WO2021128582A1 - Sim card with mass storage function, and control method therefor - Google Patents

Abstract

Disclosed are a SIM card with a mass storage function, and a control method therefor. The SIM card comprises: a two-in-one control chip for processing a telecommunication service command, carrying out SIM interface communication with an external terminal, controlling and managing a flash memory chip, transmitting data to be stored that is obtained by an SD interface of the external terminal to the flash memory chip, and carrying out SD interface communication with the external terminal; a SIM contact for being connected to an SIM interface of the external terminal and processing telecommunication service interactive communication; an SD contact, the SD contact being configured to be connected to the SD interface of the external terminal, so that interactive communication of data storage is generated between the external terminal and the two-in-one control chip; the flash memory chip for storing said data transmitted by the two-in-one control chip; and a substrate for bearing the two-in-one control chip, the SIM contact, the SD contact and the flash memory chip and enabling same to be electrically connected to each other. Compared with the prior art, the present solution can improve the production efficiency of large-capacity SIM cards.

Description

SIM card with large-capacity storage function and control method thereof Technical field

The present invention relates to the field of smart devices, in particular to a SIM card with a large-capacity storage function and a control method thereof.

Background technique

Smart devices such as mobile phones, as people's production and life tools, have penetrated into people's lives. There are two types of mobile phones on the market, one is to support Micro SD card expansion, and the other is not to support Micro SD card expansion. Supporting Micro In mobile phones with SD card expansion, a Micro SD card/SIM card two-in-one card slot is generally used, one card slot is used to place the SIM card, and the other card slot is used to place the Micro SD card, so as to meet the needs of mobile phone communication and memory expansion . The above design causes mobile phone users to either use the dual SIM card standby function and cannot perform memory expansion, or a single SIM card is standby and the other card slot is used for memory expansion. Therefore, simultaneously implementing the communication function of the SIM card and the memory expansion of the Micro SD card in a single card slot can significantly improve the user experience.

technical problem

In the prior art, the patent number is CN200620064756.3 and the patent named "Large Capacity SIM Card" discloses a large capacity SIM card. Its design principle is to introduce a highly integrated SIM card into the structure of the existing SIM card. MMC memory card structure, this memory card structure includes MMC controller, NAND FLASH controller and NAND FLASH storage unit. As shown in Figure 2 of the patent document, on the basis of SIM card 1, the MMC memory card structure is connected to form SIM card 2 (ie SIM card system). The MMC card storage structure in the comparison document integrates the memory chip and the control module. , NAND FLASH memory cells need to use special production processes (such as eflash). If they are integrated with other modules in a chip, it will reduce the production yield of the chip. Moreover, memory cells with a capacity of more than 1GB cannot be integrated into the chip.

Therefore, how to improve the structure of the existing large-capacity SIM card to facilitate the mass production of the large-capacity SIM card is very important.

Technical solutions

The main purpose of the present invention is to provide a SIM card with a large-capacity storage function, which aims to solve the technical problem of improving the structure of the existing large-capacity SIM card and facilitating the mass production of the large-capacity SIM card.

The present invention provides a SIM card with a large-capacity storage function, including:

Two-in-one control chip, used for telecommunications business command processing, SIM interface communication with external terminals, and control and management of flash memory chips, transfer the data to be stored obtained by the external terminal SD interface to the flash memory chips, and perform SD with external terminals Interface communication;

The SIM contact is used to connect to the SIM interface of an external terminal and handle the interactive communication of telecommunications services;

SD contact, used to connect the SD interface of the external terminal, so that the external terminal and the two-in-one control chip produce interactive communication of stored data;

Flash memory chip, used to store the data to be stored transmitted by the two-in-one control chip;

The substrate is used to carry the two-in-one control chip, the SIM contact, the SD contact and the flash memory chip, and make electrical connections between them.

