Pluggable electronic card presence detect scheme for use in parallel and serial vital detect product data (VPD) collection systems
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United States of America Patent
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Sep 14, 1999
Grant Date -
N/A
app pub date -
Apr 11, 1997
filing date -
Apr 11, 1997
priority date (Note) -
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Abstract
A vital product data (VPD) detection circuit mountable on a substrate of a pluggable component. The circuit comprises a 'parallel read' circuit for generating vital product data associated with the pluggable component, a 'serial read' circuit for storing and retrieving vital product data associated with the pluggable component, and means for interconnecting the parallel and serial read circuits. The parallel read circuit preferably comprises a parallel array of transistors surface-mounted on the substrate, and the serial read circuit preferably comprises a serial EEPROM having a clock input, a set of address inputs, and a bidirectional data pin. A VPD detection mechanism may disable the parallel VPD circuitry in favor of the serial VPD detection circuitry, or vice versa, or these circuits may be enabled but activated in a mutually exclusive manner.
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