CN101853366B - Method and device for executing data access according to communication protocol processing - Google Patents
Method and device for executing data access according to communication protocol processing Download PDFInfo
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Abstract
The invention discloses a method and a device for executing data access according to communication protocol processing. The method comprises the following steps of: calculating a time slot time and a processing time upper limit required for executing specific data processing according to time slot information, a key time interval and a time slot number which are specified in a communication protocol; setting a frequency of a processor according to the processing time upper limit; and executing the data access by using the processor operating the frequency according to the time slot time. By the invention, the problem that the design is inelastic because the data access is executed by hardware and the non-real time problem generated in execution with software are prevented.
Description
Technical field
The present invention relates to a kind of data access mechanism, espespecially a kind of method and apparatus of processing executing data access through software according to a communications protocol.
Background technology
In the middle of the application of radio frequency identification (Radio-Frequency Identification, RFID), it is the very common practice that the mode of utilizing time slot (time slot) to detect is detected some device.For instance, one rfid system comprises a RFID reader (RFID reader) and plurality of radio frequency identification labels (RFID tag) conventionally, and each RFID label comprises a unique identifier (Unique IdentificationCode, UID code), RFID reader system reads unique identifier that each RFID label has with this RFID label of identification according to a RFID communications protocol.When an inductor of a gate control system have a plural number RFID label near time, for example 5 are respectively numbering 1, 2, 3, 4, 5 RFID label, inductor itself can first produce a plurality of time slots, for example 3, be respectively the 1st time slot, the 2nd time slot, the 3rd time slot, inform this this number of time slot 3 of 5 RFID labels simultaneously, and require these 5 RFID labels in time slot, to reply inductor, and RFID label can produce by the electric energy from inductor induction gained random number code, and calculate the number of time slot, and in the time slot that corresponds to this random number code, reply this inductor, if only having a RFID label in a time slot replys, inductor can this RFID label of identification, and require this RFID label to transmit a reply report, and this reply includes the unique identifier of this RFID label itself in reporting.If number of time slots is less than the number of RFID label, (in single time slot, having more than two RFID labels to reply) just can bump when a plurality of RFID labels are replied same RFID reader simultaneously, a plurality of RFID labels of replying in this time slot continue to reply by being left in the time slot of next stage, until all RFID labels are all by the identification of RFID reader institute.
Continue example above, if 5 random number reply inductors that RFID label produces because of self, in the 1st time slot, there is the RFID label of numbering 4 to reply, in the 2nd time slot, there is the RFID label of numbering 1,2 to reply, and the 3rd have in time slot the RFID label of numbering 3,5 to reply, in the time slot in this stage, inductor can only pick out the RFID label of numbering 4, remaining RFID label is by being left to the identification of proceeding in this way unique identifier in the time slot of next stage, until inductor picks out all RFID labels.
But generally speaking, utilize time slot to come the framework of arrangement for detecting conventionally all to adopt the mode of pure hardware to carry out implementation in addition.Please refer to Fig. 1, Fig. 1 is the block hardware diagram of traditional time slot detecting system 10.Tradition time slot detecting system 10 comprises a timer 12, a time slot controller 14 and a communications protocol processor 16.When will start to carry out time slot detecting, time slot controller 14 sees through the cycle length that a universal input output bus 18 is set time slot on timer 12, and when each time slot starts timing, timer 12 can be sent commencing signal (be generally a time slot and interrupt (slot interrupt) signal INT_S) the announcement slot controller 14 of a time slot, or uses the mode announcement slot controller 14 of a poll (poll).Timer 12 is after sending time slot look-at-me INT_S, and counting lasts one week time of phase; And now time slot controller 14 can, by unanimously carrying out activation communications protocol processor 16 by signal S_EN, make it start to process the operation of all relevant RFID communications protocol.When the operational processes of all RFID communications protocol complete, communications protocol processor 16 can be replied settling signal SC to time slot controller 14, and now time slot controller 14 will deenergize (disable) signal S_ENB and communications protocol processor 16 is quit work by one.
The time slot detecting system 10 forming with hardware has the flexible shortcoming lacking in design.Because the system of the internal circuit in communications protocol processor 16 and time slot controller 14 is designed for a certain RFID communications protocol, so in the time will changing applicable RFID communications protocol and maybe will change some detail size, just must redesign the RFID communications protocol that another set of hardware circuit is suitable for this wish change, therefore make quite inconvenience on design modifying.
