Semiconductor integrated circuit device and noncontact ic card

Abstract

The present invention is directed to shorten time required to establish a connection and enable information to be actually transmitted/received in a noncontact IC card adaptable to a plurality of communication methods. A semiconductor integrated circuit device of the invention includes: a single demodulating circuit capable of demodulating an input signal; a plurality of sampling circuits each capable of sampling output signals of the demodulating circuit synchronously with a predetermined clock signal; a plurality of detection circuits capable of detecting headers of output signals of the corresponding sampling circuits; a plurality of processing circuits capable of performing a predetermined data process on the basis of detection results of the corresponding detection circuits; and a communication method determining circuit capable of determining a match to a preset communication method from results of the header detection by the plurality of detection circuits. By performing processes adapted to a plurality of different communication methods in parallel, time required to establish a connection and enable information to be actually transmitted/received is reduced.

1 . A semiconductor integrated circuit device comprising: 
 a demodulating circuit capable of demodulating an input signal;    a plurality of sampling circuits which are commonly connected to an output of said demodulating circuit and each capable of sampling output signals of said demodulating circuit synchronously with a predetermined clock signal;    a plurality of detection circuits arranged in correspondence with said sampling circuits and capable of detecting headers of output signals of said corresponding sampling circuits;    a plurality of processing circuits disposed in correspondence with said plurality of detection circuits and capable of performing a predetermined data process on the basis of detection results of said corresponding detection circuits; and    a communication method determining circuit capable of determining a match to a preset communication method from results of the header detection by said plurality of detection circuits.    
     
     
         2 - 7 . (canceled)