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Programmable logic system for filtering commands to a microprocessor

  • US 5,226,122 A
  • Filed: 08/21/1987
  • Issued: 07/06/1993
  • Est. Priority Date: 08/21/1987
  • Status: Expired due to Term
First Claim
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1. A method for filtering input commands to a controller accessed by a microprocessor, said controller producing system control signals in response to input commands from said microprocessor, comprising the steps of:

  • (a) monitoring signal lines connected to output terminals of said microprocessor, said signal lines communicating input commands from the microprocessor;

    (b) inhibiting said controller from generating a system control signal corresponding to a selected input command, said controller operable to generate said system control signal corresponding to said selected input command, after a controller delay period, if not so inhibited;

    (c) processing said selected input command using a logic device; and

    (d) producing an output signal from said logic device corresponding to said selected input command, as said system control signal, after a shorter delay from the time said monitoring step detects said selected input command than said controller delay period.

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