Summary of the invention
Technical matters to be solved by this invention is to provide a kind of method and apparatus of processing executing data access according to communications protocol, has not only solved the upper inelastic problem of design, the not real-time problem producing in the time of simultaneously preventing from utilizing software to carry out again.
In order to solve above technical matters, the invention provides following technical scheme:
The invention provides a kind of method of processing executing data access according to communications protocol.The method comprises: according to the time slot of defined in a communications protocol (time slot) information, a crucial period (Tc) (critical time) and a number of time slots (Ns), calculate a slot time and process a required processing time upper limit with execution one particular data; According to this processing time upper limit, set a frequency frequency of a processor; And according to this slot time, carry out this data access with this processor that operates in this frequency frequency.
The present invention separately provides a kind of device of processing executing data access according to communications protocol.This device comprises a time slot clock generator and a processor.This time slot clock generator system is used for calculating a slot time according to the gap information of defined in a communications protocol, a crucial period and a number of time slots and processes a required processing time upper limit with execution one particular data.This processor system is used for carrying out this data access according to this slot time, and wherein the frequency frequency of this processor system sets according to this processing time upper limit.
The present invention provides a kind of method of carrying out executing data access according to communications protocol again.The method includes: a very first time length of finding out one first time slot according to this communications protocol; Set a number of time slots of a crucial period and this first time slot; According to this very first time length, this key period and this number of time slots, produce one second time slot; According to this second time slot, set a frequency signal; And carry out this data access according to this frequency signal.
What the present invention adopted processes the method and apparatus of executing data access according to communications protocol, to process according to a communications protocol, utilize time slot to carry out communications protocol processor and the handled part of time slot controller in the hardware system of arrangement for detecting, change into through software and processing, the elasticity of revising to increase it, and calculate a new slot time Tsn and carry out the required processing time Tp upper limit of this data processing, the appropriate frequency of selecting a processor to work, to guarantee the real-time of data processing.Not only solved the upper inelastic problem of design, the not real-time problem producing in the time of simultaneously preventing from utilizing software to carry out again.
Accompanying drawing explanation
Fig. 1 is the block hardware diagram of traditional time slot detecting system.
Fig. 2 is the process flow diagram of processing the method for executing data access according to a communications protocol of the present invention.
Fig. 3 is the comparison diagram of the new slot time new and old slot time under shorter.
Fig. 4 is the comparison diagram of the new and old slot time under new slot time is grown.
Fig. 5 is the present invention processes the device of executing data access function block schematic diagram according to a communications protocol.
[primary clustering symbol description]
10 time slot detecting system 12,506 timers
14 time slot controller 16 communications protocol processors
500 device 502 time slot clock generators
504 processor 508 storage devices
The signal 18 universal input output buss that INT_S time slot interrupts
The S_ENB signal S_EN enable signal that deenergizes
The crucial period Ns number of time slots of Tc
Tp processing time SC settling signal
The slot time of defined in Ts, Ts0, Ts1, Ts2, Ts3 communications protocol
Tsn, Tsn0, Tsn1, Tsn2, the slot time that Tsn3 is new
100,102,104,106,108,110,112,114,116,118,120,122 steps
Embodiment
In view of this, the present invention is directed to the shortcoming of the time slot detecting system inconvenience on design modifying being formed by hardware in prior art, a solution that adopts software is provided, also be about to communications protocol processor 16 and the performed part of time slot controller 14 in Fig. 1, seeing through software carries out, and through calculating new slot time (Tsn) and the upper limit in a processing time (Tp), set the frequency frequency of a processor, and by this processor that operates in this frequency frequency according to this slot time executing data access, can not produce not real-time problem when guaranteeing to use software to carry out.
Please refer to Fig. 2, Fig. 2 is the process flow diagram that carrys out the method for executing data access according to a communications protocol processing (protocol handling) of the present invention.The present invention processes the method for executing data access to comprise following steps according to a communications protocol:
Step 100: start.
Step 102: according to the slot time Ts of defined in a communications protocol, and a crucial period Tc and a number of time slots Ns calculate a new slot time Tsn and the upper limit of carrying out a particular data and process a required processing time Tp.
Step 104: according to this new slot time Tsn, set the frequency of a processor, and this processor operate under this frequency being set and to carry out following step.