Preferably, the two-in-one control chip includes:

CPU, used to run the firmware program, coordinate the operation of other functional modules according to the requirements of the firmware program;

ROM, used to store firmware programs;

Data storage, used to store SIM card key, PUK code, storage user phone number, short message, storage of key parameters used by SD card, program code and key used by SD card, among them, data storage includes EEPROM or MTP;

SIM interface controller, which is responsible for SIM interface communication and processing telecommunications business commands;

SD protocol controller, used for parsing the SD interface communication protocol, processing commands, receiving data from the host or returning the data required by the host;

The flash memory controller is used for the communication of the flash memory chip interface, realizes the flash memory chip reading, programming and erasing commands, and receives or sends data of the flash memory chip interface;

DMA data path controller, used to coordinate the data transmission between the SD interface and the flash chip interface, and optimize the internal data flow;

Dedicated algorithm module, used to implement the encryption algorithm used by the SIM card, the ECC data error correction algorithm used by the SD card, the management acceleration algorithm of the flash memory chip, and the encryption algorithm used by the encrypted SD card;

SIM interface, used to connect SIM contacts and communicate with external terminals via SIM interface;

SD interface, used to connect SD contacts for SD interface communication with external terminals;

The timeout timer is used to ensure that the CPU can respond to the command of the SD interface communication in time;

RAM is used to store variables used in programs, buffer user data, and store data.

Preferably, the flash memory controller, DMA data controller, SD protocol controller, RAM, dedicated algorithm module, ROM, SIM interface controller, and timeout timer are all electrically connected to the CPU;

The SD protocol controller is electrically connected to the SD interface;

The SIM interface controller is electrically connected to the SIM interface;

The SIM interface controller is electrically connected to the data storage;

The SD interface is electrically connected with the SD contact, and the SIM interface is electrically connected with the SIM contact.

Preferably, the dedicated algorithm module includes A3 and A8 encryption algorithms and a national secret algorithm, wherein the encryption algorithm is used for the SIM card, and the national secret algorithm is used for encrypting data used by the SIM card and the SD card.

Preferably, the SD interface version includes SD1.0, SD2.0, SD3.0, SD4.0, SD5.0, SD6.0 and SD7.0;

The SIM interface complies with the ISO/IEC 7816 protocol.

Preferably, the two-in-one control chip is provided with a SIM interface aluminum pad and an SD interface aluminum pad;

The SIM interface aluminum pad is electrically connected to the SIM contact;

The SD interface aluminum pad is electrically connected to the SD contact.

Preferably, the two-in-one control chip further includes: a power management module, a clock generation module, and a voltage detection module.

Preferably, the CPU, RAM, ROM, data memory module, power management module and clock generation module are all SIM card and SD card function multiplexing modules.

The present invention also provides a method for controlling a SIM card with a large-capacity storage function, including:

Determine whether the CPU is processing SD interface commands;

If yes, judge whether the CPU has received the SIM interface command;

If it is, the CPU interrupts the processing of the SD interface commands that require data transmission, and prioritizes the processing of the SIM interface commands.

Preferably, if it is, the CPU interrupts the processing of the SD interface command that requires data transmission, and after the step of processing the SIM interface command in priority, it includes:

For interrupted SD interface commands, call RAM for SD interface data buffering;

After the SD interface data is buffered, the timeout timer is started, and the timeout timer starts timing with the start time of the timeout timer as the first moment;

Real-time judging whether the time difference between the current moment and the first moment is greater than the preset time threshold;

If it is, the CPU suspends processing the SIM interface command and starts to process the SD interface command. After the CPU finishes processing the SD interface command, it will continue to process the SIM interface command.

Beneficial effect

The beneficial effect of the present invention is that since the functional module of the SIM card and the SD card two-in-one control chip is a multiplexing module that can not only meet the requirements of the SIM card, but also meet the requirements of the SD card, the chip area is saved and the cost is reduced. The two-in-one control chip occupies a smaller space in the limited physical space of the SIM card, and it is easier to achieve packaging and wiring, which is convenient for mass production of large-capacity SIM cards.

