CN107004105B - An information card identification circuit and terminal - Google Patents

Abstract

A kind of release identification circuit and terminal, are related to field of communication technology, solve existing user and obscure SIM card interface and intelligent card interface, lead to the problem of plug-in card mistake.Release identification circuit (10) includes: deck (101), the selection switch of N × 1 (102), N number of information card control chip (103) and controller (104)；Deck (101), for loading release, the selection switch of N × 1 (102), the release loaded on deck (101) is connected to by the control signal for being inputted according to controller (104) with a chip in N number of information card control chip (103)；N number of information card control chip (103), for controlling N kind release correspondingly；Controller (104), for detecting whether there is release to be loaded into deck (101), after having detected that release is loaded into deck (101), successively switch (102) is selected to input M control signal to N × 1, until controller (104) are after receiving response data, when determining that release matches with the information card control chip (103) that release is currently connected to, terminates to control terminal and send control signal.

Description

An information card identification circuit and terminal

technical field

The invention relates to the field of communication technology, in particular to an information card identification circuit and a terminal.

Background technique

With the development of multimedia technology, the functions of the set-top box are diversified, and can support smart cards and subscriber identity module (Subscriber Identity Module, SIM) cards at the same time, so as to realize dual-card insertion.

However, according to the design dimensions of smart cards and SIM cards in the International Organization for Standardization (International Organization for Standardization, ISO) 7816 protocol, when many manufacturers design set-top boxes, the dimensions of the designed SIM interface and smart card interface are the same. This makes it easy for many users to confuse the two interfaces during the process of inserting the SIM card and the smart card, resulting in card insertion errors and extremely poor user experience.

Contents of the invention

The embodiment of the present invention provides an information card identification circuit and terminal, which solves the problem that existing users confuse the card slot and cause wrong card insertion.

In order to achieve the above object, embodiments of the present invention adopt the following technical solutions:

In the first aspect, an embodiment of the present invention provides an information card identification circuit, including: a card holder, an N×1 selection switch, N information card control chips, and a controller; said N is an integer greater than or equal to 2; The N×1 selection switch includes: a control terminal, a common terminal, and N selection terminals, the control terminal is connected to the controller, the common terminal is connected to the first end of the deck, and N selection terminals The terminals are respectively connected to the N information card control chips; the controller is connected to the second end of the card holder and the N information card control chips;

Wherein, the card holder is used for loading information cards;

The information card is configured to send response data to the information card control chip;

The information card control chip is configured to receive the response data and send the response data to the controller after it is determined to be connected to the information card;

The controller is used to detect whether the information card is loaded on the deck, and when it is detected that the information card is loaded on the deck, sequentially output to the control terminal of the N×1 selection switch Control signals, until the controller determines that the information card matches the information card control chip currently connected to the information card after receiving the response data, and then terminates sending the control signal to the control terminal;

The N×1 selection switch is used for connecting the information card loaded on the deck with one of the N information card control chips according to the control signal received from the control terminal.

In the first implementable manner of the first aspect, in combination with the first aspect, the controller sequentially outputs control signals to the control terminal of the N×1 selection switch, specifically, the controller is used for:

Outputting a first control signal to the control terminal of the N×1 selection switch, the first control signal is used to instruct the N×1 selection switch to connect the common terminal with the first selection terminal, and the first selection The end is connected with the first information card control chip;

determining whether the control chip of the information card matches the first information card;

If it matches, stop outputting the control signal to the control terminal of the N×1 selection switch; if not, send a second control signal to the N×1 selection switch, and the second control signal is used to indicate the The N×1 selection switch connects the common terminal with the second selection terminal, and the second selection terminal is connected with the control chip of the second information card.

In the second implementable manner of the first aspect, in combination with the first implementable manner of the first aspect, the controller is configured to determine whether the information card matches the first information card control chip, specifically, The controller is used for:

Sending indication messages to the first information card control chip in sequence until receiving the response data returned by the first information card control chip, terminating sending indication messages to the first information card control chip; Instructing the first information card control chip to send a power supply signal, a reset signal and a clock signal to the information card;

Obtain attribute information of the information card; the attribute information is used to identify the information card;

Querying the preset information card control relationship table; the information card control relationship table is used to store: the corresponding relationship between the information card control chip and the information card controlled by the information card control chip;

If the information card corresponds to the first information card control chip, then determine that the information card matches the first information card control chip;

If the information card does not correspond to the first information card control chip, it is determined that the information card does not match the first information card control chip.

