CN112631967B - High-capacity TF-SIM card and communication method thereof - Google Patents
High-capacity TF-SIM card and communication method thereof Download PDFInfo
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- CN112631967B CN112631967B CN202011505174.5A CN202011505174A CN112631967B CN 112631967 B CN112631967 B CN 112631967B CN 202011505174 A CN202011505174 A CN 202011505174A CN 112631967 B CN112631967 B CN 112631967B
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- 238000004891 communication Methods 0.000 title claims abstract description 94
- 238000000034 method Methods 0.000 title claims abstract description 12
- 238000013500 data storage Methods 0.000 claims abstract description 13
- 230000006870 function Effects 0.000 claims description 19
- 230000003139 buffering effect Effects 0.000 claims description 4
- 239000000758 substrate Substances 0.000 claims description 4
- 238000012545 processing Methods 0.000 abstract description 5
- 230000003993 interaction Effects 0.000 abstract 1
- 230000005540 biological transmission Effects 0.000 description 5
- 230000007547 defect Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
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- 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
- G06F13/14—Handling requests for interconnection or transfer
- G06F13/20—Handling requests for interconnection or transfer for access to input/output bus
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- 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
- G06F13/42—Bus transfer protocol, e.g. handshake; Synchronisation
- G06F13/4282—Bus transfer protocol, e.g. handshake; Synchronisation on a serial bus, e.g. I2C bus, SPI bus
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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
- H04B1/38—Transceivers, i.e. devices in which transmitter and receiver form a structural unit and in which at least one part is used for functions of transmitting and receiving
- H04B1/3816—Mechanical arrangements for accommodating identification devices, e.g. cards or chips; with connectors for programming identification devices
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W8/00—Network data management
- H04W8/18—Processing of user or subscriber data, e.g. subscribed services, user preferences or user profiles; Transfer of user or subscriber data
- H04W8/183—Processing at user equipment or user record carrier
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- Engineering & Computer Science (AREA)
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- General Engineering & Computer Science (AREA)
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- Mobile Radio Communication Systems (AREA)
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Abstract
The invention discloses a high-capacity TF-SIM card and a communication method thereof. The high-capacity TF-SIM card comprises a TF unit and a SIM unit. The TF unit performs high-speed data communication with the mobile phone and performs data storage; the SIM unit performs telecommunication communication with the mobile phone, and the SE function performs security operations such as encryption and decryption. The TF unit and the SIM unit are communicated through an SPI interface and a GPIO parallel port. The SIM chip has no standard parallel port, and the invention adopts GPIO to simulate the parallel port, thereby improving the communication speed of the TF unit and the SIM unit. The SPI interface is used for command and state interaction between the TF unit and the SIM unit, and can also realize low-speed or non-real-time data processing such as identity authentication by relying on the SE function of the SIM unit. GPIO parallel port realizes high-speed data communication, and SE of SIM unit realizes high-speed and real-time data encryption and decryption processing for TF unit data. The invention aims to improve the communication speed between the TF unit and the SIM unit, and realizes the identity authentication function by utilizing the SE of the SIM, and also carries out the encryption and decryption operation on the data of the mobile phone and the TF unit in real time.
Description
Technical Field
The invention discloses a high-capacity TF-SIM card and a communication method thereof, belonging to the technical field of intelligent cards.
Background
The high-capacity TF-SIM card consists of a TF unit and an SIM unit, which are sealed together on a circuit substrate, and the TF unit and the SIM unit are connected through a certain communication interface. The TF unit is responsible for high-Speed data communication with the cell phone, and the TF card Read Speed of the Class 10 standard is at least 20MB/s, and the Write Speed is at least 10MB/s. The SIM unit is responsible for telecommunication communication with the mobile phone, and meanwhile, the SIM unit has a SE function and can carry out security operations such as encryption and decryption on data communicated by the TF interface. Generally, the SIM chip only has a low-speed communication interface, such as SPI and I2C, and cannot perform high-speed and real-time encryption and decryption operations on high-speed TF interface data, but only performs low-speed communication, such as identity authentication. The SIM unit low-speed communication interface limits the application area of high-capacity TF-SIM cards.
Aiming at the problems, the invention provides the high-capacity TF-SIM card and the communication method thereof, which improve the defect of low communication speed between the traditional TF unit and the SIM unit, so that the SIM unit can carry out real-time encryption and decryption safe operation on TF unit data, thereby expanding the application field of the high-capacity TF-SIM card.
