Contactless cpu card communication monitor

A non-contact, card communication technology, applied in the communication monitoring field of non-contact CPU cards, can solve the problems of data loss, reduced precision, poor real-time performance, etc., to achieve the effect of no data loss, improved real-time performance, and stable processing mechanism

CN105868082BActive Publication Date: 2019-04-02GUANGDONG CHUTIAN DRAGON SMART CARD

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Patent Information

Authority / Receiving Office: CN · China
Patent Type: Patents(China)
Current Assignee / Owner: GUANGDONG CHUTIAN DRAGON SMART CARD
Publication Date: 2019-04-02

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Abstract

The invention provides a non-contact CPU (Central Processing Unit) card communication monitor and relates to a communication monitoring technique of a non-contact CPU card. The invention solves the problems of serious data loss and low precision caused by poor instantaneity of the present non-contact CPU card communication monitor. A filtering unit and a decoding unit are embedded in a decoding module of the non-contact CPU card communication monitor; the filtering unit is used for judging if the amplitude of a carrier signal is changed in n continuous ETU (Elementary Time Unit) time, and if yes, the carrier signal is sent to the decoding unit for decoding; the decoded data is sent to the memory of an MCU (Micro-programmed Control Unit) by the decoding unit through an SSC interface of the MCU; and the MCU is used for reducing the data in the memory into a command-response pair to be stored in a cache unit, and within non-interaction slot time, the command-response pair is uploaded to a PC. According to the invention, useless signals are filtered, the DMA transmission is adopted and the high-capacity cache is developed in the MCU, so that the precision of the monitor can reach above 95% and the monitor is suitable for the development of a non-contact CPU card reader-writer.

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Description

technical field

[0001] The invention relates to the communication monitoring technology of a non-contact CPU card. Background technique

[0002] In the development process of the non-contact CPU card reader, it is necessary to use the non-contact CPU card communication monitor to detect the original signal in the ISO14443 communication channel, restore the command-response pair between the reader and the card, and provide the reader or Card design, development and testing personnel provide data reference during product debugging and testing. At present, the common non-contact CPU card communication monitor on the market, its internal MCU restores the command-response and uploads data through USB. This processing mechanism causes serious data loss due to poor real-time performance, and the accuracy of the monitor can only reach 80. %~85%. Contents of the invention

[0003] The purpose of the present invention is to provide a high-precision non-contact CPU card communicati...

Claims

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