Description of the drawings

FIG. 1 is a schematic diagram of the first structure of a SIM card with a large-capacity storage function according to the present invention;

FIG. 2 is a first structural schematic diagram of a two-in-one control chip of a SIM card with a large-capacity storage function in FIG. 1;

3 is a schematic diagram of a second structure of a two-in-one control chip of a SIM card with a large-capacity storage function in FIG. 1;

4 is a flowchart of a first embodiment of a method for controlling a SIM card with a mass storage function;

Fig. 5 is a flowchart of a second embodiment of a method for controlling a SIM card with a mass storage function.

To

Label description:

1. Two-in-one control chip; 2. Flash memory chip; 3. SD contact; 4. SIM contact; 5. Substrate;

... 101. CPU; 102, ROM; 103, data memory; 104, SIM interface controller; 105, SD protocol controller; 106, flash memory controller; 107, DMA data path controller; 108, dedicated algorithm module; 109, SIM Interface; 110, SD interface; 111, timeout timer; 112, RAM;

... 113. SIM interface aluminum pad; 114, SD interface aluminum pad.

To

The realization of the objectives, functional characteristics and advantages of the present invention will be further described in conjunction with the embodiments and with reference to the accompanying drawings.

The best mode of the present invention

It should be understood that the specific embodiments described here are only used to explain the present invention, but not used to limit the present invention.

1, the present invention provides a SIM card with a large-capacity storage function, including:

Two-in-one control chip 1, used for telecommunications service command processing, SIM interface communication with an external terminal, and control and management of the flash memory chip 2, which transmits the data to be stored obtained by the SD interface of the external terminal to the flash memory chip 2, and communicates with the external The terminal carries on SD interface communication;

SIM contact 4, which is used to connect to the SIM interface of an external terminal to handle interactive communication of telecommunications services;

SD contact 3 is used to connect the SD interface of the external terminal, so that the external terminal and the two-in-one control chip 1 can generate interactive communication of stored data;

The flash memory chip 2 is used to store the to-be-stored data transmitted by the two-in-one control chip 1;

The substrate 5 is used to carry the two-in-one control chip 1, the SIM contact 4, the SD contact 3 and the flash memory chip 2, and make electrical connections between them.

... In the embodiment of the present invention, P1 to P8 are all SD contacts 3, and S1 to S6 are all SIM contacts 4. The SIM contact 4 and SD contact 3 are all packaged on the surface of the substrate 5. SD contact 3, SIM contact 4 and flash memory chip 2 are all electrically connected to the two-in-one control chip 1. The SD interface version includes SD1.0 , SD2.0, SD3.0, SD4.0, SD5.0, SD6.0 and SD7.0, the SIM interface follows the ISO/IEC 7816 protocol. The two-in-one control chip 1 is not only used for telecommunications service command processing, SIM interface communication with external terminals, but also for controlling and managing the flash memory chip 2, transmitting the data to be stored obtained by the external terminal SD interface to the flash memory chip 2, and The external terminal performs SD interface communication. The flash memory chip 2 is the main data storage medium. The stored data is managed by the two-in-one control chip 1, including writing data to the flash memory chip 2, reading data from the flash memory chip 2, and performing data on the flash memory chip 2. Formatting, etc. The storage capacity of the flash memory chip 2 can be customized according to customer needs, and the storage capacity ranges from 128M to 128G. Types of flash memory chips 2 include SLC (Single-Level Cell, single-level cell), MLC (Multi-Level Cell, multi-layer unit) and TLC (Trinary-Level Cell, three-layer unit). The two-in-one control chip 1, the SIM contact 4, the SD contact 3, and the flash memory chip 2 are all packaged on the substrate 5. After the substrate 5 is wired, an electrical connection is generated between them. When an external terminal communicates with a SIM card with a large-capacity storage function (hereinafter referred to as a large-capacity SIM card), external data enters the two-in-one control chip 1 from the SIM contact 4, and the SIM interface controller 104 parses the command and responds to the telecommunication service Command, with the cooperation of the CPU 101, the dedicated algorithm module 108 is started to process the data in the data memory 103, and the processed result is fed back to the external terminal, so as to realize the communication function of the external terminal. When the external terminal interacts with the large-capacity SIM card, the data to be stored enters the two-in-one control chip 1 from the SD contact 3, and the SD protocol controller 105 parses the command and directly responds to the command that does not require data transmission. For the transmitted command, the timeout timer 111 is started with the cooperation of the CPU 101, and the DMA data path controller 107 is started to buffer the obtained data to be stored in the RAM 112, and then the flash memory controller 106 and the dedicated algorithm module 108 are sent to the flash memory chip 2. Send operation commands to transfer the data to the flash memory chip 2, so as to realize the data storage of the external terminal to the large-capacity SIM card. If encrypted data is stored in the flash memory chip 2, a dedicated algorithm module 108 also needs to perform encryption and decryption processing on the data. The process for the external terminal to retrieve data from the large-capacity SIM card is opposite to the above process, so it will not be repeated here. Through the above setting, the control modules of the SIM card and the SD card are combined into one, which shortens the bus of the control module of the SIM card and the SD card, improves the response speed of the data interaction between the two, and improves the performance of the large-capacity SIM card. Since the functional module of the two-in-one control chip 1 is a multiplexing module that can not only meet the requirements of the SIM card, but also meet the requirements of the SD card, the chip area is saved, thereby reducing the cost. The two-in-one control chip occupies a smaller space in the limited physical space of the SIM card, and it is easier to achieve packaging and wiring, which is convenient for mass production of large-capacity SIM cards! In addition, through the above settings, a smart card has the communication function of SIM card and Micro SD card memory expansion function, so that after inserting a large-capacity SIM card in a single card slot of an external terminal, the communication function of the SIM card and the memory expansion function of the Micro SD card can be realized at the same time. The normal use of the SIM card also expands the mobile phone. External storage capacity. By analogy, for the dual-SIM dual-standby mobile phone card slot, this solution also expands the external storage capacity of the mobile phone and enhances the user's experience on the premise of satisfying the user's dual-sim dual-standby.