Step 106: the slot time Tsn new according to this, this new slot time Tsn of initial timer timing.
Step 108: judge that this flow process should finish? (that is judge whether all time slots all counted complete) if not, performs step 110, if so, performs step 122.
Step 110: the time slot look-at-me transmitting according to timer, judges whether the timing of time slot starts? if so, perform step 112, if not, perform step 110.
Step 112: program (handshake) is held in the friendship of carrying out the RFID communications protocol of high frequency.
Step 114: whether judgement hands over the result of the program of holding correct? if so, perform step 116, if not, perform step 118.
Step 116: judgement is this time operating as a valid function, then performs step 120.
Step 118: judgement is this time operating as an invalid operation, then performs step 120.
Step 120: prepare to jump to next time slot, then get back to step 106.
Step 122: finish.
Method of the present invention first should be according to the slot time Ts of defined in a communications protocol, and one crucial period Tc and a number of time slots Ns calculate a new slot time Tsn (step 102), and the slot time Ts of defined in this communications protocol, namely aforesaid slot time required during all by hardware handles.Because hardware process speed is fast, do not have the problem having little time, that is must be in this communications protocol during all by hardware handles be disposed in the slot time of defined, therefore do not need to calculate in addition a new slot time Tsn, yet method of the present invention is to see through the flow process that software completes this time slot detecting, therefore need another calculating one new slot time Tsn can complete in real time to guarantee data processing.And crucial period Tc is the incipient a bit of time of slot time, in crucial period Tc, RFID label must be replied RFID reader signal, if reply RFID reader signal without any RFID label in crucial period Tc, in the time slot that represents to comprise this crucial period Tc, without any signal, reply, that is to say the time slot that this time slot has been.Number of time slots Ns is the number of time slot, and upper coherent in the time each other between each time slot.As for new slot time Tsn and the account form of carrying out the upper limit of the required processing time Tp of this data processing, will narration in detail in subsequent paragraph.
After obtaining new slot time Tsn, can set according to new slot time Tsn the frequency of processor, and make this processor work in the frequency setting to carry out follow-up flow process (step 104), that is to say, if new slot time Tsn expires, but the data in processor are calculated and are not yet completed, the speed that represents this processor is too slow, cannot reach the requirement of real time in data processing, therefore must reset a frequency frequency (clock frequency) faster, or select in addition a suitable processor.Then according to new slot time Tsn, processor is controlled timer and be take new slot time Tsn as cycle timing (step 106) while opening.As aforementioned, when each time slot starts timing, timer can be sent the commencing signal of a time slot, and the signal that is generally a time slot interruption (slot interrupt) is notified this processor, or uses the mode of a poll (poll) to notify this processor.After timer starts timing, processor need first judge whether this flow process should finish (step 108), if this non-last step, also gap is not also all counted not complete in real time, this flow process can be proceeded next step (step 110), otherwise, this flow process is with regard to the end (step 122) of directly jumping out.If judge, this flow process not yet finishes, and the next step time slot look-at-me that processor can continue to transmit according to timer judges whether the timing of time slot has started (step 110).If received the time slot look-at-me that timer transmits, the timing that represents time slot starts, can proceed next step 112, on the other hand, if not yet receive the time slot look-at-me that timer transmits, must, staying this step continuation wait, until receive this time slot look-at-me, could carry out next step 112.
Next just carry out the friendship of the RFID communications protocol of high frequency and hold program (step 112).This friendship program of holding is whether judgement has RFID label to reply RFID reader signal in aforesaid crucial period Tc, if and have RFID label to reply, further check whether data are correctly received, that is whether the preamble (preamble) that checks the data that RFID label transmits is correct, and whether there is collision that (step 114) occurs.If the data of replying without any RFID label reply, RFID label are incorrect or have collision to occur, this is operating as an invalid operation (step 118), on the other hand, if only have single RFID label, reply (that is collision does not occur), and the data of replying are correct, and RFID reader judges that this is a valid function (step 116).When the judgement of RFID reader is this time operating as a valid function (step 116), RFID reader for example can deposit data received in this time slot in, in one storage device (internal memory), then prepare to jump to next time slot, be ready for next time slot and receive another document (step 120).When the judgement of RFID reader is this time operating as an invalid operation (step 118), RFID reader can deposit an error code in above-mentioned storage device in, then similarly prepares to jump to another data (step 120) that next time slot receives next time slot.In step 120, be ready for running system that next time slot receives another data and check timer cycle of complete this new slot time Tsn of timing whether, if the cycle of new slot time Tsn expires, can directly get back to step 106 and carry out again next time slot of slot time Tsn timing that initial timer is new according to this; If the cycle of new slot time Tsn not yet expires, in the time of must waiting until complete this new slot time Tsn of timer timing, just can get back to the timing that step 106 restarts next time slot.As previously mentioned; after checking out the preamble of data; also need to carry out the inspection whether data are correct; Cyclical Redundancy Check (Cyclic Redundancy Check for example; and this part often can finish just to do afterwards because the processing time be delayed to whole time slot not CRC) or the inspection of check code (checksum).
