CN112631967A - 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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- CN112631967A CN112631967A CN202011505174.5A CN202011505174A CN112631967A CN 112631967 A CN112631967 A CN 112631967A CN 202011505174 A CN202011505174 A CN 202011505174A CN 112631967 A CN112631967 A CN 112631967A
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- 238000013500 data storage Methods 0.000 claims description 10
- 230000003139 buffering effect Effects 0.000 claims description 5
- 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 7
- 238000004088 simulation Methods 0.000 description 6
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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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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 is in high-speed data communication with the mobile phone and stores data; the SIM unit is in telecommunication communication with the mobile phone, and the SE function of the SIM unit performs security operations such as encryption and decryption. And the TF unit and the SIM unit communicate 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 is limited by the speed of the SPI, 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 and the like by depending on the SE function of the SIM unit. And the GPIO parallel port realizes high-speed data communication, and the SE of the SIM unit realizes high-speed and real-time data encryption and decryption processing on the data of the TF unit. The invention aims to improve the communication speed between the TF unit and the SIM unit, realize the identity authentication function by using the SE of the SIM, and perform real-time encryption and decryption operation on data of the mobile phone and the TF unit.
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 to a circuit substrate, and the TF unit is connected with the SIM unit through a certain communication interface. The TF unit is responsible for high-Speed data communication with the mobile phone, and the Class 10 standard TF card Read Speed is at least 20MB/s, and the Write Speed is at least 10 MB/s. The SIM unit is responsible for carrying out telecommunication communication with the mobile phone, and simultaneously the SIM unit has an SE function and can carry out security operations such as encryption and decryption on data communicated by the TF interface. Usually, the SIM chip only has low-speed communication interfaces, such as SPI and I2C, and cannot perform high-speed and real-time encryption and decryption operations on high-speed TF interface data, but can only perform low-speed communication, such as identity authentication. The application field of the high-capacity TF-SIM card is limited by the low-speed communication interface of the SIM unit.
Aiming at the problems, the invention provides the high-capacity TF-SIM card and the communication method thereof, which overcome 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 safety operation on the data of the TF unit, 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 improve the communication mode between a TF unit and an SIM unit of the traditional high-capacity TF-SIM card only by a low-speed SPI interface and adopt the mode of GPIO simulation parallel port to carry out communication, thereby improving the speed of data communication between the TF unit and the SIM unit, leading the SE function of the SIM unit to carry out safety operations such as high-speed real-time encryption and decryption and the like on the data of the TF unit, and further expanding the application field of the traditional high-capacity TF-SIM card.
A large-capacity TF-SIM card is composed of a TF unit and an SIM unit, which are sealed together on a circuit substrate. The TF unit is responsible for carrying out high-speed data communication with the mobile phone and storing data; the SIM unit is responsible for carrying out telecommunication communication with the mobile phone, and the SE function of the SIM unit can carry out security operations such as data encryption and decryption; and meanwhile, the main controller of the TF unit communicates with the main controller of the SIM unit through an SPI interface and a GPIO simulation parallel port. The traditional TF card only has a data storage function, and the TF card and the SIM card are sealed by the high-capacity TF-SIM card, so that the SE function of the SIM unit can be fully utilized to perform security operations such as encryption and decryption on data communicated by the TF interface.
When the large-capacity TF-SIM card works, the SPI interface is responsible for low-speed data communication, and after the TF unit receives data of a mobile phone, the TF unit can send instructions, states and related data to the SIM unit through the SPI interface, so that the SIM unit can perform security operations such as encryption and decryption on the data sent by the TF unit main controller. Due to the speed limitation of the SPI interface, the SIM unit can only perform low-speed or non-real-time applications such as identity authentication.
Usually, the SIM unit master does not have a high-speed communication interface, but only interfaces such as 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 and 1 GPIO line as state indication, and simultaneously utilizes the SPI interface to transmit specific communication instructions, wherein a GPIO control line 1 is used for controlling the TF unit to transmit data to the SIM unit, and a middle GPIO control line 2 is used for controlling the SIM unit to transmit data to the TF unit.
