CN111124976A - Smart card with communication and electric leakage prevention functions and working method thereof - Google Patents
Smart card with communication and electric leakage prevention functions and working method thereof Download PDFInfo
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- CN111124976A CN111124976A CN201811292489.9A CN201811292489A CN111124976A CN 111124976 A CN111124976 A CN 111124976A CN 201811292489 A CN201811292489 A CN 201811292489A CN 111124976 A CN111124976 A CN 111124976A
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- user identification
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- miso
- identification chip
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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
Abstract
The invention provides a smart card with communication and electric leakage prevention functions and a working method thereof. The intelligent card comprises a storage unit and a user identification unit, wherein the storage unit and the user identification unit are positioned on the substrate, the storage unit comprises an SD contact, a storage controller and a flash memory chip, the user identification unit comprises an SIM contact and a user identification chip which are mutually connected, and the storage controller and the user identification chip are mutually connected through an SPI protocol to carry out SPI interface communication; when the intelligent card starts to work, under different conditions that the storage controller is powered on or the user identification chip is powered on, the SSN signal line, the SCK signal line, the MOSI signal line and the MISO signal line are configured through the SPI interface, the storage controller sends a command, the user identification chip sends a response after receiving a processing command, the storage controller receives the response sent by the user identification chip, the sending/receiving process is finished, and the situation of electric leakage between the user identification unit and the storage unit is prevented.
Description
Technical Field
The invention relates to the technical field of smart cards, in particular to a smart card with communication and electric leakage prevention functions and a working method thereof.
Background
Chinese patent "a smart card with both SIM and SD functions" (patent No. ZL 201720632162.6), which discloses a smart card with a subscriber identification unit and a storage unit. Furthermore, the user identification unit inside the smart card can be connected with the storage unit through a line and perform information interaction, for example, an interface such as I2C, SPI and the like is adopted.
The use of such a smart card with internal connections will encounter different power supply regimes in different scenarios. For example, when the smart card is placed in a compatible slot between a mobile phone SD and a Nano, the power consumption of the user identification unit is low, the mobile phone can continuously supply power to the user identification unit, and the power of the storage unit can be turned off by the mobile phone when the storage unit is idle and is not accessed due to high power consumption. For example, when the smart card is inserted into a special SD card reader, only the storage unit is powered, and the user identification unit is powered down.
In summary, the power supply conditions of the storage unit and the user identification unit have four conditions as follows:
1) the storage unit is powered on, and the user identification unit is powered on;
2) powering off the storage unit and powering on the user identification unit;
3) the storage unit is powered on, and the user identification unit is powered off;
4) the memory unit and the user identification unit are powered down.
In both cases 2) and 3) above, if the interface connection between the memory unit and the subscriber identification unit is not properly handled, a leakage current will result from one side of power-up to the other side of power-down through the connection line. For example, when the subscriber identity unit is powered on and the memory unit is powered off, the subscriber identity unit drives the interconnect line high and current will flow to the memory unit.
Disclosure of Invention
Aiming at the problem of current leakage caused by power off of the user identification unit and the storage unit, the invention provides the intelligent card with the functions of communication and electric leakage prevention and the working method thereof, which can ensure normal communication between the user identification unit and the storage unit and prevent the electric leakage between the user identification unit and the storage unit.
In order to achieve the technical purpose, the technical scheme adopted by the invention is as follows:
an intelligent card with communication and electric leakage prevention functions comprises a storage unit and a user identification unit, wherein the storage unit and the user identification unit are positioned on a substrate, the storage unit comprises an SD contact, a storage controller and a flash memory chip, and the SD contact and the flash memory chip are respectively connected with the storage controller;
the user identification unit comprises an SIM contact and a user identification chip which are connected with each other;
the storage controller in the storage unit and the user identification chip in the user identification unit are mutually connected through an SPI protocol to carry out SPI interface communication, the SPI interface is divided into an SPI main interface and an SPI slave interface, the SPI main interface is positioned at one end of the storage controller, the SPI slave interface is positioned at one end of the user identification chip, and the SPI main interface and the SPI slave interface are connected through an SSN signal line, an SCK signal line, an MOSI signal line and an MISO signal line;
the first resistor R1 is connected with the MISO signal wire, the resistance value is set to be 10-100K omega, and one end of the memory controller enables the first resistor R1 on the MISO signal wire;
the second resistor R2 is a pull-down resistor connected with the MISO signal wire and is set to have a resistance value of 100K omega-10M omega;
the SD contact supplies power to the storage unit through an external corresponding main control, and the SIM contact supplies power to the user identification unit through an external corresponding main control;
when the smart card starts to work, a storage controller in the storage unit is powered on, or a user identification chip in the user identification unit is powered on, an SSN signal line, an SCK signal line, an MOSI signal line and a MISO signal line are configured to be low level through an SPI interface, the storage controller sends a command, the user identification chip in the user identification unit is awakened from a dormant state through a first resistor R1, the user identification chip receives the command, the user identification chip sends a response after processing the command, the storage controller receives the response sent by the user identification chip, and the sending/receiving process is ended.
