日常記錄（68）常規-40
阿新 • • 發佈：2022-03-03
urandom_range
- 只有一個引數，是從0到該引數的範圍。
- 有兩個引數，大小無所謂，但是範圍是二者之間幷包括二者。
module taa ();
initial begin
for (int i = 0; i < 100; i++) begin
#1;
$display("random value:", $urandom_range(1));
end
end
endmodule
冗餘度控制
外部配置的+UVM_VERBOSITY如果更高，但是內部控制的冗餘度更低，那麼最終顯示是更低的效果。
set_report_verbosity_level
控制當前的冗餘度，字尾hier表示一個向下繼承。
set_report_id_verbosity
字尾的level去掉，然後report變為report_id，這樣控制當前元件的某一個id的顯示冗餘度，能夠跨越對整個冗餘度。
字尾hier表示向下繼承。
+UVM_VERBOSITY=NONE
其中NONE是UVM_NONE,這裡的UVM_可以省去。
uvm_object的冗餘度
內部沒有設定冗餘度函式函式，使用上層繼承。
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
輸出結果：
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的回撥
pre_randomize、post_randomize
回撥函式，randomize前後自動執行。
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
輸出結果：
點選檢視程式碼
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測試
pack、unpack、print、compare
pack過程中，使用pack_bytes函式，傳入的動態陣列，打包得到的4個byte資料在que中，然後通過%p、顯示了一下。
unpack_bytes函式，傳入了一個佇列，然後將資料恢復到了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
輸出結果：
-----------------------------
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通訊
combine\comm_test\comm_send
- combine進行了一些連線，
- cs通過write廣播資料。而ct接收資料的時候，使用廣播接收資料，同時使用阻塞接收資料
- 阻塞接收資料使用uvm_tlm_analysis_fifo的形式。
連線通路
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
輸出結果：
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
Le vent se lève! . . . il faut tenter de vivre!
Le vent se lève! . . . il faut tenter de vivre!