CN107465418A - A kind of 14443Type A transmitting coding circuits for supporting 4 kinds of communication speeds - Google Patents
A kind of 14443Type A transmitting coding circuits for supporting 4 kinds of communication speeds Download PDFInfo
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- CN107465418A CN107465418A CN201710877765.7A CN201710877765A CN107465418A CN 107465418 A CN107465418 A CN 107465418A CN 201710877765 A CN201710877765 A CN 201710877765A CN 107465418 A CN107465418 A CN 107465418A
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- frame sequence
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- bit
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- 238000004891 communication Methods 0.000 title claims abstract description 17
- 230000005540 biological transmission Effects 0.000 claims abstract description 5
- 238000006073 displacement reaction Methods 0.000 claims description 3
- 238000010586 diagram Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 1
- 238000009432 framing Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
Classifications
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
- H04B1/02—Transmitters
- H04B1/04—Circuits
-
- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F13/00—Interconnection of, or transfer of information or other signals between, memories, input/output devices or central processing units
- G06F13/38—Information transfer, e.g. on bus
- G06F13/382—Information transfer, e.g. on bus using universal interface adapter
- G06F13/385—Information transfer, e.g. on bus using universal interface adapter for adaptation of a particular data processing system to different peripheral devices
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B5/00—Near-field transmission systems, e.g. inductive or capacitive transmission systems
- H04B5/40—Near-field transmission systems, e.g. inductive or capacitive transmission systems characterised by components specially adapted for near-field transmission
- H04B5/48—Transceivers
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B5/00—Near-field transmission systems, e.g. inductive or capacitive transmission systems
- H04B5/70—Near-field transmission systems, e.g. inductive or capacitive transmission systems specially adapted for specific purposes
- H04B5/77—Near-field transmission systems, e.g. inductive or capacitive transmission systems specially adapted for specific purposes for interrogation
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L1/00—Arrangements for detecting or preventing errors in the information received
- H04L1/0001—Systems modifying transmission characteristics according to link quality, e.g. power backoff
- H04L1/0002—Systems modifying transmission characteristics according to link quality, e.g. power backoff by adapting the transmission rate
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L69/00—Network arrangements, protocols or services independent of the application payload and not provided for in the other groups of this subclass
- H04L69/26—Special purpose or proprietary protocols or architectures
-
- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F2213/00—Indexing scheme relating to interconnection of, or transfer of information or other signals between, memories, input/output devices or central processing units
- G06F2213/38—Universal adapter
- G06F2213/3852—Converter between protocols
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- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Signal Processing (AREA)
- Theoretical Computer Science (AREA)
- Quality & Reliability (AREA)
- Computing Systems (AREA)
- Computer Security & Cryptography (AREA)
- Physics & Mathematics (AREA)
- General Engineering & Computer Science (AREA)
- General Physics & Mathematics (AREA)
- Compression, Expansion, Code Conversion, And Decoders (AREA)
Abstract
The invention discloses a kind of 14443 Type A for supporting 4 kinds of communication speeds to launch coding circuit, including：One programmable clock counter, for 4 kinds of communication speed patterns, 4 kinds of clock counts are realized accordingly；One frame sequence maker, add frame head SOC and postamble EOC, Serial output frame sequence respectively in the front and back of parallel data to be sent；One bit digit counters, the bit positions of the frame sequence of transmission are counted, for redirecting for the state machine inside control frame sequence generator；One modified Miller code encoder, according to the coded format of regulation, selection uses coded sequence, produces coding output.The present invention supports 4 kinds of communication speeds, improves the compatibility of system, reduces cost of investment.
Description
Technical field
The present invention relates to a kind of circuit, especially a kind of 14443 Type-A transmitting coding circuits for supporting 4 kinds of communication speeds.
Background technology
With the development of social economy and the continuous improvement of the level of informatization, the contactless smart IC in near-field communication field
Card obtains more and more extensive application.Support Type-A types as defined in the agreements of ISO/IEC 14443 of near-field communication are should
With a widest type, while in view of a variety of application scenarios have different requirements to communication speed, agreement is also advised
The different communication speed patterns of 4 kinds of 106Kbps, 212Kbps, 424Kbps and 848Kbps etc. are determined.
Non-contact reader-writer as part important near field communication system, it is necessary to support 14443 Type-A and
4 kinds of communication speeds.The compatibility of system can be thus improved, reduces the cost of investment of system.
The content of the invention
The technical problem to be solved in the present invention is to provide a kind of transmitting coding circuit for supporting 14443 Type-A agreements, energy
It is enough that write operation is carried out to Non-contact Intelligent IC Card with 4 kinds of communication speeds, so as to adapt to different application scenarios, effectively improve and be
The compatibility of system, reduce the cost of investment of system.
