日常记录（68）常规-40
作者：互联网
urandom_range
- 只有一个参数，是从0到该参数的范围。
- 有两个参数，大小无所谓，但是范围是二者之间并包括二者。
module taa ();
initial begin
for (int i = 0; i < 100; i++) begin
#1;
$display("random value:", $urandom_range(1));
end
end
endmodule
冗余度控制
外部配置的+UVM_VERBOSITY如果更高，但是内部控制的冗余度更低，那么最终显示是更低的效果。
set_report_verbosity_level
控制当前的冗余度，后缀hier表示一个向下继承。
set_report_id_verbosity
后缀的level去掉，然后report变为report_id，这样控制当前组件的某一个id的显示冗余度，能够跨越对整个冗余度。
后缀hier表示向下继承。
+UVM_VERBOSITY=NONE
其中NONE是UVM_NONE,这里的UVM_可以省去。
uvm_object的冗余度
内部没有设置冗余度函数函数，使用上层继承。
module tbb ();
import uvm_pkg::*;
class info_obj extends uvm_object;
task run_phase(uvm_phase phase);
`uvm_info("INFO_ID1", "UVM_HIGH", UVM_HIGH);
`uvm_info("INFO_ID2", "UVM_MEDIUM", UVM_MEDIUM);
`uvm_info("INFO_ID3", "UVM_LOW", UVM_LOW);
`uvm_info("INFO_ID4", "UVM_NONE", UVM_NONE);
`uvm_warning("INFO_ID5", "WARNING");
endtask: run_phase
endclass : info_obj
class info_comp extends uvm_component;
// data or class properties
function new(string name="info_comp", uvm_component parent);
super.new(name, parent);
endfunction: new
task run_phase(uvm_phase phase);
`uvm_info("INFO_ID1", "UVM_HIGH", UVM_HIGH);
`uvm_info("INFO_ID2", "UVM_MEDIUM", UVM_MEDIUM);
`uvm_info("INFO_ID3", "UVM_LOW", UVM_LOW);
`uvm_info("INFO_ID4", "UVM_NONE", UVM_NONE);
`uvm_warning("INFO_ID5", "WARNING");
endtask: run_phase
function void set_level();
set_report_id_verbosity("INFO_ID3", UVM_NONE);
endfunction: set_level
endclass : info_comp
initial begin
info_obj obj = new();
info_comp comp = new("info_comp", null);
/* uvm_top.set_report_verbosity_level_hier(UVM_NONE); */
/* uvm_top.set_report_id_verbosity_hier("INFO_ID3", UVM_NONE); */
uvm_top.set_report_id_verbosity_hier("INFO_ID3", UVM_NONE);
obj.run_phase(null);
comp.set_level();
comp.run_phase(null);
end
endmodule
输出结果：
UVM_INFO tbb.sv(7) @ 0: reporter [INFO_ID2] UVM_MEDIUM
UVM_INFO tbb.sv(9) @ 0: reporter [INFO_ID4] UVM_NONE
UVM_WARNING tbb.sv(10) @ 0: reporter [INFO_ID5] WARNING
UVM_INFO tbb.sv(23) @ 0: info_comp [INFO_ID2] UVM_MEDIUM
UVM_INFO tbb.sv(25) @ 0: info_comp [INFO_ID4] UVM_NONE
UVM_WARNING tbb.sv(26) @ 0: info_comp [INFO_ID5] WARNING
random的回调
pre_randomize、post_randomize
回调函数，randomize前后自动执行。
module tcc ();
class random_test;
// data or class properties
rand bit [3:0] sa;
randc bit [3:0] da;
function void pre_randomize();
$display("before random: %0b, %0b", sa, da);
endfunction: pre_randomize
function void post_randomize();
$display("after random: %0b, %0b", sa ,da);
endfunction: post_randomize
endclass : random_test
initial begin
random_test rt = new();
for (int i = 0; i < 10; i++) begin
rt.randomize();
#1;
end
$display("the end.");
end
endmodule
输出结果：
点击查看代码
before random: 0, 0
after random: 11, 101
before random: 11, 101
after random: 110, 1
before random: 110, 1
after random: 1, 10
before random: 1, 10
after random: 1001, 11
before random: 1001, 11
after random: 1101, 100
before random: 1101, 100
after random: 111, 0
before random: 111, 0
after random: 0, 111
before random: 0, 111
after random: 10, 1001
before random: 10, 1001
after random: 1101, 110
before random: 1101, 110
after random: 1010, 1110
the end.