The numbering that note that each step in Fig. 2 is an example, is not used for limiting the performed order of this step, allly allly can obtain the steps flow chart of identical result haply, is all contained in the scope that the present invention contains.
As for how to calculate new slot time Tsn and carry out a particular data and process a required processing time Tp, method provided by the present invention is as follows, and the number of time slot that please refer to Fig. 3 and Fig. 4 is the example of 4.Fig. 3 is the situation that processor calculating ability is stronger, and now required processing time Tp is shorter; Fig. 4 is the poor situation of processor calculating ability, and now required processing time Tp is longer.The top of Fig. 3 and Fig. 4 is time slot Ts0, time slot Ts1, time slot Ts2 and the time slot Ts3 of old slot time Ts (that is in communications protocol originally the slot time of defined), the beginning of every section of slot time has all indicated one section of crucial period Tc, below is time slot Tsn0, time slot Tsn1, time slot Tsn2 and the time slot Tsn3 of new slot time Tsn, and the end of every section of slot time has all attached one section of processing time Tp.As previously mentioned, in crucial period Tc, RFID label must be replied RFID reader signal, no matter therefore each section of time slot of new and old slot time all should be able to be contained crucial period Tc to judge whether there is the response of RFID label in this time slot.And the step of carrying out in processing time Tp at least needs to comprise judgement and is this time operating as a valid function or an invalid operation, and two steps preparing to jump to next time slot.The time slot Tsn1 of new slot time of Fig. 3 of take is example, when time slot that the time slot Tsn1 of new slot time has been (not having RFID label to reply RFID reader signal), after crucial period Tc, not having too many treatment step will carry out, therefore can very promptly enter and end process time T p, to enter next time slot Tsn2; In order to ensure the time slot Tsn2 of new slot time, will comprise but then the crucial period Tc of the time slot Ts2 of old slot time, the time slot Tsn2 of new time slot period again can not be too short.In like manner, the time slot Tsn1 of new slot time of Fig. 4 of take is example, while having RFID label to reply in the time slot Tsn1 of new slot time, the step that needs to carry out data check after crucial period Tc, therefore cannot very promptly enter immediately processing time Tp and soon end process time T p to enter next time slot Tsn2, must guarantee again that but then the time slot Tsn2 of new slot time will comprise the crucial period Tc of the time slot Ts2 of old slot time, therefore time slot Tsn2 and the processing time Tp of new time slot period again can not be oversize.Comprehensively above-mentioned, the computing formula of the upper limit of resulting new slot time Tsn and processing time Tp is as follows:
Tp≤(Ts-Tc)/Ns formula (1)
Tsn=Ts-(Ts-Tc)/Ns formula (2)
Wherein Ns is maximum total number of time slot of defined in communications protocol.
In this formula, Ns adopts maximum total number of time slot of defined in this communications protocol for calculating basis, because the total number of time slot of maximum of take be to calculate basis, the processing time Tp higher limit of gained is minimum, if the processing time Tp of gained can be less than this minimum processing time Tp higher limit, this processing time T p must be satisfied with other less total number of time slot Ns.If the frequency of processor system is fixing, cannot adjust, also the higher limit of capable of regulating processing time Tp, and reset the work that should carry out in processing time Tp, at least must execute judgement and this time be operating as two steps that next time slot is jumped in a valid function or an invalid operation and preparation, remaining work can be left to whole time slot and finish just to do afterwards.
