CN216561813U - RFID chip supporting double protocols - Google Patents
RFID chip supporting double protocols Download PDFInfo
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- CN216561813U CN216561813U CN202123420032.1U CN202123420032U CN216561813U CN 216561813 U CN216561813 U CN 216561813U CN 202123420032 U CN202123420032 U CN 202123420032U CN 216561813 U CN216561813 U CN 216561813U
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Abstract
The application provides a RFID chip supporting dual protocols, including: the system comprises an RF module, a data storage module, a first protocol processing module and a second protocol processing module; the RF module is used for receiving a reading instruction and a writing instruction which are sent by external equipment supporting a first transmission protocol and are used for the first protocol processing module to respond; the first protocol processing module is used for reading data which accords with the first transmission protocol from the data storage module and sending the data to external equipment which supports the first transmission protocol through the RF module; the first protocol processing module is also used for receiving data sent by external equipment supporting a first transmission protocol through the RF module and writing the data into the data storage module; and the second protocol processing module is used for reading the data which conforms to the second transmission protocol from the data storage module and sending the data to the external equipment which supports the second transmission protocol through the RF module. The method and the device can fully utilize the advantages of different communication protocols and meet the application requirements of different communication protocols.
Description
Technical Field
The application relates to the technical field of radio frequency identification, in particular to an RFID chip supporting double protocols.
Background
In the field of Radio Frequency Identification (RFID), different communication protocols cannot communicate with each other in the same radio frequency band. For example, a reader/writer device compliant with the ISO18000-6C communication protocol cannot read a tag compliant with the ISO10374 communication protocol. With the development of applications based on RFID technology, RFID systems conforming to a single communication protocol have been unable to meet the needs of some applications. To this end, the application proposes an RFID chip supporting dual protocols.
Disclosure of Invention
The present application is directed to solve the above problems, and an object of the present application is to provide an RFID chip supporting dual protocols and a data processing method thereof.
In a first aspect, the present application provides an RFID chip supporting dual protocols, the RFID chip including an RF module, a data storage module, and a first protocol processing module and a second protocol processing module connected between the RF module and the data storage module;
the RF module is configured to receive a read instruction and a write instruction sent by an external device supporting a first transmission protocol, so that the first protocol processing module can respond to the read instruction and the write instruction;
the first protocol processing module is configured to read data conforming to the first transmission protocol from the data storage module and send the data to an external device supporting the first transmission protocol through the RF module;
the first protocol processing module is further configured to receive, through the RF module, data sent by an external device supporting the first transmission protocol, and write the data into the data storage module;
and the second protocol processing module is configured to read data conforming to a second transmission protocol from the data storage module and send the data to an external device supporting the second transmission protocol through the RF module.
According to the technical scheme provided by some embodiments of the present application, the RFID chip further includes a first SPI module; the first SPI module is connected with the first protocol processing module;
the first SPI module is configured to acquire data of the external device supporting the first transmission protocol and transmit the data to the first protocol processing module, so that the first protocol processing module writes the data into the data storage module.
According to the technical scheme provided by some embodiments of the present application, the RFID chip further includes a second SPI module; the second SPI module is connected with the data storage module;
the second SPI module is configured to receive and respond to an access request sent by an external device; and the external equipment reads the data in the data storage module through the second SPI module.
According to the technical scheme provided by some embodiments of the present application, the first transmission protocol is an ISO18000-6C communication protocol; the second transmission protocol is an ISO10374 communication protocol.
According to the technical scheme provided by certain embodiments of the application, the data storage module is an EEPROM memory.
According to the technical solution provided by some embodiments of the present application, the RF module includes a virtual power supply, a modulation circuit, and a demodulation circuit;
the virtual power supply is configured to extract energy of the radio frequency signal and provide energy for the RFID chip;
the modulation circuit is configured to perform radio frequency modulation on baseband data;
the demodulation circuit is configured to demodulate a read instruction and a write instruction sent by an external device.