Preferably, four IO interfaces of the memory controller are all set as inputs or outputs of SPI pins or GPIOs.
Preferably, four IO interfaces of the user identification unit are all set as inputs or outputs of SPI pins or GPIOs.
A working method of a smart card with communication and electric leakage prevention functions comprises a storage unit and a user identification unit, wherein the storage unit and the user identification unit are located on a substrate, the storage unit comprises an SD contact, a storage controller and a flash memory chip, the SD contact and the flash memory chip are respectively connected with the storage controller, the user identification unit comprises an SIM contact and a user identification chip which are connected with each other, the storage controller and the user identification chip are connected with each other through an SPI protocol to carry out SPI interface communication, and are connected through an SSN signal line, an SCK signal line, an MOSI signal line and a MISO signal line, a first resistor is connected with the MISO signal line, a second resistor is a pull-down resistor connected with the MISO signal line, and the working method comprises the following specific steps:
the first step is as follows: a power-on initialization stage; when the smart card starts to work, a storage controller of a storage unit is powered on, an SSN signal line, an SCK signal line and an MOSI signal line are configured to be low in output, an MISO signal line is configured to be input, and a first resistor R1 is not enabled; one end of the user identification unit is electrified, the SSN signal line, the SCK signal line and the MOSI signal line are configured to be low in output, the MISO signal line is configured to be input without a pull-up resistor, at the moment, the four SPI signal lines are all low level, and the storage unit or the user identification unit does not have electric leakage of the electrified side and the electrified side;
the second step is as follows: the storage controller sends command, the user identification chip receives command phase; the memory controller enables the first resistor R1, the MISO signal line will be pulled high, the first resistor R1 will not be enabled, the MISO signal line will go low, the subscriber identity chip in the subscriber identity unit will be woken up from the sleep state, and the SSN signal line, the SCK signal line and the MOSI signal line are immediately configured to be in SPI mode, and the MISO signal line is configured to be output high; when the storage controller detects that the MISO signal line is pulled high, the SSN signal line, the SCK signal line and the MOSI signal line are configured to be in an SPI mode and send commands; otherwise, the memory controller does not receive that the MISO signal line is pulled high after overtime, the SSN signal line, the SCK signal line and the MOSI signal line are configured to output low, and the sending command receiving is finished; a user identification chip in the user identification unit receives a command sent by the storage controller and then carries out corresponding processing, or if the receiving is overtime, an SSN signal line, an SCK signal line and an MOSI signal line are configured to be low in output, an MISO signal line is configured to be input without pull-up, and the user identification chip enters a dormant state;
the third step: the user identification chip sends response, and the storage controller receives the response; after the command processing at one end of the user identification chip is finished, firstly, outputting low to the MISO signal line, then immediately configuring the MISO signal line to be in an SPI mode and waiting for sending response, if the sending response is finished or the sending response is overtime, configuring the SSN signal line, the SCK signal line and the MOSI signal line to be output low, configuring the MISO signal line to be input without pull-up and entering a dormant state; after the storage controller sends the command, entering a response receiving stage and detecting whether the MISO signal wire becomes low or not; when the MISO signal line is detected to be low, the response is received, and then the transmitting/receiving process is ended; if the response reception is overtime, the SSN signal line, the SCK signal line, and the MOSI signal line are configured to output low, and the transmission/reception process is ended this time.