automation测试
pack、unpack、print、compare
pack过程中，使用pack_bytes函数，传入的动态数组，打包得到的4个byte数据在que中，然后通过%p、显示了一下。
unpack_bytes函数，传入了一个队列，然后将数据恢复到了pt2中了。
module tdd ();
import uvm_pkg::*;
class print_test extends uvm_object;
// data or class properties
int a;
`uvm_object_utils_begin(print_test)
`uvm_field_int(a, UVM_ALL_ON)
`uvm_object_utils_end
// initialization
function new(string name="print_test");
super.new(name);
a = 1;
endfunction : new
endclass : print_test
initial begin
print_test pt = new ("pt");
print_test pt2 = new ("pt2");
byte unsigned que[];
uvm_active_passive_enum is_active;
pt.print();
pt2.a = 1;
$display("value compare ans: %d", pt.compare(pt2));
pt.a = 3;
$display("pack size : %d ", pt.pack_bytes(que));
$display("pack bytes : %p", que);
pt2.unpack_bytes(que);
$display("after unpack on pt2");
pt2.print();
/* pt.un */
$display("default value %s", UVM_ACTIVE);
$display("active value %d, %s", UVM_ACTIVE, UVM_ACTIVE);
end
endmodule
输出结果：
-----------------------------
Name Type Size Value
-----------------------------
pt print_test - @335
a integral 32 'h1
-----------------------------
value compare ans: 1
pack size : 32
pack bytes : '{'h0, 'h0, 'h0, 'h3}
after unpack on pt2
-----------------------------
Name Type Size Value
-----------------------------
pt2 print_test - @336
a integral 32 'h3
-----------------------------
default value UVM_ACTIVE
active value 1, UVM_ACTIVE
TLM通信
combine\comm_test\comm_send
- combine进行了一些连接，
- cs通过write广播数据。而ct接收数据的时候，使用广播接收数据，同时使用阻塞接收数据
- 阻塞接收数据使用uvm_tlm_analysis_fifo的形式。
连接通路
uvm_analysis_port - uvm_analysis_imp
uvm_analysis_port - uvm_tlm_analysis_fifo.analysis_export - uvm_tlm_analysis_fifo.blocking_get_export - uvm_blocking_get_port
使用方法
- function void write(int a);
- uvm_blocking_get_port.get(a);
module tee ();
import uvm_pkg::*;
class comm_test extends uvm_component;
// data or class properties
uvm_analysis_imp #(int, comm_test) ap;
uvm_tlm_analysis_fifo #(int) taf;
uvm_blocking_get_port #(int) bgp;
// initialization
function new(string name="comm_test", uvm_component parent);
super.new(name, parent);
ap = new("ap", this);
bgp = new("bgp", this);
taf = new("taf", this);
endfunction : new
function void connect_phase(uvm_phase phase);
super.connect_phase(phase);
/* bgp.connect(taf.blocking_get_export); */
/* taf.blocking_get_export.connect(bgi); */
endfunction: connect_phase
function void write(int a);
$display("get a value a %d", a);
endfunction: write
task run_phase(uvm_phase phase);
int a;
$display("before value a from fifo %d", a);
bgp.get(a);
$display("value a from fifo %d", a);
endtask: run_phase
endclass : comm_test
class comm_send extends uvm_component;
// data or class properties
uvm_analysis_port#(int) ap;
// initialization
function new(string name="comm_send", uvm_component parent);
super.new(name, parent);
ap = new("ap" , this);
endfunction : new
task run_phase(uvm_phase phase);
ap.write(1);
`uvm_info("SEND_FLAG", "SEND FINISHED.", UVM_LOW)
endtask: run_phase
endclass : comm_send
class combine extends uvm_test;
// data or class properties
`uvm_component_utils(combine)
comm_test ct;
comm_send cs;
// initialization
function new(string name="combine", uvm_component parent);
super.new(name, parent);
endfunction : new
function void build_phase(uvm_phase phase);
super.build_phase(phase);
ct=new("ct", this);
cs=new("cs", this);
endfunction: build_phase
function void connect_phase(uvm_phase phase);
super.connect_phase(phase);
cs.ap.connect(ct.ap);
cs.ap.connect(ct.taf.analysis_export);
ct.bgp.connect(ct.taf.blocking_get_export);
endfunction: connect_phase
endclass : combine
initial begin
run_test("combine");
end
endmodule
输出结果：
UVM_INFO @ 0: reporter [RNTST] Running test combine...
get a value a 1
UVM_INFO tee.sv(48) @ 0: uvm_test_top.cs [SEND_FLAG] SEND FINISHED.
before value a from fifo 0
value a from fifo 1
UVM_INFO /home/synopsys/vcs-mx/O-2018.09-1/etc/uvm-1.2/base/uvm_report_server.svh(894) @ 0: reporter [UVM/REPORT/SERVER]
--- UVM Report Summary ---
** Report counts by severity
UVM_INFO : 3
UVM_WARNING : 0
UVM_ERROR : 0
UVM_FATAL : 0
** Report counts by id
[RNTST] 1
[SEND_FLAG] 1
[UVM/RELNOTES] 1
$finish called from file "/home/synopsys/vcs-mx/O-2018.09-1/etc/uvm-1.2/base/uvm_root.svh", line 527.
$finish at simulation time 0
标签：INFO,40,random,常规,phase,UVM,68,new,uvm 来源： https://www.cnblogs.com/bai2022/p/15962044.html