According to the technical scheme provided by some embodiments of the present application, the first SPI module has an SPI interface for connecting with an external device; the RF module can supply power to an external device through the first SPI module.
According to the technical scheme provided by some embodiments of the application, the storage area of the data storage module comprises a UHF fixed data area and a user data area; the user data area comprises a first data area and a second data area;
the first data area is accessible to the first protocol processing module, the first SPI module and the second SPI module;
the second data area is accessible to the first protocol processing module, the second protocol processing module, the first SPI module, and the second SPI module.
According to the technical solutions provided in some embodiments of the present application, the memory sizes of the first data area and the second data area are equal.
In a second aspect, the present application provides a data processing method based on the above RFID chip supporting dual protocols, including the following steps:
circularly reading data conforming to a second transmission protocol from the data storage module through the second protocol processing module, and sending the data to an external device supporting the second transmission protocol through the RF module;
and detecting frame header data through the first protocol processing module, controlling the second protocol processing module to stop sending data to external equipment when the detected frame header data is judged to be matched with preset data, and responding to the received reading instruction and writing instruction sent by the external equipment supporting the first transmission protocol through the first protocol processing module.
Compared with the prior art, the beneficial effect of this application: according to the RFID chip supporting the double protocols, the tags meeting the first transmission protocol and the second transmission protocol are integrated into one chip to form an RFID system supporting the two communication protocols, so that the advantages of different communication protocols can be fully utilized, and the application requirements of different communication protocols can be met.
The RFID chip supporting the double protocols is used for being compatible with an ISO10374 communication protocol in the existing railway vehicle number automatic identification system and can meet the basic functions of the ISO18000-6C communication protocol; on the basis of meeting the application of a label in a railway vehicle number automatic identification system, the universal wireless function is expanded, and meanwhile, an external sensor, such as a temperature sensor of an SPI (serial peripheral interface), can be connected in an expanding way through a first SPI (serial peripheral interface) module; the local device can access the storage area of the data storage module in the chip through the second SPI module, and the wireless read-write device can access the storage area of the data storage module in the chip in a wireless mode, so that interaction between the local device and the wireless read-write device is indirectly realized. The chip is applied to achieve the purposes of reducing power consumption, improving product stability, reducing hardware cost and reducing equipment volume, a new wireless protocol interface is expanded on the basis of the original railway label, the functions of an external sensor and a local access memory are expanded, and application scenes are enriched.
Drawings
Fig. 1 is a schematic block diagram of an RFID chip supporting dual protocols according to an embodiment of the present disclosure.
Detailed Description
The following detailed description of the present application is given for the purpose of enabling those skilled in the art to better understand the technical solutions of the present application, and the description in this section is only exemplary and explanatory, and should not be taken as limiting the scope of the present application in any way.
Referring to fig. 1, the present embodiment provides an RFID chip supporting dual protocols, which is manufactured by using a CMOS process, where the dual protocols refer to ISO18000-6C communication protocol and ISO10374 communication protocol.
The RFID chip supporting the dual protocol comprises: the system comprises an RF module, a data storage module, a first protocol processing module, a second protocol processing module, a first SPI module and a second SPI module; the RF module, the first SPI module and the data storage module are respectively connected with the first protocol processing module; the RF module and the data storage module are respectively connected with the second protocol processing module; the second SPI module is connected with the data storage module.
The RF module is an analog circuit module and mainly comprises a virtual power supply, a modulation circuit and a demodulation circuit; the virtual power supply is configured to extract energy of radio frequency signals and provide energy for the whole RFID chip, so that the chip can realize passive work and can provide electric energy for external equipment; the modulation circuit is configured to perform radio frequency modulation on baseband data; the demodulation circuit is configured to demodulate a reading instruction and a writing instruction sent by external reading and writing equipment; since the ISO18000-6C communication protocol and ISO10374 communication protocol are substantially identical over the radio frequency band, the module is shared by both protocols.