Besides the data storage function, 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 main 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;
the file type 3 is a high-speed real-time communication type and is used for high-speed parallel port data communication between the TF unit and the SIM unit.
The communication between the mobile phone and the TF interface needs to establish a communication protocol, when the mobile phone needs to perform low-speed or non-real-time application such as identity authentication on communication data, instructions and data can be sent to the TF interface through the file type 2, and the TF unit main 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 are 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 a high speed, the data can be sent to the TF card interface through the file type 3, the TF unit main controller sends an instruction to the SIM unit through the SPI interface, and the GPIO simulation parallel port is started for data communication. The TF unit main controller firstly puts the received mobile phone data into the transmission FIFO for caching, and then can forward the transmission FIFO cache data to the SIM unit through the GPIO parallel port while communicating with the mobile phone. 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 simulation parallel port, after the TF unit receives the encrypted and decrypted data, the data is firstly put into a receiving FIFO, and then the TF unit selects to return the receiving FIFO buffer data to a receiver or store the data according to a protocol.
GPIO parallel port between TF unit and the SIM unit is as data interface by 8 GPIO lines, and 2 GPIO lines are as communication control, and 1 GPIO line is as state indication, starts GPIO parallel port communication by SPI interface transmission instruction. When data is transmitted to the SIM unit by the TF unit, the TF unit controller firstly writes the data into the GPIO parallel port, and then sets the GPIO control line 1 to be low level. And after the SIM unit reads the GPIO parallel port data, setting the GPIO state line to be low level as a received data indication, and finishing the transmission of one byte of data. When data is transmitted 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. And after reading the GPIO parallel port data, the TF unit sets the GPIO state line to be low level as a received data indication, and at the moment, one byte of data transmission is finished. 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 invention has the beneficial effects that: through setting up SPI, GPIO simulation parallel communication interface's two kinds of interfaces mode in TF unit and SIM unit, not only can carry out low-speed or non-real-time communication application such as authentication to the data of TF interface with SIM unit, can also carry out the application of high-speed, real-time communication. 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 therefore the application field of the high-capacity TF-SIM card is expanded.
Drawings
Fig. 1 is a schematic diagram of a high-capacity TF-SIM card and a hardware structure of a communication method thereof according to an embodiment of the present invention.
Fig. 2 is a 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 clearly and completely described in the following steps in combination with the accompanying drawings so as to fully understand the design purpose, characteristics and effects:
a high-capacity TF-SIM card is composed of a TF unit and an SIM unit, which are sealed together on a circuit substrate, and has a hardware structure shown in figure 1. The TF unit is responsible for carrying out high-speed data communication with the mobile phone and storing data; the SIM unit is responsible for carrying out telecommunication communication with the mobile phone, and the SE function of the SIM unit can carry out security operations such as data encryption and decryption; and meanwhile, the main controller of the TF unit communicates with the main controller of the SIM unit through an SPI interface and a GPIO simulation parallel port. The TF card unit is provided with two data buffer FIFOs which are respectively used 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 a data storage function, and the 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 perform security operations such as data encryption and decryption on data communicated by the TF interface.
When the large-capacity TF-SIM card works, the SPI interface is responsible for low-speed data communication, and after the TF unit receives host data, the TF unit can send instructions, states and related data to the SIM unit through the SPI interface, so that safe operations such as encryption and decryption can be performed on the data sent by the TF unit main controller through the SE of the SIM unit. Due to the speed limitation of the SPI interface, the SIM unit can only perform low-speed or non-real-time applications such as identity authentication.
Usually, the SIM unit master does not have a high-speed communication interface, but only interfaces such as 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 utilizes the SPI interface 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 data communicated by 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 main 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 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;
the file type 3 is a high-speed real-time communication type and is used for high-speed parallel port data communication between the TF unit and the SIM unit.