Disclosure of Invention
The invention discloses a high-capacity TF-SIM card and a communication method thereof, which are characterized in that the communication is carried out by adopting a GPIO analog parallel port mode by improving the mode that only a low-speed SPI interface is used for communication between a TF unit and a SIM unit of the traditional high-capacity TF-SIM card, thereby improving the speed of data communication between the TF unit and the SIM unit, enabling the SE function of the SIM unit to carry out safe operations such as high-speed real-time encryption and decryption on data of the TF unit, and expanding the application field of the traditional high-capacity TF-SIM card.
A high-capacity TF-SIM card is composed of TF unit and SIM unit, which are sealed together on a circuit substrate. The TF unit is responsible for high-speed data communication with the mobile phone and data storage; the SIM unit is responsible for telecommunication communication with the mobile phone, and the SE function of the SIM unit can perform security operations such as data encryption and decryption; meanwhile, the main controller of the TF unit and the main controller of the SIM unit are communicated through an SPI interface and a GPIO analog parallel port. The traditional TF card only has the function of data storage, and the large-capacity TF-SIM card seals the TF card and the SIM card together, so that the SE function of the SIM unit can be fully utilized to carry out security operations such as encryption and decryption on data communicated by the TF interface.
The SPI interface is used for low-speed data communication when the large-capacity TF-SIM card works, and after the TF unit receives mobile phone data, the instruction, the state and related data can be sent to the SIM unit through the SPI interface, so that the SIM unit can carry out security operations such as encryption and decryption on the data sent by the TF unit master controller. Because of the speed limitation of the SPI interface, the SIM unit can only perform low-speed or non-real-time applications such as identity authentication.
Typically, the SIM unit master does not have a high-speed communication interface, but only has SPI, I2C, GPIO, etc. The invention realizes high-speed communication between the SIM unit and the TF unit by adopting a GPIO analog parallel port communication mode. In order to save GPIO resources, the invention adopts 8 GPIO lines as data interfaces, 2 GPIO lines as communication control, 1 GPIO line as state indication, and simultaneously utilizes SPI interfaces to transmit specific communication instructions, wherein GPIO control line 1 is used for controlling the TF unit to transmit data to the SIM unit, and GPIO control line 2 is used for controlling the SIM unit to transmit data to the TF unit.
Besides the function of data storage, the TF unit of the large-capacity TF-SIM card can also be used as a high-speed data communication bridge between the SIM unit and the mobile phone, the mobile phone firstly carries out high-speed communication with the TF unit, the TF unit master controller carries out mode judgment on data sent by the mobile phone, and the communication data modes are distinguished by file types, so that different data processing processes are carried out. The invention sets three file types:
the file type 1 is a TF traditional data storage type and is used for TF card data storage;
the file type 2 is a low-speed non-real-time data communication type and is used for low-speed SPI interface data communication between the TF unit and the SIM unit;
file type 3 is a high speed real-time communication type for high speed parallel data communication of TF unit and SIM unit.
When the mobile phone needs to carry out low-speed or non-real-time application such as identity authentication and the like on communication data, the mobile phone can send instructions and data to the TF interface through the file type 2, and the TF unit master controller forwards the data to the SIM unit through the SPI interface. And after the SE module of the SIM unit performs security operation processing such as encryption and decryption on the data, the data is returned to the TF unit through the SPI interface. And then the TF unit returns the data to the mobile phone or stores the encrypted data according to the protocol selection.
When the mobile phone needs to encrypt the communication data at high speed, the data can be sent to the TF card interface through the file type 3, and the TF unit master controller sends an instruction to the SIM unit through the SPI interface to start the GPIO analog parallel port to carry out data communication. The TF unit main controller firstly puts the received mobile phone data into a sending FIFO for caching, and then can communicate with the mobile phone and simultaneously forward the sending FIFO cached data to the SIM unit through a GPIO parallel port. After the SE module of the SIM unit encrypts and decrypts the data, the data can be returned to the TF unit through the GPIO analog parallel port, the TF unit firstly puts the encrypted and decrypted data into the receiving FIFO after receiving the encrypted and decrypted data, and then the TF unit returns the cached data of the receiving FIFO to the receiver or stores the data according to the protocol.
The GPIO parallel port between the TF unit and the SIM unit takes 8 GPIO lines as a data interface, 2 GPIO lines as communication control, 1 GPIO line as a state indication, and the SPI interface transmits an instruction to start the GPIO parallel port communication. When data is transferred from the TF unit to the SIM unit, the TF unit controller first writes the data to the GPIO parallel port, and then sets the GPIO control line 1 to a low level. After the SIM unit reads the GPIO parallel port data, the GPIO state line is set to be low level to be used as a received data indication, and at the moment, one-byte data transmission is completed. When data is transferred from the SIM unit to the TF unit, the SIM unit controller first writes the data to the GPIO parallel port, and then sets the GPIO control line 2 to a low level. After the TF unit reads the GPIO parallel port data, the GPIO state line is set to be low level to be used as a received data indication, and at the moment, one-byte data transmission is completed. That is, the transmission direction of the GPIO status line is determined by the data communication direction of the TF unit and the SIM unit.