The RF module is configured to receive a read instruction and a write instruction sent by an external device supporting a first transmission protocol, so that the first protocol processing module can respond to the read instruction and the write instruction; and the data processing device is also configured to send the data which is read by the second transmission protocol and conforms to the second transmission protocol to an external device supporting the second transmission protocol.
The first protocol processing module is configured to read data conforming to the first transmission protocol from the data storage module and send the data to an external device supporting the first transmission protocol through the RF module; the first protocol processing module is further configured to receive, through the RF module, data sent by an external device supporting the first transmission protocol, and write the data into the data storage module.
Specifically, the first protocol processing module can decode the first transmission protocol, receive and decode a work command sent by the read-write device supporting the first transmission protocol, and perform related operations according to the work command; for example, reading or writing data to a data storage module; meanwhile, the module also comprises a logic judgment part, and when the complete frame header data of the first transmission protocol is received, a judgment signal is sent to the second transmission protocol to stop working.
And the second protocol processing module is configured to read data conforming to a second transmission protocol from the data storage module and send the data to an external device supporting the second transmission protocol through the RF module.
Specifically, the second protocol processing module may support a second transmission protocol, and is configured to send data conforming to the second transmission protocol to the RF module, so that the RF module sends the data to a reading device supporting the second transmission protocol through a wireless radio frequency signal to complete communication.
Wherein the first transmission protocol is an ISO18000-6C communication protocol; the second transmission protocol is an ISO10374 communication protocol.
The data storage module is an EEPROM memory, and is configured to store data and divide the data according to a fixed area, as shown in table 1, the storage area of the data storage module includes a UHF fixed data area (Kill password, Access password, CRC16, EPC, TID, and the like) and a user data area; the UHF (ultra high frequency) is a radio wave with the wavelength range of 1 m-1 dm and the frequency of 300-3000 MHz, is commonly used in the fields of mobile communication and broadcast television, and the frequency range of the chip is 860-960 MHz; the user data area comprises a first data area and a second data area; the memory size of the first data area is equal to that of the second data area; the size of the user data area is 8Kbits, wherein the first 128 blocks (4Kbits) can be accessed by the first protocol processing module, the second 128 blocks have the block serial number of 128-255, both the first protocol processing module and the second protocol processing module can be accessed, namely, the first protocol processing module can access all 8K user data areas, and the second protocol processing module can only access the rear half space.
TABLE 1
Furthermore, the RFID chip further comprises a first SPI module and a second SPI module, and the application scenes of the chip are increased due to the addition of the first SPI module and the second SPI module.
The first SPI module is connected with the first protocol processing module; the first SPI module is configured to acquire data of the external device supporting the first transmission protocol and transmit the data to the first protocol processing module, so that the first protocol processing module writes the data into the data storage module; the first SPI module is provided with an SPI interface used for connecting with external equipment; the RF module can supply power to external equipment through the first SPI module; the first SPI module may access the entire user data area of the data storage module, i.e., both the first data area and the second data area.
Specifically, the first SPI module may be connected to an external sensor having an SPI interface in an extended manner. On one hand, the chip can supply power to the sensor, and the electric energy of the chip comes from a virtual power supply provided by the RF module, so that the passive work of the sensor is realized; on the other hand, according to the special command analyzed by the first protocol processing module, data interaction can be performed with an external sensor through the SPI, so that sensor data is obtained and transmitted to the read-write equipment supporting the first transmission protocol in a wireless mode, and wireless reading of the sensor data is achieved.
The second SPI module is connected with the data storage module; the second SPI module is configured to receive and respond to an access request sent by an external device; the external equipment reads the data in the data storage module through the second SPI module; the second SPI module may access the entire user data area of the data storage module, i.e., both the first data area and the second data area.
Specifically, the second SPI module may support the local SPI device to read and write the data storage module, and support local access to the data storage, so that the local device and the wireless read and write device may share the data storage, and the interaction between the local device and the wireless read and write device is indirectly achieved by reading and writing the shared data storage.
