Data processing apparatus using reader/writer and data carrier
First Claim
1. A data processing apparatus for performing at least a data reading operation from data carriers by a reader/writer, whereinsaid data carrier comprises:
- a memory for holding data;
response means for returning a predetermined signal in accordance with the data read out from said memory when receiving a predetermined command from said reader/writer;
response permitting means for permitting said response means to return the data; and
data collating means for collating data for collation added to a data collation command transmitted from said reader/writer and the data held in said memory and, when the collation succeeds, for permitting the reading of next data,said reader/writer comprises;
response permission command means for permitting said response means of said data carrier to permit the return of the data;
data return command means for returning a signal corresponding to the data from said memory held in said data carrier;
decoding means for decoding the reception data returned from said data carrier; and
data collation command means for allowing said data collating means of said data carrier to collate said reception data decoded by said decoding means.
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Accused Products
Abstract
A response permission command is transmitted from a reader/writer, thereby setting all of data carriers to a response possible state. Subsequently, a data return command is transmitted, thereby returning data for collation on a bit unit basis. The reader/writer transmits a data collation command of, for example, bit 0 to each of the data carriers when recognizing the return of the data in which bits 0 and 1 mixedly exist. When an own return bit coincides with a collation bit, each of the data carrier judges that the collation succeeds and returns a next bit for collation. When they don'"'"'t coincide, however, a state of the data carrier is switched to a response inhibition state. By repeating such processes with respect to all of the bits of the data for collation, only one data carrier finally remains in a response possible state and generates an access permission command, thereby performing the reading or writing operation. When the operation is finished, the state is switched to an access inhibition state by an access inhibition command. The processes from the transmission of the response permission command are again repeated for the remaining data carriers.
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Citations
21 Claims
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1. A data processing apparatus for performing at least a data reading operation from data carriers by a reader/writer, wherein
said data carrier comprises: -
a memory for holding data; response means for returning a predetermined signal in accordance with the data read out from said memory when receiving a predetermined command from said reader/writer; response permitting means for permitting said response means to return the data; and data collating means for collating data for collation added to a data collation command transmitted from said reader/writer and the data held in said memory and, when the collation succeeds, for permitting the reading of next data, said reader/writer comprises; response permission command means for permitting said response means of said data carrier to permit the return of the data; data return command means for returning a signal corresponding to the data from said memory held in said data carrier; decoding means for decoding the reception data returned from said data carrier; and data collation command means for allowing said data collating means of said data carrier to collate said reception data decoded by said decoding means. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A data processing apparatus for performing at least a data reading operation from data carriers by a reader/writer, wherein
said data carrier comprises: -
a memory for holding data; and data collating means for collating data for collation added to a data collation command sent from said reader/writer and data held in said memory and, when the collation succeeds, for permitting the reading of next data and said reader/writer comprises; response permission command means for allowing response means of said data carrier to permit the return of the data; data return command means for returning a pseudo random signal according to the data from said memory held in said data carrier; correlation operating means for calculating an auto-correlation between the pseudo random signal returned from said data carrier and a predetermined pseudo random signal; decoding means for decoding reception data from the auto-correlation obtained from said correlation operating means; and data collation command means for allowing said data collating means of said data carrier to collate the reception data decoded by said decoding means. - View Dependent Claims (11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21)
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Specification