The invention relates to a smart card with communication and leakage-proof functions and a working method thereof, which adopts a structure that a storage controller in a storage unit is mutually connected with a user identification chip in a user identification unit through an SPI protocol to carry out SPI interface communication, the SPI interface is connected through an SSN signal line, an SCK signal line, an MOSI signal line and an MISO signal line, and the invention has the advantages that, when the intelligent card starts to work, under different conditions that the storage controller is electrified or the user identification chip is electrified, SSN signal line, SCK signal line, MOSI signal line and MISO signal line are configured through SPI interface to realize that storage controller sends command, user identification chip receives command, then the user identification chip sends a response after processing the command, the storage controller receives the response sent by the user identification chip, and the sending/receiving process is ended, so that the electricity leakage between the user identification unit and the storage unit is prevented.
Drawings
Fig. 1 is a block diagram of a smart card architecture with communication and leakage prevention features in accordance with an embodiment of the present invention.
FIG. 2 is a schematic diagram of the interconnection of a memory controller and a subscriber identity module in accordance with an embodiment of the present invention.
Fig. 3 is a flow chart of a method for operating a smart card with communication and leakage prevention features in accordance with an embodiment of the present invention.
Detailed Description
Referring to fig. 1, a block diagram of a smart card architecture with communication and leakage prevention functions is shown in accordance with an embodiment of the present invention. The smart card with communication and leakage prevention functions, which is embodied by the invention, comprises a storage unit 200 and a user identification unit 300, wherein the storage unit 200 and the user identification unit 300 are positioned on a substrate 100, the storage unit 200 comprises an SD contact 210, a storage controller 220 and a flash memory chip 230, and the SD contact 210 and the flash memory chip 230 are respectively connected with the storage controller 220.
The subscriber identity unit 300 comprises a SIM contact 310 and a subscriber identity chip 320 connected to each other.
The first resistor R1 is connected to the MISO signal line, and has a resistance value of 10K omega-100K omega, and one end of the memory controller enables the first resistor R1 on the MISO signal line.
The second resistor R2 is a pull-down resistor connected with the MISO signal line and has a resistance value of 100K omega-10M omega.
The SD contact 210 supplies power to the memory unit 200 through an external corresponding master, and the SIM contact 310 supplies power to the subscriber identification unit 300 through an external corresponding master.
Referring to fig. 1 and 2, when the smart card starts to operate, the memory controller 220 in the memory unit 200 is powered on, or the user identification chip 320 in the user identification unit 300 is powered on, the SSN signal line, the SCK signal line, the MOSI signal line, and the MISO signal line are configured to be at a low level through the SPI interface, the memory controller 220 sends a command, the user identification chip 320 in the user identification unit 300 is waken up from a sleep state through the first resistor R1, the user identification chip 320 receives the command, the user identification chip 320 processes the command and then sends a response, the memory controller 220 receives the response sent by the user identification chip 320, and the sending/receiving process is ended.
Referring to fig. 2, a schematic diagram of the interconnection between a memory controller and a user identification chip is shown in accordance with an embodiment of the present invention. The subscriber identification unit 300 includes a SIM contact 310 and a subscriber identification chip 320 connected to each other; storage controller 220 in memory cell 200 carries out SPI interface communication through SPI agreement interconnect with user identification chip 320 in the user identification unit 300, and the SPI interface divide into SPI main interface and SPI from the interface, and SPI main interface is located storage controller one end, and SPI is followed the interface and is located user identification chip one end, and SPI main interface and SPI are followed the interface and are passed through SSN signal line, SCK signal line, MOSI signal line and MISO signal line and are established the connection.
The first resistor R1 is connected to the MISO signal line, and has a resistance value of 10K omega-100K omega, and one end of the memory controller enables the first resistor R1 on the MISO signal line.
The second resistor R2 is a pull-down resistor connected with the MISO signal line and has a resistance value of 100K omega-10M omega. The second resistor R2 functions to ensure a reliable low level; that is, when the first resistor R1 is enabled, the MISO line can be pulled high again, so that the second resistor acts as a pull-down resistor with a large resistance value, ensuring a reliable low level.
The SD contact 210 supplies power to the memory unit 200 through an external corresponding master, and the SIM contact 310 supplies power to the subscriber identification unit 300 through an external corresponding master; referring to fig. 2, VCC1 is the interface power supply for memory controller 220.
