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What type of compression technology does Bantam GDSII Stream Optimization use?
Bantam does not use compression technologies of any kind. Bantam is optimization. Bantam output files are GDSII Stream version 6 files
Bantam is not compression.
Bantam is optimization.
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How do I "undo" Bantam in order to read the design into a tool?
There is no need to "undo" Bantam optimization. Bantam output files are GDSII Stream and 100%
point-for-point equivalent to the input file. Any tool that reads GDSII Stream version 6 will be able to read a Bantam output file.
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I prefer to keep my GDSII Stream files compressed. Can I use compression with files optimized by Bantam?
Yes, you may compress Bantam optimized GDSII Stream files. Bantam users report that gzip compressed Bantam optimized files are, on average, 10X smaller compared to gzip compression alone.
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I'm worried that Bantam will create an error in my design. What steps has Saratoga Data Systems taken to assure the accuracy of Bantam 1.8?
Saratoga Data Systems maintains a test suite of more than 100 GDSII Stream files on which it rigorously tests Bantam for accuracy. Bantam is not released unless it successfully passes all tests.
Bantam 1.8 endured a rigorous three month customer beta test period in which its accuracy was tested on hundreds more full chip GDSII Stream design files of up to 68GB in size. Bantam's accuracy was verified using the exclusive-or (XOR) function of several popular physical verification products.
The production version of Bantam has never created an error.
Bantam strictly adheres to the GDSII Stream version 6 specification.
And finally, Bantam 1.8 uses a 96 bit internal checksum to verify that each optimized structure written to the output GDSII Stream file is equivalent to the structure read from the input GDSII Stream file.
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How effective is a checksum in insuring the equivalency of my GDSII Stream data?
Checksums are a widely used and accepted method of validating data. Most data transmission protocols use checksums for error detection.
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Can you assure me that future versions of Bantam will maintain a high level of quality?
In addition to the more than 100 GDSII Stream files in their test suite, Saratoga Data System, Inc. maintains a Customer Acceptance Test suite. Saratoga Data Systems, Inc. accepts your GDSII Stream files for inclusion in the Customer Acceptance Test suite and assures you that Bantam accurately runs your GDSII Stream files before it is released.
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Does Bantam change the fundamental shape representation of my data? For example, does Bantam change polygons into paths or boxes to save space?
No, Bantam never changes the fundamental shape representation of your data. Polygons remain polygons, paths remain paths, and boxes remain boxes.
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What is the capacity of Bantam 1.8? How large of a GDSII Stream file can Bantam 1.8 optimize?
Bantam 1.8 routinely and accurately optimizes GDSII Stream files of tens of gigabytes in size. Bantam 1.8 accurately optimized an 87GB file. Bantam has never encountered a file too large for it to optimize.
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Can Bantam 1.8 effectively optimize optically corrected (OPC) and phase shifted mask (PSM) designs?
Yes. In fact, Bantam 1.8 excels at optimizing GDSII Stream files that are optically corrected or use phase shifted mask technologies. Bantam 1.8 typically reduces the size of OPC or PSM design files by 75% or more. Bantam 1.8 has reduced many OPC and PSM design files by 95%.
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Why does Bantam run slower on my Solaris computer than my Linux computer?
Bantam's performance is primarily dependent upon the integer performance of the computer on which it is run. Most likely your Linux computer has higher integer performance then your Solaris computer.
Integer performance is measured in units called SPECint. A listing of SPECint ratings for most popular computer systems can be found at: http://www.spec.org/cpu2000/results/cint2000.html
If you use this page to compare the integer performance of your Solaris computer with your Linux computer, you will likely find that the ratio of their SPECint ratings correlates to ratio of the performance of Bantam on the two computers. For example, if Bantam runs five times faster on your Linux machine than your Solaris machine, you will find that the SPECint rating of the Linux computer is likely to be about five times the SPECint rating of the Solaris computer.
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What type of computer system does Bantam 1.8 require?
Bantam 1.8 runs on Linux x86 and Solaris SPARC 2 computer systems.
Bantam 1.8 is tuned to run on "server" class computers and some "power user desktop" computers: at least 1GB of RAM, 2GB of virtual memory. A SPECint rating of 1000 or greater is highly desirable.
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How fast does Bantam optimize GDSII Stream data?
Bantam 1.8 typically optimizes 1GB of GDSII Stream data in three minutes or less when run on a computer meeting the requirements above.
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