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Application to Consolidate Common Electronic Card Test Fixturing Tasks

IP.com Disclosure Number: IPCOM000106361D
Original Publication Date: 1993-Oct-01
Included in the Prior Art Database: 2005-Mar-21
Document File: 2 page(s) / 104K

Publishing Venue

IBM

Related People

Bulson, LG: AUTHOR [+3]

Abstract

Described is a method for taking advantage of the common aspects of electronic circuit card physical data to consolidate tasks associated with test fixture development, build, and maintenance. Card physical data may come from various design systems and resultant fixturing data may be formatted for specific vendors and card testers, but the fixturing tasks are independent of those considerations.

This text was extracted from an ASCII text file.
This is the abbreviated version, containing approximately 52% of the total text.

Application to Consolidate Common Electronic Card Test Fixturing Tasks

      Described is a method for taking advantage of the common
aspects of electronic circuit card physical data to consolidate tasks
associated with test fixture development, build, and maintenance.
Card physical data may come from various design systems and resultant
fixturing data may be formatted for specific vendors and card
testers, but the fixturing tasks are independent of those
considerations.

      This article addresses three aspects -- design data extraction
into a common binary table format, common fixturing applications
based on the binary tables, and data formatting to output the data in
the binary tables per format specifications.

Data Extraction - Although syntax varies by design system, the
structure of the physical data is basically the same.  Briefly, this
structure is: electrically common points on a card are grouped into
nets.  Each endpoint on a net is called a node.  Nodes have x and y
locations on the card and are associated with component pins,
connectors, or vias.

      The physical data is stored in a set of binary tables.  The net
table contains all the netnames, the number of nodes per net, and
indices to net groups within the node table.  The node table contains
a list of all the nodes on a card, grouped by net, and associated
nodal information such as x and y locations, probe and wiring
information, and indices to cross-reference the net and component
tables.  The component table stores information about all the
component locations, part numbers, and device types, i.e. SMT, PTH,
etc.  Finally, the card table contains overall information about the
electronic card--design system, units of measure, overall size, part
number, engineering change, etc.

      Design-system specific programs may be written to put the
required information directly into the binary table format.  Or,
design data may be formatted into a defined set of three to five
ASCII files which can then be converted by this system into the
binary table format.  The ASCII file option is useful for manual
designs and seldom-used design systems, since they can be manually
created with any editor.  Also, the ASCII files consist of, at least,
a net list, node list, and component list, which most design systems
will produce.  The format may then be modified w...