In the third implementable manner of the first aspect, in combination with the second implementable manner of the first aspect, the controller is configured to sequentially send indication messages to the first information card control chip, specifically, the control device for:

Send a first indication message to the first information card control chip according to a preset power supply sequence, the first indication message is used to instruct the first information card control chip to send a first power supply signal and a reset signal to the information card and clock signal;

If the response data returned by the first information card control chip is not received within the preset time, a second indication message is sent to the first information card control chip, and the second indication message is used to indicate the The first information card control chip sends a second power supply signal, a reset signal and a clock signal to the information card.

In the fourth possible realization of the first aspect, in combination with any one of the third possible realizations from the first aspect to the first aspect, the deck is provided with: connecting the controller Card presence detection circuit;

The controller is used to detect whether the information card is loaded on the deck. Specifically, the controller is used to:

According to the voltage value of the card presence detection circuit, it is determined whether the information card is loaded in the card holder.

In a second aspect, an embodiment of the present invention provides a terminal, including at least one information card identification circuit as described in any one of the fourth implementable manners from the first aspect to the first aspect.

It can be seen from the above that the embodiment of the present invention provides an information card identification circuit, including: a card holder, an N×1 selection switch, N information card control chips, and a controller; the card holder is used to load an information card, and the The N×1 selection switch is used to connect the information card loaded on the deck with one of the N information card control chips according to the control signal input by the controller; the N information cards The control chip is used to control N types of information cards in a one-to-one correspondence; the controller is used to detect whether there is an information card loaded on the card holder, and when it is detected that an information card is loaded on the card holder, the The N×1 selection switch inputs M control signals until the controller determines that the information card matches the information card control chip currently connected to the information card after receiving the response data, and terminates sending The control terminal sends a control signal. In this way, in the information card identification circuit provided by the embodiment of the present invention, after the user loads the information card into the card slot, the controller sequentially sends control signals to the selection switch to make the selection switch switch between the information card and the information card control chip. Connect until the information card is connected with the matching information card control chip. For the user, there is no need to worry about the error of the information card, which improves the user experience and solves the problem that the existing users confuse the SIM card interface and the smart card interface, resulting in wrong card insertion. question.

Description of drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings that need to be used in the description of the embodiments or the prior art. Obviously, the accompanying drawings in the following description are only These are some embodiments of the present invention. Those skilled in the art can also obtain other drawings based on these drawings without creative work.

Fig. 1 is a structural diagram of an information card identification circuit provided by an embodiment of the present invention;

Fig. 2 is a structural diagram of a deck provided by an embodiment of the present invention;

FIG. 3 is a structural diagram of a 2×1 selection switch provided by an embodiment of the present invention;

FIG. 4 is a structural diagram of a terminal provided by an embodiment of the present invention.

Detailed ways

The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some, not all, embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without creative efforts fall within the protection scope of the present invention.

Fig. 1 is a structural diagram of an information card identification circuit 10 provided by an embodiment of the present invention. As shown in Fig. 1, the information card identification circuit may include: a deck 101, an N×1 selection switch 102, and N information cards Controlling the chip 103 and the controller 104, the N is an integer greater than or equal to 2.

Wherein, the card holder 101 is used for loading information cards.

The information card can be: a customer identification module (Subscriber Identity Module, SIM) card, or a smart card, used to send response data to the information card control chip when the power supply is successful; the response data can be information The IO communication clock frequency of the card.

The N×1 selection switch 102 may include: a control terminal, a common terminal and N selection terminals; the common terminal is connected to the first terminal of the deck 101, the control terminal is connected to the controller 104, and the The N selection terminals are respectively connected to the N information card control chips 103 in one-to-one correspondence; for selecting the common terminal with one of the N selection terminals according to the control signal received from the control terminal The terminals are connected, that is, the information card loaded on the deck is connected with one of the N information card control chips.

