CN102122362B

CN102122362B - Method for improving communication rate of contact-type intelligent card

Info

Publication number: CN102122362B
Application number: CN2010100224875A
Authority: CN
Inventors: 薛平
Original assignee: BEIJING HUAHONG INTEGRATED CIRCUIT DESIGN Co Ltd
Current assignee: Beijing Huahong Integrated Circuit Design Co., Ltd.
Priority date: 2010-01-07
Filing date: 2010-01-07
Publication date: 2013-12-11
Anticipated expiration: 2030-01-07
Also published as: CN102122362A

Abstract

The invention provides a method for improving communication rate of a contact-type intelligent card, which comprises the following steps of: performing data transmission by adopting a mode that a hardware circuit control logic unit automatically switches receiving and transmitting of data; implementing data caching by adopting a first-in first-out (FIFO) mode in the transmission process, and independently controlling FIFO receiving and FIFO transmitting respectively; and generating an interrupt once a byte is accurately received when the data are received, and generating an interrupt after the data in all caches are totally accurately transmitted when the data are transmitted. By adopting the mode that the hardware circuit control logic unit automatically switches receiving and transmitting of the data, the communication rate of the contact-type intelligent card is not affected by the application software processing rate in the card, so the time of processing the software in the card can be increased, and the stability and the processing efficiency of the application software of the intelligent card can be effectively improved.

Description

A kind of method that improves communication rate of contact-type intelligent card

Technical field

The present invention relates to a kind of method that improves the integrated circuit traffic rate, relate in particular to a kind of method that improves communication rate of contact-type intelligent card.

Background technology

IC-card (integrated circuit card) or title smart card, be a kind of plastic cards of credit card sized size, encapsulated in card and comprised storage encryption, and the integrated circuit (IC) chip module of data-handling capacity.That IC-card has is antimagnetic, electrostatic prevention, damage resistance and durability strong, antifalsification is good, the storage data capacity is large, safe, application apparatus and system network environment cost are low, the characteristics such as technical manual maturation.Along with smart card enters in the daily life application of people, such as consumption card, social security card, mass transit card etc., its high security now more and more is subject to people's generally attention, in increasing field, replaces magnetic card and other data card, has obtained application more and more widely.

The communication interface of smart card is divided into contact and contactless two kinds of forms, ISO/IEC 7816 standards are ISO (International Organization for Standardization, International Standards Organization) and IEC (International Electrotechnical Commission, International Electrotechnical Commission) the Contact Type Ic Card standard of definition, third part ISO/IEC 7816-3 part standard in its standard electric interfaces and host-host protocol, comprise the character format of data transmission and command format etc., the theoretical highest communication speed of supporting is 625kbps.But, in actual application, contact intelligent card adopts traditional realization mechanism more, the problem that exists a lot of software and hardwares to coordinate, its communication digit rate can only reach the speed of 112kbps at most, and this situation has affected the demand of data transmission in the application greatly.

Summary of the invention

The object of the invention provides a kind of method that improves communication rate of contact-type intelligent card, and the communications protocol based on the ISO/IEC7816-3 standard improves its communication digit rate, and ideal value reaches 625kbps, meets the demand of application.

A kind of method that improves communication rate of contact-type intelligent card comprises following content:

(1) pattern that adopts the automatic switchover of hardware circuit steering logic unit to receive or send data is advanced

The row data transmission;

(2) in transmitting procedure, adopt the FIFO mode to realize data buffer storage, receive FIFO and send FIFO

Independent control respectively;

(3), while receiving data, byte of every correct reception produces once interrupts, and sends data time institute

There are the data in buffer memory all after correct the transmission, to be produced and interrupt.

When data transmission procedure, acquiescence is in receiving mode.While having data to send, arrange data are write and send FIFO (First-in First-out by software, first in first out), the mode control logic unit automatically switches to sending mode, by sending the steering logic unit, the data in FIFO is sent.After successfully sending the interior all data of buffer memory, the mode control logic unit can be switched to receiving mode within the stand-by period.When reception steering logic unit receives new data, it is write and receive FIFO and processed by interrupting the annoyware program.

In data are carried out to the process of buffer memory, but a plurality of byte datas of buffer memory, and the FIFO size is determined by system requirements.According to definite content in ISO/IEC 7816 standards, the order length of each communication is 5 bytes, the longest 256 bytes of data length, and FIFO can be defined as the arbitrary value in 5～256 bytes according to demand.Can suitably increase the size of FIFO under the prerequisite that reduces as far as possible the hardware design resource, give the processing time of software abundance.Receive FIFO and send FIFO independent control respectively, when receiving, hardware circuit can receive a plurality of data, and while sending data, software can write many byte datas of FIFO at every turn, between the data of reception and the data of transmission, can not produce mutually conflict.