The RFID chip supporting the dual protocols provided by the embodiment is divided into a passive state and an active state when in use; where the passive case is where the second SPI mode is not connected to an external device.
(1) Working process under passive condition
Under the passive condition, after the power supply voltage of the carrier energy output chip is collected by the RF module and reaches a working threshold, the second protocol processing module circularly reads 4Kbits of a user data area and serializes the data, the data is sent according to bits from high to low from the highest bit of the lowest address byte of the area, then one is added to the address, the data is turned to adjacent bytes and sent again from high bit to low bit, a low level of 12.5 microseconds is generated when the bit value is 0, a high level of 12.5 microseconds is generated when the bit value is 1, and the data flow is sent all the time circularly by the second protocol processing module as long as radio frequency excitation exists.
When the second protocol processing module circularly reads data conforming to a second transmission protocol from the data storage module and sends the data to external equipment supporting the second transmission protocol through the RF module, the first protocol processing module synchronously detects frame header data and judges whether the frame header data is matched with preset data, if the frame header data is matched with the preset data, the first protocol processing module receives complete frame header information, the second protocol processing module is closed at the moment, the second protocol processing module stops sending the data to the external equipment, at the moment, the chip completely supports the first transmission protocol, and the first protocol processing module responds to a received reading instruction and a writing instruction sent by the external equipment supporting the first transmission protocol.
Meanwhile, when the first protocol processing module receives a special command, data interaction can be performed with an external sensor through an SPI interface provided by the first SPI mode, so that sensor data is obtained and transmitted to a read-write device supporting a first transmission protocol in a wireless mode, and wireless reading of the sensor data is achieved.
(2) Working process under active condition
Under the active condition, after the chip is powered on, the second protocol processing module circularly reads 4Kbits data behind the user data area and serializes the data, the data are sent from the highest bit of the lowest address byte in the area from high to low according to the bit, then one is added to the address, the data are turned to adjacent bytes and sent from the high bit to the low bit again, a low level of 12.5 microseconds is generated when the bit value is 0, a high level of 12.5 microseconds is generated when the bit value is 1, and the data flow can be sent by the second protocol processing module circularly all the time as long as radio frequency excitation exists.
When the second protocol processing module circularly reads data conforming to a second transmission protocol from the data storage module and sends the data to an external device supporting the second transmission protocol through the RF module, the first protocol processing module synchronously detects frame header data and judges whether the frame header data is matched with preset data, if the frame header data is matched with the preset data, the first protocol processing module receives complete frame header information, the second protocol processing module is closed, the second protocol processing module stops sending the data to the external device, at the moment, the chip completely supports the first transmission protocol, and the first protocol processing module responds to received reading instructions and writing instructions sent by the external device supporting the first transmission protocol.
Meanwhile, when the first protocol processing module receives a special command, data interaction can be performed with an external sensor through an SPI interface provided by the first SPI mode, so that sensor data is obtained and transmitted to a read-write device supporting a first transmission protocol in a wireless mode, and wireless reading of the sensor data is achieved.
In addition, the first protocol processing module is further configured to monitor a chip selection signal of the second SPI module, and when the chip selection signal is valid, the first protocol processing module and the second protocol processing module are closed, and at this time, the local device can read and write the data storage area of the data storage module through the second SPI module, and when the chip selection signal is invalid, the initial state of the chip when the chip is powered on is restored.
The RFID chip supporting the double protocols is used for being compatible with an ISO10374 communication protocol in the existing railway vehicle number automatic identification system and can meet the basic functions of the ISO18000-6C communication protocol; on the basis of meeting the application of a label in a railway vehicle number automatic identification system, the universal wireless function is expanded, and meanwhile, an external sensor, such as a temperature sensor of an SPI (serial peripheral interface), can be connected in an expanding way through a first SPI (serial peripheral interface) module; the local device can access the storage area of the data storage module in the chip through the second SPI module, and the wireless read-write device can access the storage area of the data storage module in the chip in a wireless mode, so that interaction between the local device and the wireless read-write device is indirectly realized. The chip is applied to achieve the purposes of reducing power consumption, improving product stability, reducing hardware cost and reducing equipment volume, a new wireless protocol interface is expanded on the basis of the original railway label, the functions of an external sensor and a local access memory are expanded, and application scenes are enriched.