Referring to Figure 2, the two-in-one control chip 1 includes:

CPU101, used to run the firmware program, and coordinate the operation of other functional modules according to the requirements of the firmware program;

ROM102, used to store firmware programs;

The data memory 103 is used to store the SIM card key, the PUK code, the user phone number, the short message, the key parameters used by the SD card, the program code, and the key used by the SD card. The data memory 103 includes EEPROM or MTP;

The SIM interface controller 104 is used for communication with the SIM interface 109 and processing telecommunication service commands;

The SD protocol controller 105 is used for parsing the communication protocol of the SD interface 110, processing commands, receiving data sent by the host or returning data required by the host;

The flash memory controller 106 is used to be responsible for the communication of the flash memory chip interface, realize the read, program and erase commands of the flash memory chip 2, and receive or send data of the flash memory chip interface;

The DMA data path controller 107 is used to coordinate the data transmission between the SD interface 110 and the flash chip interface, and optimize the internal data flow;

The dedicated algorithm module 108 is used to implement the encryption algorithm used by the SIM card, the ECC data error correction algorithm used by the SD card, the management acceleration algorithm of the flash memory chip, and the encryption algorithm used by the encrypted SD card;

The SIM interface 109 is used to connect the SIM contacts and communicate with an external terminal through the SIM interface 109;

The SD interface 110 is used to connect the SD contacts and communicate with an external terminal through the SD interface 110;

The timeout timer 111 is used to ensure that the CPU 101 can respond to the commands communicated by the SD interface 110 in a timely manner;

RAM 112 is used to store variables used in programs, buffer user data, and store data.

In the embodiment of the present invention, the flash memory controller 106, the DMA data controller 107, the SD protocol controller 105, the RAM 112, the dedicated algorithm module 108, the ROM 102, the SIM interface controller 104, and the timeout timer 111 are all electrically connected to the CPU 101. The SD protocol controller 105 is electrically connected to the SD interface 110; the SIM interface controller 104 is electrically connected to the SIM interface 109. The SIM interface controller 104 is electrically connected to the data storage 103. The SD interface 110 is electrically connected to the SD contact 3, and the SIM interface 109 is electrically connected to the SIM contact 4.