When receiving data, byte of every correct reception produces once interrupts, generation at once after the judgement parity check bit is correct.Software can have more 2 bit times and carry out the data processing; When sending data, data in all buffer memorys produce and interrupt again after all correctly being sent, smart card software can disposablely all write buffer memory to all data that send that need, perhaps disposablely can't all write fashionable can in batches writing, send again the next group data being sent completely after a collection of at every turn.

Adopt implementation method provided by the invention, the communication speed of contact intelligent card can not be subject to the impact of the interior application software of card processing speed, can increase like this time that in card, software is processed, and can effectively improve stability and the treatment effeciency of smart card application software.

The accompanying drawing explanation

A kind of method schematic diagram that improves communication rate of contact-type intelligent card of Fig. 1

Hardware interface schematic diagram in Fig. 2 ISO/IEC 7816 standards

Communication character format schematic diagram in Fig. 3 ISO/IEC 7816 standards

Embodiment

Below in conjunction with each accompanying drawing, content of the present invention is described in detail:

Fig. 3 is the character transmission form of stipulating in ISO/IEC 7816 standards, and each byte transmission comprises a start bit, 8 data bit, parity check bit, and stand-by period.The low level that wherein start bit is a bit time, the high level that the stand-by period is 2 bit times, sending a required time of complete bytes is 12 bit times.Start bit representative data transmission starts, and the take over party starts to receive data after receiving start bit, and, according to the correctness of parity check bit verification msg, as incorrect, requires to retransmit.

The method schematic diagram that Fig. 1 is raising communication rate of contact-type intelligent card provided by the present invention, the module diagram that Fig. 2 is ISO/IEC 7816 standard interfaces that relate in the present invention, comprise mode control logic unit, sending and receiving steering logic unit, sending and receiving FIFO, input/output port and CPU element.The mode control logic unit, for the switching of receiving mode and sending mode, is switched to sending mode while in sending FIFO, having the data that are not sent out; After data in all transmission FIFO successfully are sent completely, switch to receiving mode.Send logic according to the character transmission form of stipulating in ISO/IEC 7816 standards, data are sent by input/output port, the receive logic unit receives the data of input/output port according to same transformat, and store in reception FIFO, send FIFO and receive FIFO respectively as the data buffer storage under the sending and receiving pattern, independent control.

The size of FIFO determines according to system requirements, and according to stipulating in ISO/IEC 7816 standards, the order length of each communication is 5 bytes, the longest 256 bytes of data length, and FIFO can be decided to be the arbitrary value in 5～256 bytes as required.Can suitably increase the size of FIFO under the prerequisite that reduces as far as possible hardware resource, give the interior software of smart card with the sufficient processing time.

When data receiver, produce once and interrupt whenever correctly receiving byte, after the judgement parity check bit is correct, produce at once, therefore make software have more 2 bit times and carry out other processing.When sending data, produce and interrupt again after the data in all buffer memorys all correctly are sent completely, smart card software can disposablely all write buffer memory to all data that send that need like this, once can't all write fashionable can in batches writing, be sent completely a collection of next group that sends again at every turn, can increase like this time that smart card software is processed, contribute to improve stability and the treatment effeciency of software.

Claims

1. a method that improves communication rate of contact-type intelligent card is characterized in that comprising following content:

(1) pattern that adopts the automatic switchover of hardware circuit steering logic unit to receive or send data is carried out data transmission;

(2) in transmitting procedure, adopt the FIFO mode to realize data buffer storage, receive FIFO and send FIFO independent control respectively;

(3) while receiving data, byte of every correct reception produces once interrupts, and the data while sending data in all buffer memorys are all produced and interrupt after correct transmission;

It is characterized in that, when data transmission, ware circuit mode control logic unit is defaulted as receiving mode, when receiving data, hardware circuit receives the steering logic unit and can receive one or more data simultaneously, and while sending data, smart card software can write the one or more byte datas of FIFO at every turn.

2. a kind of method that improves communication rate of contact-type intelligent card as claimed in claim 1, it is characterized in that: in process of caching, smart card software is disposable all writes the data of required transmission buffer memory or writes buffer memory in batches.