The controller 104 can be a central processing unit (central processing unit, CPU), connected to the second end of the card holder 101 and the N information card control chips; used to detect whether there is the information card loaded on the deck, and when it is detected that the information card is loaded on the deck, the control signal is sequentially output to the control terminal of the N×1 selection switch until the controller receives the response After receiving the data, when it is determined that the information card matches the information card control chip currently connected to the information card, the sending of the control signal to the control terminal is terminated.

Wherein, the matching mentioned in the embodiment of the present invention may refer to: the information card control chip that is currently connected to the information card is the control chip that controls the information card.

In this way, in the information card identification circuit provided by the embodiment of the present invention, after the user loads the information card into the card slot, the controller sequentially sends control signals to the selection switch to make the selection switch switch between the information card and the information card control chip. Connect until the information card is connected with the matching information card control chip. For the user, there is no need to worry about the error of the information card, which improves the user experience and solves the problem that the existing users confuse the SIM card interface and the smart card interface, resulting in wrong card insertion. question.

Specifically, following the ISO7816 protocol specification, existing information cards including smart cards or SIM cards usually need to be provided with four functional metal pins, such as: power supply voltage (Volt Current Condenser, VCC) pin, reset ( Reset, RST) pins, input and output (Input Output, IO) pins, clock (Clock, CLK) pins are pins for data transmission, therefore, in order to make the information card loaded on the card holder 101, and with the information The card control chip is connected to complete data communication. The first end of the card holder 101, the common end of the N×1 selection switch 102, each selection end of the N×1 selection switch 102, and the information card control chip All need to be provided with correspondingly: VCC pin, RST pin, IO pin, and CLK pin four pins; The connection can be specifically:

The four pins of the first end are connected with the four pins set at the common end of the N×1 selection switch 102: VCC pin, RST pin, IO pin, and CLK pin one by one to form four Connection channel.

The connection between the selection terminal and the control chip of the information card may specifically be:

The four pins of the selection end are connected with four pins on the information card control chip: VCC pin, RST pin, IO pin, and CLK pin one by one to form four connection channels.

Specifically, in order to conveniently detect whether there is a card loaded in the card holder 101, in the embodiment of the present invention, the card holder 101 may also be provided with: a card in-position detection circuit; the card in-position detection circuit; The measuring circuit is connected with the controller;

Wherein, the card presence detection circuit can present different voltage values according to the information card loaded or pulled out from the card holder 101;

The controller can be used to determine whether an information card is loaded in the card holder 101 according to the voltage value of the card position detection circuit.

For example, FIG. 2 is a structural diagram of the deck 101 in FIG. 1 provided by the embodiment of the present invention. As shown in FIG. 2, the deck includes 13 metal pins and a 3.3V+10K resistor pull-up peripheral Circuit, wherein, the 9th pin is a detection pin, which is connected with the peripheral circuit to form a card in-position detection circuit, and the controller is connected with the card in-position detection circuit, if it can be connected with the 9th pin, also It can be connected to the detection point of the circuit; when the information card is loaded in the card holder, the pin is disconnected from the ground internally, and the external pin (that is, the detection point) is high voltage; when there is no card loaded in the card holder , the pin is internally grounded, and the external pin (at the detection point) is a low voltage. It should be noted that the pins included in the card holder shown in FIG. 2 are only exemplary pins, and do not constitute a limitation on the structure of the card holder itself.

Specifically, in the embodiment of the present invention, the controller 104 may be used to:

Outputting a first control signal to the control terminal of the N×1 selection switch, the first control signal is used to instruct the N×1 selection switch to connect the common terminal with the first selection terminal, and the first selection The end is connected with the first information card control chip;

determining whether the control chip of the information card matches the first information card;

If they match, stop outputting the control signal to the control terminal of the N×1 selection switch;

If they do not match, then send a second control signal to the N×1 selector switch, re-determine whether the information card matches the first information card control chip, and stop sending the control signal or continue sending the next one according to the matching situation. Control information until the information card control chip selected by the N×1 selection switch according to the control signal matches the information card.

Wherein, the second control signal is used to instruct the N×1 selection switch to connect the common terminal to the second selection terminal, and the second selection terminal is connected to the second information card control chip.