The beneficial effects of the invention are as follows: by arranging the SPI interface and the GPIO analog parallel communication interface on the TF unit and the SIM unit, the SIM unit can be used for carrying out low-speed or non-real-time communication applications such as identity authentication and the like on the data of the TF interface, and can also be used for high-speed and real-time communication applications. The defect of low communication speed between the TF unit and the SIM unit of the traditional high-capacity TF-SIM card is overcome, and the application field of the high-capacity TF-SIM card is expanded.
Drawings
Fig. 1 is a schematic hardware structure diagram of a high-capacity TF-SIM card and a communication method thereof according to an embodiment of the present invention.
Fig. 2 is a schematic communication flow diagram of a high-capacity TF-SIM card and a communication method thereof according to an embodiment of the present invention.
Detailed Description
The embodiment of the invention provides a high-capacity TF-SIM card and a communication method thereof, wherein the hardware structure, the data communication mode and the communication flow of the high-capacity TF-SIM card are respectively and clearly and completely described by combining with the accompanying drawings so as to fully understand the design purposes, the characteristics and the effects:
a high-capacity TF-SIM card is composed of TF unit and SIM unit, which are sealed together on a circuit substrate, and the hardware structure is as shown in figure 1. The TF unit is responsible for high-speed data communication with the mobile phone and data storage; the SIM unit is responsible for telecommunication communication with the mobile phone, and the SE function of the SIM unit can perform security operations such as data encryption and decryption; meanwhile, the main controller of the TF unit and the main controller of the SIM unit are communicated through an SPI interface and a GPIO analog parallel port. The TF card unit is provided with two data buffer FIFOs for buffering data sent by the TF unit to the SIM unit and data received by the TF unit from the SIM unit.
The traditional TF card only has the function of data storage, and the large-capacity TF-SIM card seals the TF unit and the SIM unit together, so that the SE function of the SIM unit can be fully utilized to carry out security operations such as data encryption and decryption on the data communicated by the TF interface.
The SPI interface is used for low-speed data communication when the large-capacity TF-SIM card works, and after the TF unit receives host data, the command, the state and related data can be sent to the SIM unit through the SPI interface, so that the SE of the SIM unit can carry out security operations such as encryption and decryption on the data sent by the TF unit master controller. Because of the speed limitation of the SPI interface, the SIM unit can only perform low-speed or non-real-time applications such as identity authentication.
Typically, the SIM unit master does not have a high-speed communication interface, but only has SPI, I2C, GPIO, etc. The invention realizes high-speed communication between the SIM unit and the TF unit by adopting a GPIO analog parallel port communication mode. In order to save GPIO resources, the invention adopts 8 GPIO lines as data interfaces, 2 GPIO lines as communication control, 1 GPIO line as state indication, and simultaneously utilizes SPI interfaces to transmit specific communication instructions.
In order to fully utilize the SE function of the SIM unit to carry out data encryption and decryption and other security operations on the data communicated with the TF unit and the mobile phone, the invention improves the data communication mode of the TF unit and the mobile phone. The TF unit master controller judges the mode of the mobile phone data, distinguishes the communication data mode by the file type, and sets three file types:
the file type 1 is a TF traditional data storage type and is used for TF card data storage;
the file type 2 is a low-speed and non-real-time data communication type and is used for data communication between the TF unit and the low-speed SPI interface of the SIM unit;
file type 3 is a high speed real-time communication type for high speed parallel data communication of TF unit and SIM unit.