In the embodiment of the present invention, the data memory 103 includes EEPROM or MTP, which is used to store SIM card keys, PUK codes, etc., and store user phone numbers, short messages, etc. To ensure security, the data used by the SIM card is generally stored inside the chip EEPROM or MTP is not stored in external flash memory. EEPROM or MTP can also be used to store key parameters, program codes, etc. used by the SD card to improve the stability and service life of the SD memory card. It can also be used to store encryption related data such as the key used by the SD card to make an encrypted SD card. . EEPROM or MTP was originally used for SIM card, but it can also be used for SD card expansion function of large-capacity SIM card.

In the embodiment of the present invention, the DMA data path controller 107 reduces the burden of the CPU 101 during the large-capacity data transmission. The data path of the large-capacity data transmission is implemented by the DMA data path controller 107, and the CPU 101 does not need to participate in the data transmission process. In order to improve the read and write performance of the large-capacity SIM card, the DMA data path controller 107 coordinates the data transmission between the SD interface 110 and the flash memory chip 2 interface, and optimizes the internal data flow. In the embodiment of the present invention, the dedicated algorithm module 108 includes A3 and A8 encryption algorithms, and the encryption algorithm is used for the SIM card. The dedicated algorithm module 108 includes A3, A8 encryption algorithms and national secret algorithms. Among them, the encryption algorithm is used for the SIM card, and the national secret algorithm is used to encrypt the data used by the SIM card and the SD card. The national secret algorithm includes SM1, SM2, SM3, and SM4. .

3, the two-in-one control chip 1 is provided with a SIM interface aluminum pad 113 and an SD interface aluminum pad 114;

Each SIM interface aluminum pad 113 is electrically connected to the external SIM contact 4;

The SD interface aluminum pad 114 includes a first pad and a second pad. The first pad is electrically connected to the external SD contact 3 and the second pad is electrically connected to the flash memory chip 2.

In the embodiment of the present invention, the SIM interface aluminum pads 113 are distributed in an array. The SD interface aluminum pad 114 includes a first pad and a second pad. The first pad is electrically connected to the SD contact 3 for receiving or transmitting data to an external terminal, and the second pad is electrically connected to the flash memory chip 2 for use To transfer the data to be stored to the flash memory chip 2, or retrieve the stored data from the flash memory chip 2. In the embodiment of the present invention, the SIM interface aluminum pad 113 and the SD interface aluminum pad 114 are first wired to the substrate 5, and then connected to the SIM contact 4 and the SD contact 3, respectively.

In the embodiment of the present invention, the two-in-one control chip 1 further includes a power management module, a clock generation module, and a voltage detection module. Among them, the power management module is responsible for generating a two-in-one control chip 1 core, different voltages used by I/O, and realizing low power consumption management. The clock generation module is responsible for providing the operating clock for the two-in-one control chip 1. The voltage detection module is responsible for detecting the power-up and power-down process of the two-in-one control chip 1.

In the embodiment of the present invention, the modules that can be shared by the SIM card chip and the Micro SD card control chip include CPU101, RAM112, ROM102, data storage 103, power management module and clock generation module, etc. Through the above settings, all the circuits of the SIM card chip are integrated into the Micro The SD card control chip is made into a two-in-one control chip 1. Not only does the two-in-one control chip 1 share some functional modules, it saves the chip area and reduces the cost, which is similar to the SIM card chip and Micro Compared with the solution of separating the SD card control chip, the two-in-one control chip 1 occupies a smaller space in the inherently small packaging space, and it is easier to realize the packaging and wiring of a large-capacity SIM card.

4, the present invention also provides a method for controlling a SIM card with a large-capacity storage function, including:

S1: Determine whether CPU101 is processing SD interface commands;

S2: If yes, judge whether the CPU 101 has received the SIM interface command;

S3: If yes, CPU101 interrupts the processing of SD interface commands that require data transmission, and prioritizes processing of SIM interface commands.

