Double interface SD flash memory card

  • US 7,809,866 B2
  • Filed: 08/12/2002
  • Issued: 10/05/2010
  • Est. Priority Date: 08/12/2002
  • Status: Active Grant
First Claim
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1. A double interface flash memory card, which has a first transmission interface and a circuit board with a microprocessor and a plurality of flash memory thereon, comprising:

  • a first bus interface circuit especially for a system interface circuit of the flash memory card being able to perform signal transmission;

    a second bus interface circuit for the other information apparatuses, which are different from the flash memory card, being able to perform signal transmission; and

    an interface detection and switching circuit, electrically connecting with the first transmission interface, the first bus interface circuit and the second bus interface circuit for detecting if there is an initializing signal generated from the system interface circuit and switching to the first bus interface circuit or the second bus interface circuit according to the initializing signal being generated or not generated;

    wherein, the microprocessor switches the status thereof to a working mode and a suitable system interface circuit mode is started according to what type of the system interface circuit being detected by the interface detection and switching circuit so that the microprocessor can detect, determine and support a connection action signal automatically;

    when either the first transmission interface or the second transmission interface offers the action signal at the transmission end thereof and, in the mean time, the microprocessor switches the circuit and the related electronic elements on the circuit board to support data transmission action of the first transmission interface or the second transmission interface in the flash memories.

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