sequence::type_id::get());
endfunction
`endif
3.my_case1如下：
`ifndef MY_CASE1__SV
`define MY_CASE1__SV
class case1_sequence extends uvm_sequence #(my_transaction);
my_transaction m_trans;
function new(string name= "case1_sequence");
super.new(name);
endfunction
virtual task body();
if(starting_phase != null)
starting_phase.raise_objection(this);
repeat (10) begin
`uvm_do_with(m_trans, { m_trans.pload.size() == 60;})
end
#100;
if(starting_phase != null)
starting_phase.drop_objection(this);
endtask
`uvm_object_utils(case1_sequence)
endclass
class my_case1 extends base_test;
function new(string name = "my_case1", uvm_component parent = null);
super.new(name,parent);
endfunction
extern virtual function void build_phase(uvm_phase phase);
`uvm_component_utils(my_case1)
endclass
function void my_case1::build_phase(uvm_phase phase);
super.build_phase(phase);
uvm_config_db#(uvm_object_wrapper)::set(this,
"env.i_agt.sqr.main_phase",
"default_sequence",
case1_sequence::type_id::get());
endfunction
`endif
1）uvm_do_with 宏是uvm_do 系列宏的一个，用于在随机时约束某些字段的约束。
2）不同的case就是：1）要有不同的sequence 约束，设置到default_sequence。2）不同的参数配置。
4.top_tb 如下：
initial begin
run_test();
end
UVM从命令行寻找 +UVM_TESTNAME=xxxx(my_case1) 寻找测试用例名字。
5.整个启动及执行的流程图如下：