When the smart card starts to work, the memory controller 220 in the memory unit 200 is powered on, or the user identification chip 320 in the user identification unit 300 is powered on, the SSN signal line, the SCK signal line, the MOSI signal line, and the MISO signal line are configured to be at low level through the SPI interface, the memory controller 220 sends a command, the user identification chip 320 in the user identification unit 300 is waken up from a sleep state through the first resistor R1, the user identification chip 320 receives the command, the user identification chip 320 sends a response after processing the command, the memory controller 220 receives the response sent by the user identification chip 320, and the sending/receiving process is ended.
Referring to fig. 3, a flow chart of a method for operating a smart card with communication and leakage prevention functions is shown. The invention relates to a working method of a smart card with communication and leakage prevention functions, which comprises the following steps:
the first step is as follows: a power-on initialization stage; when the smart card starts to work, the memory controller 220 of the memory unit 200 is powered on, the SSN signal line, the SCK signal line and the MOSI signal line are configured to output low, the MISO signal line is configured to input, and the first resistor R1 is disabled; one end of the subscriber identity module 300 is powered on, the SSN signal line, the SCK signal line and the MOSI signal line are configured to output low, the MISO signal line is configured to input without a pull-up resistor, at this time, the four SPI signal lines are all low, and neither the memory cell 200 nor the subscriber identity module 300 has a leakage current from the power-on side to the power-off side.
The second step is as follows: the memory controller 220 sends a command, and the user identification chip 320 receives the command; memory controller 220 enables first resistor R1, the MISO signal line will be pulled high, first resistor R1 is no longer enabled, the MISO signal line will go low, wake up subscriber identity chip 320 in subscriber identity unit 300 from the sleep state, and immediately configure the SSN, SCK and MOSI signal lines to SPI mode and MISO signal line to output high; when the memory controller 220 detects that the MISO signal line is pulled high, the SSN signal line, the SCK signal line and the MOSI signal line are configured to be in an SPI mode and send commands; otherwise, if the memory controller 220 does not receive that the MISO signal line is pulled high after timeout, the SSN signal line, the SCK signal line, and the MOSI signal line are configured to output low, and this time, the sending of the command is finished; the user identification chip 320 in the user identification unit 300 performs corresponding processing after receiving a command sent by the memory controller 220, or configures the SSN signal line, the SCK signal line, and the MOSI signal line to output low when receiving timeout, configures the MISO signal line to input without pulling up, and enters the sleep state by the user identification chip 320.
The third step: the user identification chip 320 sends a response, and the storage controller 220 receives the response phase; after the command processing at one end of the subscriber identification chip 320 is finished, firstly, outputting low to the MISO signal line, then immediately configuring the MISO signal line to be in an SPI mode and waiting for sending response, if the sending response is finished or the sending response is overtime, configuring the SSN signal line, the SCK signal line and the MOSI signal line to be outputting low, configuring the MISO signal line to be input without pulling up, and entering a dormant state; after the memory controller 220 finishes sending the command, entering a response receiving stage and detecting whether the MISO signal wire becomes low; when the MISO signal line is detected to be low, the response is received, and then the transmitting/receiving process is ended; if the response reception is overtime, the SSN signal line, the SCK signal line, and the MOSI signal line are configured to output low, and the transmission/reception process is ended this time.
The present invention is not limited to the embodiments discussed above, and the above description of specific embodiments is intended to describe and illustrate the technical solutions to which the present invention relates. Obvious modifications or alterations based on the teachings of the present invention should also be considered as falling within the scope of the present invention; the foregoing detailed description is provided to disclose the best mode of practicing the invention, and also to enable a person skilled in the art to utilize the invention in various embodiments and with various alternatives for carrying out the invention.