The principles and embodiments of the present application are explained herein using specific examples, which are provided only to help understand the method and the core idea of the present application. The foregoing is only a preferred embodiment of the present application, and it should be noted that there are no specific structures which are objectively limitless due to the limited character expressions, and it will be apparent to those skilled in the art that a plurality of modifications, decorations or changes can be made without departing from the principle of the present invention, and the technical features mentioned above can be combined in a suitable manner; such modifications, variations, combinations, or adaptations of the invention in other instances, which may or may not be practiced, are intended to be within the scope of the present application.
Claims (9)
1. An RFID chip supporting dual protocols, comprising: the system comprises an RF module, a data storage module, a first protocol processing module and a second protocol processing module, wherein the first protocol processing module and the second protocol processing module are connected between the RF module and the data storage module;
the RF module is configured to receive a read instruction and a write instruction sent by an external device supporting a first transmission protocol, so that the first protocol processing module can respond to the read instruction and the write instruction;
the first protocol processing module is configured to read data conforming to the first transmission protocol from the data storage module and send the data to an external device supporting the first transmission protocol through the RF module;
the first protocol processing module is further configured to receive, through the RF module, data sent by an external device supporting the first transmission protocol, and write the data into the data storage module;
and the second protocol processing module is configured to read data conforming to a second transmission protocol from the data storage module and send the data to an external device supporting the second transmission protocol through the RF module.
2. The dual protocol enabled RFID chip of claim 1, wherein the RFID chip further comprises a first SPI module; the first SPI module is connected with the first protocol processing module;
the first SPI module is configured to acquire data of the external device supporting the first transmission protocol and transmit the data to the first protocol processing module, so that the first protocol processing module writes the data into the data storage module.
3. The dual protocol enabled RFID chip of claim 2, wherein the RFID chip further comprises a second SPI module; the second SPI module is connected with the data storage module;
the second SPI module is configured to receive and respond to an access request sent by an external device; and the external equipment reads the data in the data storage module through the second SPI module.
4. The dual-protocol-capable RFID chip of claim 1, wherein the first transmission protocol is an ISO18000-6C communication protocol; the second transmission protocol is an ISO10374 communication protocol.
5. The dual-protocol-capable RFID chip of claim 1, wherein the data storage module is an EEPROM memory.
6. The dual-protocol-enabled RFID chip of claim 1, wherein the RF module comprises a virtual power supply, a modulation circuit, and a demodulation circuit;
the virtual power supply is configured to extract energy of the radio frequency signal and provide energy for the RFID chip;
the modulation circuit is configured to perform radio frequency modulation on baseband data;
the demodulation circuit is configured to demodulate a read instruction and a write instruction sent by an external device.
7. The dual-protocol-capable RFID chip of claim 2, wherein the first SPI module has an SPI interface for connection with an external device; the RF module can supply power to an external device through the first SPI module.
8. The dual-protocol-capable RFID chip of claim 3, wherein the storage area of the data storage module comprises a UHF fixed data area and a user data area; the user data area comprises a first data area and a second data area;
the first data area is accessible to the first protocol processing module, the first SPI module and the second SPI module;
the second data area is accessible to the first protocol processing module, the second protocol processing module, the first SPI module, and the second SPI module.
9. The dual-protocol-capable RFID chip of claim 8, wherein the memory size of the first data area and the second data area is equal.
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| CN202123420032.1U CN216561813U (en) | 2021-12-30 | 2021-12-30 | RFID chip supporting double protocols |
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| CN202123420032.1U CN216561813U (en) | 2021-12-30 | 2021-12-30 | RFID chip supporting double protocols |
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