[Tool] Verdi 用法（dump waveform）

1.1 Basic Usage(add in top module)

• Specifying fsdb file : $fsdbDumpfile(file_name,file_size(MB))
• Dumping fsdb information : $fsdbDumpvars(depth, instance, options)
• Depth :
  • 0 : all signals in all scopes.
  • 1 : all signals in current scope.
  • 2 : all signals in the current scope and all scopes one level below.
  • n : all signals in the current scope and all scopes n-1 levels below.
• Options (Optional) :

Options	Description
+all	Dump all signals including memory, MDA, packed array, structure, union, power-related, and packed structure
+mda	Dump all memory and MDA signals
+strength	Enable strength dumping
+struct	Dump all structs (default on)
+power	Dump power-related signals (default on)
others	check on verdi -doc //$VERDI_HOME/doc/linking_dumping.pdf

• vcs compile option : -debug_pp is needed
  • Recommend : VCS and Verdi should align at least same version

$fsdbDumpfile("test.fsdb",50)
$fsdbDumpvars(0, chip_top,"+power","+struct", "+mda");

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1.2 Q: How to split fsdb file?

• Split by FSDB Size
  • $fsdbAutoSwitchDumpfile(File_size(MB), File_name, number_of_file)
  • Recommend File Size: RTL not over 2G, netlist not over 5G:

initial begin
    $fsdbDumpvars(0, dut);
    $fsdbAutoSwitchDumpfile(2000, XXX, 20);
en

• Split by Time Period

integer i;
initial begin
    $fsdbDumpvars(0, dut);
    i=0;
    forever begin
        $fsdbSwitchDumpfile($sformatf("XXX_%0d", i));
        #time period;
        i = i+1;
    end
end

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1.3 Q: How to dump a certain time interval only?

• Use $fsdbDumpon, $fsdbDumpoff to specify time interval

initial begin
    $fsdbDumpvars(0, dut, "+fsdbfile+interval.fsdb");
    #40 $fsdbDumpoff;
    #40 $fsdbDumpon;
    #40 $fsdbDumpoff;
    #40 $finish;
end

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1.4 Q: How to not dump a certain instance?

• Use $fsdbSupress(instance) to specify certain instance
• NOTE : $fsdbSuppress must be specified before $fsdbDumpvars

initial begin
    $fsdbSuppress(dut.inst_a, dut.inst_b);
    $fsdbDumpvars(0, dut);
end

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1.5 Q: How to dump assertion?

• Use $fsdbDumpSVA(depth, instance)
• vcs compile option : -sverilog -debug_pp is needed
• NOTE: After Verdi 1703SP1-1, please add runtime option "+fsdb+sva_success"

initial begin
    $fsdbDumpSVA(0, dut);
end

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1.6 Q: How to dump memory arrays?

• Use $fsdbDumpMDA(depth, instance)
• vcs compile option : -debug_pp, +memcbk  is needed

initial begin
    $fsdbDumpMDA(1, dut.i_pram);
end

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1.7 Q: How to dump lib cells signal to fsdb?

• vcs compile option : -debug_acc -debug_region=cell+lib is needed

Example: vcs -debug_acc -debug_region=cell+lib 

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1.8 Q: How to dump glitch information?

• By simulation command
  • Before Verdi/1509, simv +fsdb+sequential +fsdb+glitch=0 +fsdb+region
  • After Verdi/1509, simv +fsdb+delta

%> simv +fsdb+sequential +fsdb+glitch=0 +fsdb+region

• By Environment variable

%> setenv NOVAS_FSDB_ENV_DUMP_SEQ_NUM 1
%> setenv NOVAS_FSDB_ENV_MAX_GLITCH_NUM 0
%> setenv FSDB_REGION
then re-run simulation

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1.9 Q: How to dump force information?

• By simulation command
  • simv +fsdb+force

%> simv +fsdb+force

• By Environment variable

%> setenv FSDB_FORCE
then re-run simulation