PC-card having several communication protocols

  • US 5,420,412 A
  • Filed: 01/25/1993
  • Issued: 05/30/1995
  • Est. Priority Date: 01/30/1992
  • Status: Expired due to Term
First Claim
Patent Images

1. A PC-card able to communicate with a card reader according to several different communication protocols comprising in the card:

  • several conversion circuits (CNV1, CNV2, CNV3), each of which is able to convert into instructions, performable by the card, the electrical signals received from the reader according to a given protocol, each of the different conversion circuits corresponding to a different communication protocol,and a protocols select, on circuit (CNVA, L0, L1, L2, L3, G1 to G6), incorporating an auxiliary conversion circuit (CNVA), the latter being able to produce specific instructions performable by the card, said specific instructions being used for the selection of one of the conversion circuits and being produced from electrical signals which can be produced in all the protocols, and having between five and eight contacts, including a clock contact CLK, a data input-output contact I/O and a reset contact RST, wherein the auxiliary conversion circuit essentially uses the signals present on the contacts CLK and RST for producing protocol selection instructions.

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