In the embodiment of the present invention, the two-in-one control chip 1 determines whether the CPU 101 is processing SD interface commands. If so, it is determined whether the CPU 101 has received the SIM interface command. If it is, the CPU 101 interrupts the processing of the SD interface command that requires data transmission, and prioritizes the processing of the SIM interface command. Because the SIM card control module and the Micro SD card control module share the CPU101 and share a set of firmware programs, because the SD interface data communication allows a certain timeout period, the program must ensure that it responds to the commands of the SIM interface command communication first. For the SIM interface commands that require CPU101 to participate, the processing priority is higher than that of SD interface commands. If CPU101 is processing SD interface commands, and the SIM interface commands need to be processed by CPU101 at the same time, CPU101 will first suspend processing SD interface commands and finish processing SIM After the interface command is interrupted, continue to process the SD interface command. Through the above-mentioned settings, it is ensured that the large-capacity SIM card preferentially responds to the SIM interface commands, and avoids affecting the normal use of the SIM card when the large-capacity SIM card stores data. In other embodiments of the present invention, SD interface commands that do not need to be processed by the CPU 101 are processed by the SD protocol controller 105. Among them, the SD interface commands that do not require data transmission, such as CMD7, CMD8, CMD13, CMD16, ACMD6, ACMD22, etc., are processed by the SD protocol controller 105 without the participation of the CPU 101. The SD interface commands that require data transmission, such as CMD17, CMD18, CMD24, CMD25, etc., require CPU101 to participate in processing. Through the above configuration, the load of the CPU 101 is reduced, and the response speed of the data interaction between the two-in-one control chip 1 and the external terminal is improved.

Referring to Figure 5, if yes, CPU101 interrupts the processing of SD interface commands that require data transmission, and after step S3 of priority processing of SIM interface commands, it includes:

S4: For the interrupted SD interface command, call RAM112 for SD interface data buffering;

S5: After the SD interface data is buffered, the timeout timer 111 is started, and the timeout timer 111 starts timing with the start time of the timeout timer 111 as the first moment;

S6: The timeout timer judges in real time whether the time difference between the current moment and the first moment is greater than a preset time threshold;

S7: If yes, the CPU 101 suspends processing the SIM interface command and starts to process the SD interface command. After the CPU 101 finishes processing the SD interface command, it will continue to process the SIM interface command.

Embodiments of the present invention

Type here a paragraph describing the embodiment of the present invention.

Industrial applicability

In the embodiment of the present invention, the two-in-one control chip 1 adds a timeout timer 111 to ensure that the interrupted SD interface command gets a response before the timeout. Through the above settings, the SIM card chip and the Micro SD card chip can be integrated together, without affecting the original functions of the SIM card and the Micro SD card, and achieving compatibility between the two.

Sequence Listing Free Content

The above descriptions are only preferred embodiments of the present invention, and do not limit the scope of the present invention. Any equivalent structure or equivalent process transformation made by using the content of the description and drawings of the present invention, or directly or indirectly applied to other related The technical field is similarly included in the scope of patent protection of the present invention.

Claims (10)

1. A SIM card with a large-capacity storage function, which is characterized in that it includes:

   Two-in-one control chip, used for telecommunications service command processing, SIM interface communication with external terminals, and control and management of the flash memory chip, and transfer the data to be stored obtained by the external terminal SD interface to the flash memory chip and with the external terminal Carry out SD interface communication;

   The SIM contact is used to connect to the SIM interface of an external terminal and handle the interactive communication of telecommunications services;

   The SD contact is used to connect the SD interface of the external terminal to enable interactive communication of stored data between the external terminal and the two-in-one control chip;

   The flash memory chip is used to store the data to be stored transmitted by the two-in-one control chip;

   The substrate is used to carry the two-in-one control chip, the SIM contact, the SD contact, and the flash memory chip, and make an electrical connection between them.
2. The SIM card with a large-capacity storage function according to claim 1, wherein the two-in-one control chip comprises:

   CPU, used to run a firmware program, and coordinate the operation of each functional module in the two-in-one control chip according to the requirements of the firmware program;