In order to solve the above technical problems, the 14443 Type-A transmitting codings proposed by the present invention for supporting 4 kinds of rate modes
Circuit（As shown in Figure 1）Including following submodule：
Programmable clock counter, it is real respectively for 4 kinds of rate modes such as 106Kbps, 212Kbps, 424Kbps and 848Kbps
Existing 128 clock counts, 64 clock counts, 32 clock counts and 16 clock counts, produce clock count signal clk_
Cnt and count completion signal etu_done.
Frame sequence maker, inside include state machine and parallel-to-serial converter.According to as defined in 14443 Type-A agreements
Send data frame format（As shown in Figure 2）, frame head is added respectively in parallel data tx_data to be sent front and back
SOC and postamble EOC, Serial output frame sequence frm_seq.
Bit digit counters, the frame sequence frm_seq of transmission bit positions are counted, produce bit positions count signal
Bit_cnt, for the displacement Serial output redirected with parallel-to-serial converter of the state machine inside control frame sequence generator.
Modified Miller code encoder, according to modified Miller code（Modified Miller）Coded format（Such as Fig. 3 institutes
Show）, produce Encoded output signal tx_code.
Circuit structure of the present invention is simple, and it is easy to realize.Wherein, one etu length of programmable clock counter indoor design
Register is spent, the value of the register can be configured as 127,63,31 and 15 according to 4 kinds of rate modes, realize clock count
It is programmable.Modified Miller code decoder internal devises two registers, i.e. groove starts register and groove end register,
For carving at the beginning of to groove and finish time is controlled, the adjustable of recess width is realized；Also increase inside it in addition
A register is added, for recording the value of a upper bit position for bit positions to be sent, to determine current logic to be sent
The coding of " 0 " is using Sequency Y or using Sequency Z.
Brief description of the drawings
The present invention is further detailed explanation with embodiment below in conjunction with the accompanying drawings：
Fig. 1 is the structure chart of the transmitting coding circuit of supporting rate pattern proposed by the present invention；
Fig. 2 is the transmission data frame format schematic diagram of the agreement Type-A type stateds of ISO/IEC 14443；
Fig. 3 is the amendment miller coding form schematic diagram of the agreement Type-A type stateds of ISO/IEC 14443.
In figure：1st, programmable clock counter；2nd, bit digit counters；3rd, frame sequence maker；4th, modified Miller code encodes
Device.
Embodiment
With reference to shown in Fig. 1,14443 Type-A for supporting 4 kinds of communication speeds launch coding circuit in following implementation
In example, including：
One programmable clock counter 1, one etu length register of indoor design.Its input has clock signal of system clk
（System operating frequency as defined in the agreements of ISO/IEC 14443 is 13.56MHz）With rate mode signal speed_mode [1:0],
Output has clock count signal clk_cnt and count completion signal etu_done.Rate mode believes speed_mode [1:0] encode
For 00,01,10 and 11,4 kinds of rate modes such as 106Kbps, 212Kbps, 424Kbps and 848Kbps are correspond to respectively.Therefore,
The value of etu length registers can be configured to 127,63,31 and 15 accordingly.Clock counter according to the value of this register,
Can realizes 128 clock counts or 64 clock counts or 32 clock counts, or 16 clock counts, from
And realize the support to 4 kinds of communication speeds.Count completion signal etu_done when counter counts have expired an etu length,
Logical one is exported, otherwise exports logical zero.
One frame sequence maker 3, inside include state machine and parallel-to-serial converter.It, which is inputted, has clock signal clk, counts
Complete signal etu_done, position count signal bit_cnt, and data-signal tx_data [8 to be sent:0]；Output has frame
Sequence signal frm_seq and state control signal.
Data frame format is sent as defined in the 14443 Type-A agreements according to Fig. 2, frame sequence is by frame head SOC（1
bit）, postamble EOC（2 bit）And n data cell to be sent（8bit data bit adds 1bit parity bits, 9 altogether
bit）Composition.Therefore, the function of frame sequence maker realization is：Controlled by internal state machine, in n data cell to be sent
Front and back add frame head SOC and postamble EOC respectively, complete framing operation, while frame sequence is completed by parallel-to-serial converter
Arrange frm_seq Serial output.
One bit digit counters 2, its input signal are the state control letter that clk, etu_done and frame sequence maker export
Number.It realize function be：The frame sequence frm_seq of transmission bit positions are counted, produce position count signal bit_cnt,
For the displacement Serial output redirected with parallel-to-serial converter of the state machine inside control frame sequence generator.
