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Comparescan User Guide

1
Introducing Comparescan . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	. 7
Features . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	. 8
Applications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	8
Organization of this Guide . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	9
2
Getting Started . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	10
Starting Comparescan . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	11
Specifying Input Files . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	12
Specifying Simulation Results Databases for Comparison . . . . . . . . . . . . . . . . . . . .	12
Specifying a Comparescan Rules File . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	13
Specifying a Comparescan Error Database for Viewing . . . . . . . . . . . . . . . . . . . . . .	14
Using Automatically Generated Files . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	14
Using the State File . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	15
Using the Preferences File . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	15
Using X Resources . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	15
Understanding Comparescan Exit Status Codes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	16
3
Comparescan Tutorial . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	17
Accessing the Tutorial Source Files . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	18
Simulation Results Databases . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	18
Comparescan Rules Files . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	18
Generating a Comparescan Error Database . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	18
Viewing a Comparescan Error Database . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	19
Viewing Errors in Hierarchical Order . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	21
Viewing Errors in Signalscan Waves . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	23
Viewing Multiple Objects in Signalscan Waves . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	26
Viewing Errors in Time Order . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	29

December 2000

Product Version 1.9

Comparescan User Guide

Exiting Comparescan . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	31
Giving More Information in the Rules File . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	31
Reviewing the demo.rules Rules File . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	31
Using the demo.rules Rules File . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	32
Viewing Clocked Miscompares in Signalscan Waves . . . . . . . . . . . . . . . . . . . . . . . . .	34

4
Comparescan Graphical User Interface . . . . . . . . . . . . . . . . . . . . . . .	36
Comparescan Window . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	37
Menu Bar . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	38
File Menu . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	38
Tools Menu . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	39
View Menu . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	42
Window Menu . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	43
Button Bar . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	44
5
Application Examples . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	46
Making Absolute Comparisons . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	47
Specifying the Filename of an Object . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	47
Comparing Two Objects from the Same File . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	48
Comparing Two Objects on a Condition . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	48
Creating Clock Deﬁnitions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	48
Making Clocked Comparisons . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	49
Using One Clock and Two Simulation Files . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	49
Using One Clock and One Simulation File . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	49
Using Two Clocks and Two Simulation Files . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	50
Using Two Clocks and One Simulation File . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	50
Performing a Clock Compare with Timing Checks . . . . . . . . . . . . . . . . . . . . . . . . . . .	50
Checking Stability . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	51
Specifying Objects in the Design Hierarchy . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	51
Command Option Examples . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	52
Specifying Start and End Times for Golden and Test Files . . . . . . . . . . . . . . . . . . . .	52
Specifying Start and End Times for Comparison . . . . . . . . . . . . . . . . . . . . . . . . . . . .	52
Specifying a Time Shift . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	52

December 2000

Product Version 1.9

Comparescan User Guide

Specifying compare Command Tolerance Windows . . . . . . . . . . . . . . . . . . . . . . . . .	52
Special Syntax Examples . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	53
Commenting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	53
Continuing Long Lines . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	53
Specifying Both a Golden and a Test File . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	53
Specifying Filenames Using UNIX Filename Syntax . . . . . . . . . . . . . . . . . . . . . . . . .	53
Options Can Be Speciﬁed in Any Order . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	54

6
Writing Comparescan Rules . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	55
Default Comparison Rules . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	56
Absolute and Clocked Comparisons . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	56
Rules File Parsing and Execution . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	57
Command Syntax and Options . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	58
General Command Syntax . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	58
Command Summary . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	59
General Command Options . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	61
dataﬁle1 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	65
dataﬁle2 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	66
compare . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	67
clkdef . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	77
clkcompare . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	78
stability . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	84
sequencetime . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	85
nosequencetime . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	85
statemapping . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	86
threshold . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	89
report . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	91
savedata . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	92
loaddata . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	93
translate . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	94

December 2000

Product Version 1.9

Comparescan User Guide
A
Frequently Asked Questions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	. 97
Comparescan Input . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	98
Can I compare VCD ﬁles? . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	98
Is it better to use SST2 ﬁles in Comparescan? . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	98
Can I translate a VCD ﬁle to an SST2 database ﬁle? . . . . . . . . . . . . . . . . . . . . . . . .	98
Can I compare a VCD ﬁle with a ﬁle in some other format? . . . . . . . . . . . . . . . . . . . .	98
Comparescan Output . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	98
How do I view a comparison report that I have generated? . . . . . . . . . . . . . . . . . . . .	98
Can I print a report of my errors? . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	99
Can I run the tool in batch mode? . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	99
Graphical User Interface (GUI) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	99
How do I run the program without the user interface? . . . . . . . . . . . . . . . . . . . . . . . .	99
Why can’t Comparescan allocate colors? . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	99
How do I change the colors in the GUI? . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	100
Why can’t I read the text in the GUI? . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	100
I just changed my .Xdefaults ﬁle. Why has nothing happened? . . . . . . . . . . . . . . . .	100
Comparescan Features . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	101
How can I compare a digital simulation with an analog simulation? . . . . . . . . . . . . .	101
How do I match an X value? . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	101
How do I compare only the top-level signals in my design? . . . . . . . . . . . . . . . . . . .	101
How do I compare modules at different levels in the hierarchy? . . . . . . . . . . . . . . .	101
What if I want a different tolerance window for every signal? . . . . . . . . . . . . . . . . . .	101
I speciﬁed times in the rules ﬁle. What are the default units? . . . . . . . . . . . . . . . . . .	102
Comparescan Error Messages . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	102
What does “Out of Memory” mean? . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	102
What does “fork failed” mean? . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	102
How do I ﬁnd out how big my processes are? . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	103
How do I ﬁnd out how much memory my machine has? . . . . . . . . . . . . . . . . . . . . .	103
Index..............................................................................................................................	104

December 2000

Product Version 1.9

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Contents