   ROM, used to store firmware programs;

   Data storage for storing SIM card key, PUK code, storage of user phone number, short message, storage of key parameters used by SD card, program code and key used by SD card, wherein said data storage includes EEPROM or MTP;

   SIM interface controller, used for SIM interface communication and processing telecommunication business commands;

   SD protocol controller, used for parsing the SD interface communication protocol, processing commands, receiving data from the host or returning the data required by the host;

   The flash memory controller is used for the communication of the flash memory chip interface, realizes the flash memory chip reading, programming and erasing commands, and receives or sends the data of the flash memory chip interface;

   DMA data path controller, used to coordinate the data transmission between the SD interface and the flash chip interface, and optimize the internal data flow;

   Dedicated algorithm module, used to implement the encryption algorithm used by the SIM card, the ECC data error correction algorithm used by the SD card, the management acceleration algorithm of the flash memory chip, and the encryption algorithm used by the encrypted SD card;

   SIM interface, used to connect SIM contact 4 for SIM interface communication with external terminals;

   SD interface, used to connect SD contact 3 for SD interface communication with external terminals;

   The timeout timer is used to ensure that the CPU can respond to the SD interface communication command in time;

   RAM is used to store variables used in programs, buffer user data, and store data.
3. A SIM card with a large-capacity storage function according to claim 2, characterized in that:

   The flash memory controller, the DMA data controller, the SD protocol controller, the RAM, the dedicated algorithm module, the ROM, the SIM interface controller, and the timeout timer are all connected to the CPU electrical connection;

   The SD protocol controller is electrically connected to the SD interface;

   The SIM interface controller is electrically connected to the SIM interface;

   The SIM interface controller is electrically connected to the data storage;

   The SD interface is electrically connected with the SD contact, and the SIM interface is electrically connected with the SIM contact.
4. A SIM card with a large-capacity storage function according to claim 2, wherein the dedicated algorithm module includes A3, A8 encryption algorithms and national secret algorithms, wherein the encryption algorithm is used for the SIM card, so The national secret algorithm is used to encrypt the data used by the SIM card and SD card.
5. A SIM card with a large-capacity storage function according to claim 2, characterized in that:

   The SD interface version includes SD1.0, SD2.0, SD3.0, SD4.0, SD5.0, SD6.0 and SD7.0;

   The SIM interface complies with ISO/IEC 7816 agreement.
6. A SIM card with a large-capacity storage function according to claim 2, characterized in that:

   The two-in-one control chip is provided with a SIM interface aluminum pad and an SD interface aluminum pad;

   The SIM interface aluminum pad is electrically connected to the SIM contact;

   The SD interface aluminum pad is electrically connected to the SD contact.
7. The SIM card with a large-capacity storage function according to claim 2, wherein the two-in-one control chip further comprises: a power management module, a clock generation module, and a voltage detection module.
8. The SIM card with a mass storage function according to claim 7, wherein the CPU, the RAM, the ROM, the data memory module, the power management module, and the clock generation module are all Multiplexing module for SIM card and SD card function.
9. A method for controlling a SIM card with a large-capacity storage function, which is characterized in that it includes:

   Determine whether the CPU is processing SD interface commands;

   If yes, determine whether the CPU receives the SIM interface command;

   If so, the CPU interrupts the processing of the SD interface command that requires data transmission, and preferentially processes the SIM interface command.
10. The method for controlling a SIM card with a large-capacity storage function according to claim 9, characterized in that, if yes, the CPU interrupts the processing of SD interface commands that require data transmission, and the SIM interface commands are processed preferentially After the steps, include:

    For the interrupted SD interface command, call the RAM for SD interface data buffering;

    After buffering of the SD interface data is completed, a timeout timer is started, and the timeout timer starts timing with the start time of the timeout timer as the first moment;

    Judging in real time whether the time difference between the current moment and the first moment is greater than a preset time threshold;

    If so, the CPU suspends processing the SIM interface command, starts processing the SD interface command, and continues to process the SIM interface command after the CPU finishes processing the SD interface command.