JP2004021351A - Ic card and its controlling method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a multifunction type IC card which prevents a signal from colliding with a host and maintains a high response to the host, and also provide a method for controlling the same. <P>SOLUTION: The IC card is provided with a function unit having a host interface part and a function operating part. The host interface part is provided with a command decoder that stores a first command group comprising commands processable by the function unit and a second command group comprising commands processable by another function unit, outputs a first search result after it searches whether a reception command from the host belongs to the first command group, and outputs a second search result after it searches whether the reception command belongs to the second command group; a response generating part which generates a response to the reception command; and an adjustment part which controls the response generating part in accordance with the first and the second search results. <P>COPYRIGHT: (C)2004,JPO

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to an IC card and a control method thereof.
[0002]
[Prior art]
In recent years, small, large-capacity, high-speed memory cards have been used in personal computers (personal computers), digital cameras, audio players, mobile phones, PDAs (Personal digital assistants), car navigation systems, and the like.
Furthermore, recently, I / Os equipped with functions other than the above-described memory functions (for example, a network connection function such as wireless communication based on the Bluetooth (registered trademark) standard, a measurement function based on a GPS (Global Positioning System), etc.) are provided. IC cards have also appeared.
[0003]
The I / O IC card of Conventional Example 1 has one host interface unit (hereinafter, “interface” is abbreviated as “I / F”) and one or more host interfaces connected to the host I / F unit. A function module. A host such as a personal computer and the IC card of the first conventional example inserted into the host perform master / slave type communication using the host as a master and the IC card as a slave. The host I / F receives a command from the host, selects a function module to execute the command, and transmits the command to the selected function module. The function module performs processing according to the command, and returns a response to the host I / F unit. The host I / F transmits a response to the host.
[0004]
The IC card of Conventional Example 1 appropriately processes a command transmitted from a host and returns an appropriate response to all commands.
The IC card plays a role of adding a function desired by the user to the host device. Therefore, with the diversification of market needs, a multi-function IC card (multi-function module card) having any combination of various functions (especially having a memory function and an I / O function) has been developed and supplied to the market. Is required.
[0005]
The multifunctional IC card of Conventional Example 2 has a configuration in which functional modules (including functional units) are connected in parallel to a bus line with a host device. FIG. 6 shows a configuration of a multifunctional module card (multifunctional IC card) of Conventional Example 2.
In FIG. 6, a multi-function module card 601 is connected via a bus line 103 to an input / output unit 102 of a host 101 which is a host device such as a personal computer. The host 101 and the multi-function module card 601 perform master / slave type communication in which the host 101 is a master and the multi-function module card 601 is a slave.
[0006]
The multifunctional module card 601 has a functional unit 611 and a functional unit 621 mounted thereon. The functional unit 611 and the functional unit 621 are connected to the bus line 103 in parallel.
In this example, the functional unit 611 performs memory access, and the functional unit 621 performs I / O processing with the digital camera.
[0007]
The function unit 611 has a host I / F unit 612 and a function module 613. The function unit 621 has a host I / F unit 622 and a function module 623.
The host I / F units 612 and 622 of the functional unit perform interface processing with the host.
The function module 613 performs a memory access process, and the function module 623 performs an I / O process with a digital camera.
[0008]
Commands transmitted from the host 101 to the functional units mounted on the multi-function module card 601 are received by the host I / F units 612 and 622 of the functional units 611 and 621.
The host I / F units 612 and 622 analyze the received command (received command). The functional units 611 and 621 perform processing according to the analysis result (information such as a command number (indicating the type of the command) included in the received command).
Also, a response to the received command is transmitted to the host 101.
[0009]
Each functional unit returns a response to the host in the following manner.
(1) If the received command is a command that can be processed by the functional unit and the host 101 does not request the processing result, the functional unit returns a response (for example, ACK meaning affirmative) to the host 101.
(2) If the received command is a command that can be processed by the functional unit and the host 101 requests the processing result, the functional unit sends a response to the host 101 and the processing result (for example, the function module 613 reads out the memory from the memory). Data).
(3) If the received command is a command that cannot be processed by the functional unit, no response is made.
[0010]
For example, when the received command is a command for a data read request to the functional unit 611, the functional module 613 of the functional unit 611 reads data from a nonvolatile memory (for example, a flash memory) according to the command, and returns a response and the read data. Is returned to the host 101 via the host I / F unit 612.
Bus line 103 includes a command / response line and a data line. Commands from the host 101 and responses from the functional units are transmitted through command / response lines. Depending on the type of the request command, data from the host or the functional unit may be transmitted through a command / response line or transmitted through a data line.
[0011]
Further, after receiving the command, the multifunction module card according to the second conventional example must return a response to the host 101 within a predetermined time defined by specifications.
[0012]
[Problems to be solved by the invention]
In the multifunction module card of the second conventional example, the command that can be processed by the functional unit 611 and the command that can be processed by the functional unit 621 do not overlap, and the command transmitted by the host 101 is either one of the functional units 611 and 621. As long as the commands that can be processed are limited, the host and the multifunction module card of the second conventional example operate without any problem.
