Data Quality
Overview
OptimalTest provides two data formats which complement each other to provide remarkable data quality and integrity. The combination of these formats with the tools available in OT-Portal enables you to reconcile yield and throughput numbers reported by subcons with the data log information reported by the tester.
New in 5.0: In addition to OTDF and OTWF files, OptimalTest servers at each test house generate "manifest" files which are sent periodically (e.g. once an hour) to each customer. The manifest file contains a list of all files currently in transit, or expected to be in transit in the near future. From the moment a lot starts testing, it is tracked and information about it is available in OT-Portal at the customer site. This capability exists even when testing is outsourced to a subcon.
OTDF [read more]
OTDF stands for OptimalTest Datalog Format. It is an XML-based datalogging format usually generated by OT-Proxy Server. OTDF has several advantages over older data formats:
- File size: Compressed OTDF files are typically around 30% the size of the equivalent compressed STDF file.
- Detailed touchdown data: In addition to detailed test results, OTDF contains the touchdown timestamp. This enables much better analysis of test time than is usually possible.
- Adaptive Test feedback: When adaptive test algorithms are being used, OTDF contains detailed information about calculations made by the algorithm and actions that were taken as a result.
- Data log consistency: Files generated for different tester platforms will be identical in format and content. They will contain the same type and style of data in all fields, no matter what format of file the tester originally produced. For example, naming conventions are matched for products, operations, lots, etc.
OTWF [read more]
OTWF is the OptimalTest Workflow Format. It is a concise XML format used to collect workflow data about lots tested in wafer sort (New in 5.0) and final test operations. OTWF contains information such as:
- Quantity of parts tested (Qty In)
- Total number of good parts
- Total number of bad parts
- Total number of good parts after the first test pass
- Total number of bad parts after the first test pass
- Bin distributions for first pass and after retest
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Benefits
Data quality is the cornerstone on which the entire OptimalEnterprise platform is built. All of the advanced analysis, simulation and adaptive test capabilities of the platform depend on the quality of the data in the database.
Achieving High Quality Data [read more]
OptimalTest works hand-in-hand with customers to ensure that OTDF and OTWF provide highest quality data. This is achieved by utilizing various data cleansing and augmentation capabilities provided by the OptimalEnterprise platform. These include automatic aliasing algorithms, mapping files and custom mapping code.
Reconciliation [read more]
OTDF and OTWF files are collected from subcons and loaded into the OptimalEnterprise database. OT-Portal can display information from either or both of these files and users can immediate identify and act on discrepancies between the two sources in order to ensure highest data quality.