Claims (4)
1. The intelligent card with the functions of communication and electric leakage prevention is characterized by comprising a storage unit and a user identification unit, wherein the storage unit and the user identification unit are positioned on a substrate;
the user identification unit comprises an SIM contact and a user identification chip which are connected with each other;
the storage controller in the storage unit and the user identification chip in the user identification unit are mutually connected through an SPI protocol to carry out SPI interface communication, the SPI interface is divided into an SPI main interface and an SPI slave interface, the SPI main interface is positioned at one end of the storage controller, the SPI slave interface is positioned at one end of the user identification chip, and the SPI main interface and the SPI slave interface are connected through an SSN signal line, an SCK signal line, an MOSI signal line and an MISO signal line;
the first resistor is connected with the MISO signal wire, the resistance value is set to be 10-100K omega, and one end of the memory controller enables the first resistor R1 on the MISO signal wire;
the second resistor is a pull-down resistor connected with the MISO signal wire and is set to have a resistance value of 100K omega-10M omega;
the SD contact supplies power to the storage unit through an external corresponding main control, and the SIM contact supplies power to the user identification unit through an external corresponding main control;
when the smart card starts to work, a storage controller in the storage unit is powered on, or a user identification chip in the user identification unit is powered on, an SSN signal line, an SCK signal line, an MOSI signal line and a MISO signal line are configured to be low level through an SPI interface, the storage controller sends a command, the user identification chip in the user identification unit is awakened from a dormant state through a first resistor R1, the user identification chip receives the command, the user identification chip sends a response after processing the command, the storage controller receives the response sent by the user identification chip, and the sending/receiving process is ended.
2. The smart card with communication and leakage prevention functions of claim 1, wherein the four IO interfaces of the memory controller are all set as inputs or outputs of SPI pins or GPIOs.
3. The smart card with communication and leakage prevention functions of claim 1, wherein the four IO interfaces of the subscriber identification unit are all set as inputs or outputs of SPI pins or GPIOs.
4. An operating method of a smart card with communication and leakage prevention functions is characterized by comprising the following specific steps:
the first step is as follows: a power-on initialization stage; when the smart card starts to work, a storage controller of a storage unit is powered on, an SSN signal line, an SCK signal line and an MOSI signal line are configured to be low in output, an MISO signal line is configured to be input, and a first resistor R1 is not enabled; one end of the user identification unit is electrified, the SSN signal line, the SCK signal line and the MOSI signal line are configured to be low in output, the MISO signal line is configured to be input without a pull-up resistor, at the moment, the four SPI signal lines are all low level, and the storage unit or the user identification unit does not have electric leakage of the electrified side and the electrified side;
the second step is as follows: the storage controller sends command, the user identification chip receives command phase; the memory controller enables the first resistor R1, the MISO signal line will be pulled high, the first resistor R1 will not be enabled, the MISO signal line will go low, the subscriber identity chip in the subscriber identity unit will be woken up from the sleep state, and the SSN signal line, the SCK signal line and the MOSI signal line are immediately configured to be in SPI mode, and the MISO signal line is configured to be output high; when the storage controller detects that the MISO signal line is pulled high, the SSN signal line, the SCK signal line and the MOSI signal line are configured to be in an SPI mode and send commands; otherwise, the memory controller does not receive that the MISO signal line is pulled high after overtime, the SSN signal line, the SCK signal line and the MOSI signal line are configured to output low, and the sending command receiving is finished; a user identification chip in the user identification unit receives a command sent by the storage controller and then carries out corresponding processing, or if the receiving is overtime, an SSN signal line, an SCK signal line and an MOSI signal line are configured to be low in output, an MISO signal line is configured to be input without pull-up, and the user identification chip enters a dormant state;
the third step: the user identification chip sends response, and the storage controller receives the response;
after the command processing at one end of the user identification chip is finished, firstly, outputting low to the MISO signal line, then immediately configuring the MISO signal line to be in an SPI mode and waiting for sending response, if the sending response is finished or the sending response is overtime, configuring the SSN signal line, the SCK signal line and the MOSI signal line to be output low, configuring the MISO signal line to be input without pull-up and entering a dormant state; after the storage controller sends the command, entering a response receiving stage and detecting whether the MISO signal wire becomes low or not; when the MISO signal line is detected to be low, the response is received, and then the transmitting/receiving process is ended; if the response reception is overtime, the SSN signal line, the SCK signal line, and the MOSI signal line are configured to output low, and the transmission/reception process is ended this time.
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| CN201811292489.9A CN111124976A (en) | 2018-11-01 | 2018-11-01 | Smart card with communication and electric leakage prevention functions and working method thereof |
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| CN201811292489.9A CN111124976A (en) | 2018-11-01 | 2018-11-01 | Smart card with communication and electric leakage prevention functions and working method thereof |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113312297A (en) * | 2021-06-22 | 2021-08-27 | 张玉禄 | SPI follows interface, security chip and SPI flash memory electron device |
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2018
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113312297A (en) * | 2021-06-22 | 2021-08-27 | 张玉禄 | SPI follows interface, security chip and SPI flash memory electron device |
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