One modified Miller code encoder 4, its input signal are that clk, clk_cnt, frm_seq and frame sequence maker export
State control signal, output signal tx_code.
As shown in figure 3, modified Miller code defines 3 kinds of coded sequences, i.e. Sequency X, Sequency Y and
Sequency Z, wherein X and Z have modulation " groove "（Width is t1）.Therefore, decoder internal devises two registers, i.e.,
Groove starts register and groove end register, for carving at the beginning of to groove（tx）And finish time（tx+t1）Carry out
Control, realize the adjustable of recess width.
Frame head SOC only has a bit, is encoded to Sequency Z.Postamble EOC has 2 bit, first bit to be fixed as
" 0 ", second bit are encoded to Sequency Y.Other bit coded system is in frame sequence：Logical one is encoded to
Sequency X；The coding of logical zero is divided into two kinds of situations, if a upper bit of current " 0 " is " 1 ", then this " 0 "
Just it is encoded to Sequency Y；A upper bit of current if " 0 " is also " 0 ", then current this " 0 " is just encoded to
Sequency Z.Therefore, a register tx_lastbit is also add in decoder internal, for recording bit positions to be sent
A upper bit position value, to determine that the coding of current " 0 " to be sent is to use Sequency Y or use
Sequency Z。
The present invention is described in detail above by embodiment, but these are not formed to the present invention's
Limitation.Without departing from the principles of the present invention, those skilled in the art can also make many modification and improvement, these
It should be regarded as protection scope of the present invention.
Claims (3)
- A kind of 1. 14443Type-A transmitting coding circuits for supporting 4 kinds of communication speeds, it is characterised in that including：One programmable clock counter, for 4 kinds of rate modes such as 106Kbps, 212Kbps, 424Kbps and 848Kbps, difference Realize 4 kinds of corresponding clock counts；One frame sequence maker, inside include state machine and parallel-to-serial converter, the hair according to as defined in 14443 Type-A agreements Data frame format is sent, frame head SOC and postamble EOC, Serial output are added respectively in the front and back of parallel data to be sent Frame sequence；One bit digit counters, the bit positions of the frame sequence of transmission are counted, bit positions count signal is produced, for control frame The displacement Serial output redirected with parallel-to-serial converter of state machine inside sequence generator；One modified Miller code encoder, according to the coded format of modified Miller code, produce Encoded output signal tx_code.
- 2. transmitting coding circuit as claimed in claim 1, it is characterised in that：The programmable clock counter, indoor design One etu length register, according to 4 kinds of rate modes such as 106Kbps, 212Kbps, 424Kbps and 848Kbps, etu length The value of register can be configured to 127,63,31 and 15 accordingly, when can thus realize 128 clock counts or 64 Clock counts or 32 clock counts, or 16 clock counts, it is achieved thereby that the support to 4 kinds of communication speeds.
- 3. transmitting coding circuit as claimed in claim 1, it is characterised in that：The modified Miller code encoder, indoor design Two registers, i.e. groove start register and groove end register, for carving at the beginning of to coded sequence further groove It is controlled with finish time, realizes the adjustable of recess width, in addition, decoder internal also add a register, For recording the value of a upper bit position for bit positions to be sent, to determine that the coding of current logical zero to be sent is to use Sequency Y still use Sequency Z.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710877765.7A CN107465418A (en) | 2017-09-26 | 2017-09-26 | A kind of 14443Type A transmitting coding circuits for supporting 4 kinds of communication speeds |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710877765.7A CN107465418A (en) | 2017-09-26 | 2017-09-26 | A kind of 14443Type A transmitting coding circuits for supporting 4 kinds of communication speeds |
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| Publication Number | Publication Date |
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| CN107465418A true CN107465418A (en) | 2017-12-12 |
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| CN201710877765.7A Pending CN107465418A (en) | 2017-09-26 | 2017-09-26 | A kind of 14443Type A transmitting coding circuits for supporting 4 kinds of communication speeds |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112291170A (en) * | 2020-11-17 | 2021-01-29 | 四川科道芯国智能技术股份有限公司 | Improved Miller code decoding method, device and equipment |
-
2017
- 2017-09-26 CN CN201710877765.7A patent/CN107465418A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112291170A (en) * | 2020-11-17 | 2021-01-29 | 四川科道芯国智能技术股份有限公司 | Improved Miller code decoding method, device and equipment |
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| PB01 | Publication | ||
| PB01 | Publication | ||
| WD01 | Invention patent application deemed withdrawn after publication |
Application publication date: 20171212 |
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| WD01 | Invention patent application deemed withdrawn after publication |