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Transponder interface circuit

  • US 5,488,376 A
  • Filed: 04/26/1994
  • Issued: 01/30/1996
  • Est. Priority Date: 04/26/1994
  • Status: Expired due to Term
First Claim
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1. A transponder interface circuit interposed between a transponder controller and an external interface, said external interface being in electrical communication with circuitry that is external to said transponder, said transponder interface circuit comprising:

  • a) an interface controller operable to communicate with said transponder controller;

    b) a buffer memory interposed between said transponder controller and said external interface; and

    a clock selection multiplexer for passing a data clocking signal to said buffer memory from one of at least two sources, the first source being said the signal derived from the transponder;

    clock, and the second source being the clock signal originating in said external circuitry, the appropriate source being chosen by a signal to the multiplexer from said interface controller and chosen to correspond with whichever of the transponder and the external circuitry is accessing buffer memory.

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