With near-field communication protocol processes (Near Field Communication protocol, NFC212/424/848protocols) to the detecting of single device (Single Device Detection), be example, if according to defined slot time Ts in this communications protocol, and the crucial period Tc of selection is 720us, number of time slot is in 16, and new slot time Tsn can be calculated as:
Ts＝256*64/fc(13.56MHz)＝1208.2596us
Tc＝720us
Ns＝16
Tp≤(Ts-Tc)/Ns
Tp≤30.516225us
Tsn＝Ts-(Ts-Tc)/Ns
Tsn＝1177.743375us
Refer to Fig. 5, Fig. 5 is that the present invention processes the function block schematic diagram of the device 500 of executing data access according to a communications protocol.Device 500 of the present invention includes (but being not limited to) time slot clock generator 502, a processor 504, a timer 506 and a storage device 508.Time slot clock generator 502 is for calculating a new slot time Tsn according to the gap information Ts of defined in a communications protocol, a crucial period Tc and a number of time slots Ns and carrying out a particular data and process a required processing time Tp upper limit, processor 504 is for according to this new slot time Tsn executing data access, and wherein the frequency frequency of processor 504 can set according to the upper limit of this processing time Tp and the command quantity of required execution.In addition, timer 506 is for the slot time Tsn timing new according to this, and produce the commencing signal (being generally the signal INT_S that a time slot interrupts) of a time slot, and storage device 508 is the judged result producing for storing processor 504, wherein processor 504 is to receive the signal INT_S that this time slot that timer 506 transmits interrupts, the data of judgement in time slot to be to produce this judged result, and judge whether the new slot time Tsn of 506 timing of timer expires.In this embodiment, processor 504 is that the mode by executive software realizes communications protocol processor 16 and the performed function of time slot controller 14 in Fig. 1, and timer 506 is to carry out implementation in addition in the mode of pure hardware.The running system of the device 500 shown in Fig. 5 follows the flow process shown in Fig. 2, and the present invention processes the technology contents of the method for executing data access to be specified according to communications protocol, therefore, have the knack of this skill person and should understand easily function and the running of each assembly in the device 500 shown in Fig. 5 after reading above-mentioned paragraphs, therefore for instructions for purpose of brevity, be discussed in this and just separately do not repeat.
In a word, the present invention will process according to a communications protocol, utilize time slot to carry out communications protocol processor and the handled part of time slot controller in the hardware system of arrangement for detecting, change into through software and processing, the elasticity of revising to increase it, and calculate a new slot time Tsn and carry out the required processing time Tp upper limit of this data processing, the appropriate frequency of selecting a processor to work, to guarantee the real-time of data processing.Method of the present invention had both solved the upper inelastic problem of design, and the not real-time problem producing in the time of simultaneously preventing from utilizing software to carry out is again a practice easily effectively again in fact.
The foregoing is only preferred embodiment of the present invention, all equalizations of doing according to the present patent application the scope of the claims change and modify, and all should belong to covering scope of the present invention.
Claims (20)
1. according to communications protocol, process a method for executing data access, it is characterized in that, comprise:
According to a slot time of defined in a communications protocol, and one crucial period and a number of time slots calculate a new slot time and carry out a particular data and process a required processing time upper limit, this slot time system required time during all by hardware handles, this key period is a period of time that this slot time has just started;
According to this processing time upper limit, set a frequency of a processor; And
With this processor that operates in this frequency, according to this new slot time, carry out this data access.
2. the method for processing executing data access according to communications protocol as claimed in claim 1, is characterized in that, also comprises the steps:
With this processor that operates in this frequency, come:
An initial timer starts this new slot time of timing;
Judge whether to receive the commencing signal of the time slot that this timer transmits;
The commencing signal of this time slot that this timer transmits if receive, then judges the data in this time slot and produces a judged result;
Store this judged result; And
Whether this new slot time that judges this timer institute timing expires.
3. the method for processing executing data access according to communications protocol as claimed in claim 2, is characterized in that, the commencing signal of this time slot that this timer transmits is a look-at-me.
4. the method for processing executing data access according to communications protocol as claimed in claim 2, is characterized in that, the commencing signal of this time slot that this timer transmits is a polling signal.
5. the method for processing executing data access according to communications protocol as claimed in claim 1, is characterized in that, this new slot time system determines according to a slot time of defined in this communications protocol, this key period and this number of time slots.
6. the method for processing executing data access according to communications protocol as claimed in claim 1, it is characterized in that, carry out this particular data and process required this upper limit system in processing time and determine according to a slot time of defined in this communications protocol, this key period and this number of time slots.