The data communication flow of the high-capacity TF-SIM card is as shown in FIG. 2:
1) For the traditional data storage function of the TF card, the mobile phone directly adopts the file type 1 to send data to the TF interface, and the TF unit controller stores the data to the internal memory of the TF unit after receiving the data;
2) For the low-speed and non-real-time data communication function, the mobile phone adopts the file type 2, firstly, data is sent to the TF interface, and after receiving the data, the TF unit controller forwards the data to the SIM unit through the SPI interface. At this time, the SIM unit may perform security operations such as encryption and decryption on the data according to the formulated communication protocol, and then return the processed data to the TF unit through the SPI interface. The TF unit returns the data to the mobile phone or stores the data in an internal memory according to a formulated communication protocol, so that the safety functions such as identity authentication and the like are realized;
3) For the high-speed real-time data communication function, the mobile phone adopts a file type 3, firstly, according to a formulated communication protocol, an instruction is sent to a TF interface to start data communication, and after receiving the instruction, a TF unit controller sends the instruction to a SIM unit by using an SPI interface to start data communication;
4) And the host computer adopts the file type 3 to send data to the TF interface for carrying out encryption and decryption processing on the real-time data. After receiving the data, the TF unit controller firstly caches the data into a transmission FIFO, and the TF unit can communicate with the SIM unit and also can communicate with a receiver normally by utilizing the FIFO cache. The TF unit controller transmits the FIFO data byte by byte to the GPIO parallel port, and then sets the GPIO control line 1 as low indication data transmission; when the SIM unit controller collects that the GPIO control line 1 is low, the GPIO parallel port data can be read, and meanwhile, the GPIO state line is set low to indicate that the data is read; when the TF unit controller collects that the GPIO state line is low, the next byte can be sent after recognizing that the communication is completed.
5) According to the established communication protocol, when the SIM unit receives and completes one frame of data, the SE is utilized to carry out security operations such as encryption and the like on the frame of data, and then the ciphertext data is sent to the TF unit through the parallel port. The SIM unit controller sends data to the GPIO parallel port, sets the GPIO control line 2 low, stops data sending after the TF unit controller detects that the GPIO control line 2 is low, and then enters a data receiving state; and then reading GPIO parallel port data and setting the GPIO state line low. After the SIM unit detects that the GPIO status line is set low, the byte data communication is completed, and the next byte data communication can be performed. After receiving the ciphertext data, the TF unit stores the data in the TF memory or returns the data to the host according to the communication protocol.
The above description is only one specific application embodiment of the high-capacity TF-SIM card and the communication method thereof, and is not intended to limit the present invention, but any modifications, equivalents, and improvements made within the spirit and principles of the present invention are intended to be included in the scope of the present invention.
Claims (5)
1. The high-capacity TF-SIM card is characterized by comprising a TF unit and an SIM unit, which are jointly sealed to a circuit substrate, wherein the SIM unit has a telecommunication function and also has a SE function; the two units are communicated through SPI interface and GPIO parallel port connection, and communication control and state indication are carried out through GPIO; the TF unit is responsible for high-speed data communication with the mobile phone and data storage; the SIM unit is responsible for telecommunication communication with the mobile phone, and the SE function of the SIM unit can carry out security operations such as encryption and decryption on the data of the TF unit; the TF unit master controller is provided with two data buffer FIFOs, which are used for buffering data communicated between the TF unit and the SIM unit, one is used for buffering data sent by the TF unit to the SIM unit, and the other is used for buffering data received by the TF unit.
2. The high capacity TF-SIM card according to claim 1, wherein the SE function of said SIM unit performs a non-real-time operation function, low-speed data communication, and identity authentication through an SPI interface; meanwhile, the SPI interface is also used for transmitting data such as control instructions, states and the like.
3. The high-capacity TF-SIM card according to claim 1, wherein high-speed data communication between the TF unit and the SIM unit is realized by GPIO parallel ports, so that operations such as real-time encryption and decryption are performed on data communicated between the TF unit and the mobile phone by using SE of the SIM unit.
4. A high capacity TF-SIM card according to claim 1, wherein said SIM unit implements high speed data communication with said TF unit through 8 GPIOs as 8-bit data bit wide channels, and uses 3 GPIOs for read and write communication control and status indication.
5. The method for the high-capacity TF-SIM card is based on the high-capacity TF-SIM card disclosed in claim 1, and is characterized in that data communication between a mobile phone and the TF unit is divided into three communication modes by using file types, wherein the file type 1 is a data storage communication type, and the TF unit receives data of the mobile phone and stores the data into an on-chip memory; the file type 2 is a low-speed data communication type, and the TF unit receives data of the mobile phone and then carries out low-speed communication with the SIM unit through an SPI interface; the file type 3 is a high-speed data communication type, and the TF unit receives the data of the mobile phone and then performs high-speed data communication with the SIM unit through the GPIO parallel port.
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| CN202011505174.5A CN112631967B (en) | 2020-12-18 | 2020-12-18 | High-capacity TF-SIM card and communication method thereof |
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| CN202011505174.5A CN112631967B (en) | 2020-12-18 | 2020-12-18 | High-capacity TF-SIM card and communication method thereof |
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| CN112631967B true CN112631967B (en) | 2023-12-26 |
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