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Data Analysis tool by EBA
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04/12/20232
Contents
CONFIDENTIAL
•What is STDF•What is STDF_PRJ tool•Tool’s Main Features•Benchmark
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What is STDF
CONFIDENTIAL
The Standard Test Data Format is a comprehensive standard for the entire ATE industry, developed by Teradyne.
STDF is flexible enough to meet the needsof the different testers that generate raw test data coming from ATE.
Data analysis programs use STDF ( binary file ) to extract desired information.
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What is Standard Test Data Yield Analysis
CONFIDENTIAL
Standard Test Data Yield Analysis tool enables test and product engineers to perform fast Yield analysis and process characterization on their desktops, using standard semiconductor test data files STDF.
Tool is particularly useful for test engineers, close to ATE system. It dose not require a Data Base and DataPower to identify and report yield issues.
ATE generates STDF file, tool opens it and analyses the results, no need to wait for data to be inserted into Data Base and later appear in DataPower.
Tool was developed over a year out of office hours to enable me to do my job better and faster. Softwares used to develop it are Windows Pascal, Advance_Grid and TeeChart_Pro.
Start up Window
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Tool’s Main Features
CONFIDENTIAL
Distribution Plots:Contains main Stat Data
Box Plots: useful for process characterization & Matrix Lots Analysis
Parametric test wafer map: analyze the test gradient on wafer to investigate process or testing related problems
Pareto Fails Charts:
Color gradients on the distributionPlot corresponds to gradient On the wafer for a given parameter..
Tools can read multiple STDF files
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Tool’s Main Features cont…
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1 2 3 4 5 6 7
1 Contains Raw data.
2 Soft Ware Bin Fails• Stores a count of the parts associated with a particular logical bin after
testing.
3 Hard ware Bin Fails• Stores a count of the parts “physically” placed in a particular bin after
testing.
4 Test Synopsis Data : • Contains the test execution and failure counts for parametric or
functional tests.
5 Detailed Global information: tester, lot, operator etc…
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Tool’s Main Features cont…
Test summary:
Test name, limits, Fail count, Min, Max, Range, Mean, Sigma, Cpk, etc.. Copy and paste for reporting…
6
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Tool’s Main Features cont…
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Detailed Global information: tester, lot, operator information,Copy and paste for reporting
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Tool’s Main Features cont…
CONFIDENTIAL
Raw Data view
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Tool’s Main Features cont…
CONFIDENTIAL
Yield information : good parts, failing parts, parts retested, Copy and paste for reporting
A mouse click on YLD% or FAIL_CN cells sorts the data, useful to see main parameters causing a yield loss.
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Tool’s Main Features cont…
CONFIDENTIAL
Software Bin Fails, text or graphical format, Copy and paste for reporting
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Benchmark
CONFIDENTIAL
STDF TOOL Data Power
Does Data is avaiable immediatley after a Lot is completed? Yes
NO, Data to be inserted into DATA BASE later picked up
by Datapower
Does it require Data Base to access Data ? NO Yes
Pareto Fails Available after extraction Time ? Yes NO *
Yield Data Available after extraction Time ? Yes NO *
Wafer Maps Available after extraction Time ? Yes NO *
Distribution Plots Available after extraction Time ? Yes NO *
* After Data extraction It requires extra steps and time to filter data