It should be noted that the control signal described in the embodiment of the present invention can be represented by any form of signal capable of instructing the N×1 to connect the common terminal to a selection terminal, and the comparison is not limited in the embodiment of the present invention; : when N=2, the control signal can be a high-voltage signal or a low-voltage signal, and a high-voltage signal is used to indicate that the information card is connected to an information card control chip, and a low-voltage signal is used to indicate that the information card is connected to another information card The control chip is connected; when N=4, the following 4 types of control signals can be set: 00, 01, 10, 11, which respectively correspond to instructions to connect the information card with the first information card control chip, the second information card control chip, the second information card control chip, and the second information card control chip. The third information card control chip and the fourth information card control chip are connected.

For example, FIG. 3 shows a structural diagram of a 2×1 selection switch provided by an embodiment of the present invention, which is used to gate the information card and the SIM control chip or the smart card control chip according to the control signal, wherein the control signal can be high Voltage, low voltage two kinds of signals; As shown in Figure 3, this selection switch comprises 8 three-state buffers, is divided into two groups and is connected with SIM control chip, smart card control chip respectively, and wherein, described three-state buffer is in high It is in a conduction state under low voltage, and it is in an off state under low voltage, and the input end of a group of tri-state buffers connected with the SIM control chip is connected with an inverter, and the inverter can turn high (low) The voltage is converted to a low (high) voltage; thus, when the control signal CONTROL_EN is a high voltage signal, the tri-state buffer connected to the smart card control chip is in a conduction state, thereby making the information card communicate with the smart card control chip, and passing through the inverter Output to a group of three-state buffers connected with the SIM control chip is a low voltage, so that the three-state buffers connected with the SIM card control chip are in a cut-off state, and the information card and the SIM card control chip cannot be communicated. It should be noted that the 2×1 selection switch shown in FIG. 3 is only an exemplary structural diagram. In actual application, the selection switch may also include circuits such as voltage conversion, which will not be described in detail here.

Specifically, in the embodiment of the present invention, the controller 104 can determine whether the information card matches the information card control chip through the following methods, such as:

Sending indication messages to the first information card control chip in sequence until receiving the response data returned by the first information card control chip, terminating sending indication messages to the first information card control chip; Instructing the first information card control chip to send a power supply signal, a reset signal and a clock signal to the information card;

Obtain attribute information of the information card; the attribute information is used to identify the information card;

Querying the preset information card control relationship table; the information card control relationship table is used to store: the corresponding relationship between the information card control chip and the information card controlled by the information card control chip;

If the information card corresponds to the first information card control chip, then determine that the information card matches the first information card control chip;

If the information card does not correspond to the first information card control chip, it is determined that the information card does not match the first information card control chip.

For example, as shown in Table 1 below, it is a pre-stored information card control relationship table. If the first information card control chip is: SIM control chip, the obtained information card attribute information identifies the information card as: smart card, then according to Table 1 It can be determined that the first information card control chip does not match the information card; if the identification information of the first information card control chip obtained by the controller identifies the control chip as: SIM control chip, the obtained information card attribute The information identifies that the information card is a SIM card, and it can be determined according to Table 1 that the first information card control core matches the information card.

Table 1

Information card control chip information card SIM control chip SIM card Smart card control chip smart card

Specifically, in order to ensure the normal operation of the information card, the controller 104 is specifically used for:

Send a first indication message to the first information card control chip according to a preset power supply sequence, the first indication message is used to instruct the first information card control chip to send a first power supply signal and a reset signal to the information card and clock signal;

If the response data returned by the first information card control chip is not received within the preset time, a second indication message is sent to the first information card control chip, and the second indication message is used to indicate the The first information card control chip sends a second power supply signal, a reset signal and a clock signal to the information card.

Wherein, the power supply signal is used to supply power to the information card, the reset signal is used to initialize the information card, and the clock signal is used to synchronize the clock of the information card, so that the information card and the information card control chip can complete data communication.

The preset time is set as required, and is not limited in this embodiment of the present invention.