The data communication flow of the high-capacity TF-SIM card is as shown in figure 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 into an internal storage of the TF unit after receiving the data;
2) for the low-speed and non-real-time data communication function, the mobile phone adopts a file type 2, firstly, data is sent to the TF interface, and after the TF unit controller receives the data, the data is forwarded to the SIM unit through the SPI interface. At this time, the SIM unit may perform security operations such as encryption and decryption on data according to a specified communication protocol, and then return the processed data to the TF unit through the SPI interface. The TF unit returns data to the mobile phone or stores the data in an internal memory according to a formulated communication protocol, so that safety functions such as identity authentication are realized;
3) for the high-speed real-time data communication function, the mobile phone adopts a file type 3, firstly, an instruction is sent to a TF interface to start data communication according to a formulated communication protocol, and after receiving the instruction, a TF unit controller sends the instruction to an SIM unit by using an SPI interface to start data communication;
4) the host computer adopts the file type 3 to send data to the TF interface to carry out real-time data encryption and decryption processing. After receiving the data, the TF unit controller firstly buffers the data into a transmission FIFO, and the TF unit can communicate with the SIM unit and can also communicate with the receiver for normal data by utilizing the FIFO buffer. The TF unit controller transmits FIFO data to the GPIO parallel port byte by byte, and then sets a GPIO control line 1 to transmit low indication data; when the SIM unit controller collects that the GPIO control line 1 is low, GPIO parallel port data can be read, and meanwhile, a GPIO state line is set to be low to indicate that the data is read; and when the TF unit controller acquires that the GPIO state line becomes low, the TF unit controller recognizes that the communication is completed and can transmit the next byte.
5) According to the established communication protocol, after the SIM unit receives a frame of data, the SE of the SIM unit is used for carrying out security operations such as encryption on the frame of data, and the like, 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, the GPIO control line 2 is set low, and when the TF unit controller detects that the GPIO control line 2 is low, the data sending is stopped, and the TF unit controller enters a data receiving state; and reading the GPIO parallel port data and setting the GPIO state line to be low. After the SIM unit detects that the GPIO state line is set low, the byte data communication is finished, and the next byte data communication can be carried out. And after receiving the ciphertext data, the TF unit stores the data into the TF memory or returns the data to the host according to the communication protocol.
The above description is only an example of a specific application of the high-capacity TF-SIM card and the communication method thereof, and is not intended to limit the present invention, and any modifications, equivalent substitutions, improvements, etc. made within the spirit and principle of the present invention should be included in the scope of the present invention.
Claims (7)
1. A 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 an SE function besides a telecommunication function; the two units are connected through an SPI interface and a GPIO parallel port to carry out communication, and carry out communication control and state indication through the GPIO.
2. A high-capacity TF-SIM card according to claim 1 wherein the TF unit is responsible for high-speed data communication with the handset and for data storage; the SIM unit is responsible for carrying out telecommunication communication with a mobile phone, and the SE function of the SIM unit can carry out security operations such as encryption and decryption on data of the TF unit.
3. A high capacity TF-SIM card according to claim 2 wherein the SE function of the SIM unit performs non-real time operation function, low speed data communication, identity authentication through SPI interface; meanwhile, the SPI interface is also used for transmitting data such as control commands, states and the like.
4. A high-capacity TF-SIM card according to claim 3, wherein the TF unit and the SIM unit realize the high-speed data communication between the mobile phone and the TF unit through GPIO parallel ports, so as to utilize SE of the SIM unit to perform real-time encryption and decryption and other operations on the data communicated between the TF unit and the mobile phone.
5. A high capacity TF-SIM card according to claim 4, wherein said SIM unit implements high speed data communication with said TF unit by using 8 GPIOs as 8 bit wide channels, and uses 3 GPIOs for read, write communication control and status indication.
6. A high-capacity TF-SIM card and communication method thereof according to claim 5, wherein said TF unit master is provided with two data buffering FIFOs for data buffering of said TF unit communicating with said SIM unit, one for buffering data sent by said TF unit to said SIM unit and the other for buffering data received by said TF unit to said SIM unit.
7. A high-capacity TF-SIM card communication method, a high-capacity TF-SIM card based on claim 1, characterized in that, the data communication between the mobile phone and the TF unit uses the file type to distinguish three communication modes, the file type 1 is the data storage communication type, the TF unit receives the data of the mobile phone and then stores the data in the 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 the SPI; the file type 3 is a high-speed data communication type, and the TF unit receives data of the mobile phone and then carries out high-speed data communication with the SIM unit through the GPIO parallel port.
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