7. the method for processing executing data access according to communications protocol as claimed in claim 1, is characterized in that, it is a near-field communication protocol processes that this communications protocol is processed.
8. according to communications protocol, process a device for executing data access, it is characterized in that, comprise:
One time slot clock generator, be used for calculating a new slot time according to the slot time of defined in a communications protocol, a crucial period and a number of time slots and process a required processing time upper limit with execution one particular data, this slot time system required time during all by hardware handles, this key period is a period of time that this slot time has just started; And
One processor, is used for carrying out this data access according to this new slot time, and wherein the frequency of this processor system sets according to this processing time upper limit.
9. the device of processing executing data access according to communications protocol as claimed in claim 8, is characterized in that, separately comprises:
One timer, is used for the slot time timing new according to this, and produces the commencing signal of a time slot; And
One storage device is the judged result producing for storing this processor;
Wherein this processor system receives the commencing signal of this time slot that this timer transmits, and judges that data in this time slot are to produce this judged result, and judges whether this new slot time of this timer institute timing expires.
10. the device of processing executing data access according to communications protocol as claimed in claim 9, is characterized in that, the commencing signal of this time slot that this timer produces is a look-at-me.
11. devices of processing executing data access according to communications protocol as claimed in claim 9, is characterized in that, the commencing signal of this time slot that this timer produces is a polling signal.
12. devices of processing executing data access according to communications protocol as claimed in claim 8, it is characterized in that, this time slot clock generator system calculates this new slot time according to a slot time of defined in this communications protocol, this key period and this number of time slots.
13. devices of processing executing data access according to communications protocol as claimed in claim 8, it is characterized in that, this time slot clock generator system calculates this particular data of execution according to a slot time of defined in this communications protocol, this key period and this number of time slots and processes this required processing time upper limit.
14. devices of processing executing data access according to communications protocol as claimed in claim 8, is characterized in that, it is a near-field communication protocol processes that this communications protocol is processed.
15. 1 kinds of methods of carrying out executing data access according to communications protocol, is characterized in that, include:
(a) according to this communications protocol, find out a very first time length of one first time slot;
(b) set a number of time slots of a crucial period and this first time slot;
(c) according to this very first time length, this key period and this number of time slots, produce one second time slot;
(d) according to this second time slot, set a frequency signal; And
(e) according to this frequency signal, carry out this data access.
16. methods of carrying out executing data access according to communications protocol as claimed in claim 15, is characterized in that, this step (e) includes:
(e1) according to this frequency signal, decide the initial time of this second time slot;
(e2) receive a data-signal; And
(e3) friendship of carrying out communications protocol is held.
17. methods of carrying out executing data access according to communications protocol as claimed in claim 16, is characterized in that, more include:
(f) check whether data-signal can be correctly received.
18. methods of carrying out executing data access according to communications protocol as claimed in claim 17, is characterized in that, this step (f) includes:
(f1) check whether this data-signal has collision to produce; Or
(f2) check that whether the preamble of this data-signal is correct.
19. methods of carrying out executing data access according to communications protocol as claimed in claim 17, is characterized in that, more include:
(g) be ready for next time slot and receive another data-signal.
20. methods of carrying out executing data access according to communications protocol as claimed in claim 19, is characterized in that, carried out, and the method more include by a microprocessor:
(h) according to the time span of the action of step (f) and step (g), this very first time length and the second time slot, decide an operating frequency of this microprocessor;
Wherein this operating frequency system is chosen to be, and within the mistiming of the time span of this very first time length and the second time slot, this microprocessor can completing steps (f) and the action of step (g).
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| CN1270685A (en) * | 1997-09-19 | 2000-10-18 | 库比克公司 | Contactless proximity automated data collection system and method |
| CN1692566A (en) * | 2002-12-17 | 2005-11-02 | 索尼株式会社 | Communication system, communication method, and data processing device |
| WO2008027622A2 (en) * | 2006-09-01 | 2008-03-06 | Intermec Ip Corp. | Rfid tags with cdma communication capabilities |
| CN101295344A (en) * | 2007-04-25 | 2008-10-29 | 北京中电华大电子设计有限责任公司 | Method for CPU processing received data in radio frequency non-contact smart card |
| CN101051356A (en) * | 2007-05-16 | 2007-10-10 | 上海华龙信息技术开发中心 | Novel active radio frequency identifying system and its operationn method |
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