The preset power supply sequence may be: a power supply sequence from low to high, so as to avoid the high-voltage power supply directly to the information card, causing the problem of the information card being burned; for example, following the ISO7816 protocol, the existing information card power supply voltage Generally: 1.8V and 3.3V. For example, the power supply voltage of the smart card is 3.3V, and the power supply voltage of the SIM card is 1.8V and 3.3V. The information card uses 3.3V high-voltage power supply, but first instructs the information card control chip to supply 1.8V power supply to the information card, if there is no response, it means that the information card does not work at 1.8V, and then instructs the information card control chip The card is powered by 3.3V; if the response data is returned, it means that the information card is working normally under this voltage value, and its attribute information can be read directly.

Below with N=2, 2 information card control chips are respectively: SIM card control chip, smart card control chip, described N * 1 is the 2 * 1 selection switch as shown in Figure 3 as example, to the information card provided by the present invention How the identification circuit automatically connects the SIM card or smart card loaded in the card holder with its matching control chip will be described in detail. The power supply voltage of the SIM card is 1.8V and 3.3V, and the power supply voltage of the smart card is 1.8V:

1. After the SIM card is inserted into the card holder, the controller detects that there is a card inserted through the card detection circuit.

2. The controller inputs high voltage to the 2×1 selection switch, and controls the selection switch to connect the card with the SIM card control chip.

3. The controller sends the first instruction information to the SIM card control chip, so that the SIM control chip supplies the card with 1.8V voltage, a reset signal, and a clock signal.

4. If the controller receives the response data (such as ATR data) returned by the card through the SIM control chip, it will obtain the attribute information of the information card. If the attribute information indicates that the card is a SIM card, the card and its control chip will be successfully connected. connected, stop sending control signals; if the attribute information indicates that the card is a smart card, then input a low voltage to the 2×1 selector switch, and control the selector switch to connect the card with the smart card control chip.

5. If the controller does not get the response data within the preset time, it will send the second instruction information to the SIM card control chip, so that the SIM control chip sends the card 3.3V voltage, reset signal, clock signal, and repeat the above step 4 .

It can be seen from the above that the embodiment of the present invention provides an information card identification circuit, including: a card holder, an N×1 selection switch, N information card control chips, and a controller; the card holder is used to load an information card, and the The N×1 selection switch is used to connect the information card loaded on the deck with one of the N information card control chips according to the control signal input by the controller; the N information cards The control chip is used to control N types of information cards in a one-to-one correspondence; the controller is used to detect whether there is an information card loaded on the card holder, and when it is detected that an information card is loaded on the card holder, the The N×1 selection switch inputs M control signals until the controller determines that the information card matches the information card control chip currently connected to the information card after receiving the response data, and terminates sending The control terminal sends a control signal. In this way, in the information card identification circuit provided by the embodiment of the present invention, after the user loads the information card into the card slot, the controller sequentially sends control signals to the selection switch to make the selection switch switch between the information card and the information card control chip. Connect until the information card is connected with the matching information card control chip. For the user, there is no need to worry about the error of the information card, which improves the user experience and solves the problem that the existing users confuse the SIM card interface and the smart card interface, resulting in wrong card insertion. question.

On the other hand, the embodiment of the present invention also provides a terminal. As shown in FIG. 4 , the terminal may include at least one information card identification circuit 10 described above.

Wherein, the terminal may be: a set-top box and other communication equipment supporting multiple cards; the information card identification circuit 10 is the same as the information card identification circuit described in Embodiment 1, and will not be repeated here.

It should be noted that each information card identification circuit can carry the same information card, or can carry different information cards, so as to realize the sharing or multiplexing design of the information cards. In addition, each information card identification circuit may include a controller, or multiple information card identification circuits may share the same controller, which is not limited in this embodiment of the present invention.

It can be known from the above that the embodiment of the present invention provides a terminal, including at least one information card identification circuit. Each information card identification circuit includes: a deck, N×1 selection switch, N information card control chips, and a controller; the deck is used for loading information cards, and the N×1 selection switch is used for The control signal input by the controller communicates the information card loaded on the deck with one of the N information card control chips; the N information card control chips are used for one-to-one corresponding control N types of information cards; the controller is used to detect whether there is an information card loaded in the card holder, and when it is detected that an information card is loaded in the card holder, input M pieces to the N×1 selection switch in sequence control signals until the controller, after receiving the response data, determines that the information card matches the information card control chip currently connected to the information card, and then terminates sending the control signal to the control terminal. In this way, in the terminal provided by the embodiment of the present invention, after the user loads the information card into the card slot, the controller in the information card identification circuit sequentially sends control signals to the selection switch, so that the selection switch switches between the information card and the information card control. The connection between the chips until the information card is connected with the matching information card control chip. For the user, there is no need to worry about the error of the information card, which improves the user experience and solves the problem of confusion between the SIM card interface and the smart card interface for existing users. Card error problem.

The above is only a specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Anyone skilled in the art can easily think of changes or substitutions within the technical scope disclosed in the present invention. Should be covered within the protection scope of the present invention. Therefore, the protection scope of the present invention should be based on the protection scope of the claims.

Claims (6)

1. An information card identification circuit, characterized in that it comprises: card holder, N × 1 selector switch, N information card control chips, and a controller; said N is an integer greater than or equal to 2; said N × 1 The selection switch includes: a control terminal, a common terminal, and N selection terminals, the control terminal is connected to the controller, the common terminal is connected to the first terminal of the deck, and the N selection terminals are respectively connected to The N information card control chips are connected; the controller is connected to the second end of the deck and the N information card control chips; Wherein, the card holder is used for loading information cards; The information card is configured to send response data to the information card control chip; The information card control chip is configured to receive the response data and send the response data to the controller after it is determined to be connected to the information card; The controller is used to detect whether the information card is loaded on the deck, and when it is detected that the information card is loaded on the deck, sequentially output to the control terminal of the N×1 selection switch Control signals, until the controller determines that the information card matches the information card control chip currently connected to the information card after receiving the response data, and then terminates sending the control signal to the control terminal; The N×1 selection switch is used for connecting the information card loaded on the deck with one of the N information card control chips according to the control signal received from the control terminal. 2. The information card identification circuit according to claim 1, wherein the controller is configured to output control signals to the control terminals of the N×1 selection switch in turn, specifically, the controller is configured to: Outputting a first control signal to the control terminal of the N×1 selection switch, the first control signal is used to instruct the N×1 selection switch to connect the common terminal with the first selection terminal, and the first selection The end is connected with the first information card control chip; determining whether the control chip of the information card matches the first information card; If it matches, stop outputting the control signal to the control terminal of the N×1 selection switch; if not, send a second control signal to the N×1 selection switch, and the second control signal is used to indicate the The N×1 selection switch connects the common terminal with the second selection terminal, and the second selection terminal is connected with the second information card control chip. 3. The information card identification circuit according to claim 2, wherein the controller is used to determine whether the information card matches the first information card control chip, specifically, the controller is used to: Sending indication messages to the first information card control chip in sequence until receiving the response data returned by the first information card control chip, terminating sending indication messages to the first information card control chip; Instructing the first information card control chip to send a power supply signal, a reset signal and a clock signal to the information card; Obtain attribute information of the information card; the attribute information is used to identify the information card; Querying the preset information card control relationship table; the information card control relationship table is used to store: the corresponding relationship between the information card control chip and the information card controlled by the information card control chip; If the information card corresponds to the first information card control chip, then determine that the information card matches the first information card control chip; If the information card does not correspond to the first information card control chip, it is determined that the information card does not match the first information card control chip. 4. The information card identification circuit according to claim 3, wherein the controller is used to send instruction messages to the first information card control chip in turn, specifically, the controller is used to: Send a first indication message to the first information card control chip according to a preset power supply sequence, the first indication message is used to instruct the first information card control chip to send a first power supply signal and a reset signal to the information card and clock signal; If the response data returned by the first information card control chip is not received within the preset time, a second indication message is sent to the first information card control chip, and the second indication message is used to indicate the The first information card control chip sends a second power supply signal, a reset signal and a clock signal to the information card. 5. The information card identification circuit according to any one of claims 1 to 4, wherein the card holder is provided with: a card in-position detection circuit connected to the controller; The controller is used to detect whether the information card is loaded on the deck, specifically, the controller is used to: According to the voltage value of the card presence detection circuit, it is determined whether the information card is loaded in the card holder. 6. A terminal, characterized by comprising at least one information card identification circuit according to any one of claims 1-5.