[0013]
However, for example, if the received command is a command that cannot be processed by any of the plurality of functional units, no response is returned from the multi-function module card to the host. If the host outputs the command and does not receive a response within a predetermined time, it determines that communication with the IC card has been interrupted. Generally, once communication is interrupted, transmission of a predetermined command from the host to the IC card and exchange of predetermined information between the host and the IC card must be executed from the beginning to recover the communication again. (The required procedure differs depending on the communication protocol.) That is, if the IC card does not respond to a command from the host, smooth communication between the two is prevented.
[0014]
Instead of (3) of Conventional Example 2, the following protocol (3A) can be executed.
(3A) When the received command is a command that cannot be processed by the functional unit, a response (for example, NACK) meaning that all the functional units reject the response to the command to the host (the command is invalid). return it.
In (1), (2) or (3A), when a plurality of functional units synchronously send back the same response (eg, ACK or NAK) (eg, synchronous transmission), the host is transmitted from the plurality of functional units. Can read the response.
[0015]
However, when a plurality of functional units return different responses to one command (for example, in response to a memory data transmission request command, one functional unit (memory module) returns ACK and another functional unit (for example, If the wireless communication module returns a NACK), the responses from the plurality of functional units collide with each other on the bus line to destroy data, and the host cannot read those responses.
[0016]
Also, even if the response timing of each functional unit is adjusted to avoid collision of a plurality of responses (assuming that protocol compatibility can be ensured), if the response contents of both functional units are different. However, the host cannot identify a plurality of functional units in the same card due to the specification, and therefore cannot recognize which functional unit has returned which response. The host cannot correctly recognize the contents of the plurality of responses and perform the processing normally, and cannot control the multi-function module card 601 correctly.
[0017]
A method of assigning a unique address to each functional unit (host I / F unit) of the IC card is also conceivable. However, according to such a method, in communication between the host and each functional unit, it is necessary to add a source address and a destination address to a command and a response and transmit the command and response. Causes a decrease in For an IC card having only a small and inexpensive single function module (generally, a single function type IC card occupies a majority of IC cards sold) and a host to which only such an IC card can be connected. However, it is not preferable to cope with a complicated communication protocol because it increases costs and power consumption.
[0018]
If the communication protocol between the host and the single-function IC card that transmits and receives commands and responses without adding the source address and the destination address is already standardized, each function for the multi-function IC card If a unique address is assigned to the module, compatibility between the single-function IC card and the multi-function IC card is lost.
[0019]
The present invention solves the above problems, and allows the host to correctly respond to each functional unit without interrupting communication and without colliding with responses from a plurality of functional units mounted on one IC card. It is an object of the present invention to provide an IC card capable of recognizing the information and a control method thereof.
An object of the present invention is to provide an IC card capable of accurately controlling a plurality of functional units mounted on one IC card with a simple configuration and a control method thereof.
[0020]
The present invention is directed to a multi-function IC card that communicates smoothly (without confusion) with a host while maintaining compatibility with communication performed by a single-function IC card with the host, and control thereof. The aim is to provide a method.
SUMMARY OF THE INVENTION An object of the present invention is to provide a multi-function IC card that performs smooth communication with a host while maintaining the feature that a single-function IC card communicates with a host in a simple manner, and a control method thereof. I do.
[0021]
According to the present invention, an IC card having a plurality of functions can be realized only by connecting functional units in parallel. There is no need to develop new elements (including hardware and software) for the interface with the host according to the combination of a plurality of functional units, so that the speed of product development of IC cards having a plurality of functions is increased, Development costs can be reduced. Thereby, the cost of the IC card can be reduced. An object of the present invention is to provide a multifunctional IC card that can be developed in a short period of time at low cost, and a control method thereof.
Further, the present invention provides a multi-function IC card capable of controlling each functional unit in an optimum manner according to a plurality of modes in which a method of responding to a command is different between a host and a multi-function IC card, and a control thereof. The aim is to provide a method.
[0022]
[Means for Solving the Problems]
In order to solve the above problems, the present invention has the following configurations.
According to the first aspect of the present invention, there is provided a host interface unit for receiving a command from a host device, a function operation unit for performing processing in accordance with the command (hereinafter, referred to as a “reception command”) received by the host interface unit, And a plurality of functional units each having the following. The host interface unit includes a first command group including commands that can be processed by the functional unit and a second command group including commands that can be processed by other functional units. And searches whether the received command belongs to the first command group, outputs a first search result as a search result, and determines whether the received command belongs to the second command group. And a command decoder that outputs a second search result as a search result, and a response generator that generates a response to the received command When an IC card and having a an arbitration unit to control the response generation unit in response to the first search result and the second search results.
[0023]
The invention according to claim 2 is characterized in that the host interface unit detects a state of another functional unit, and the arbitration unit adds a state of the other functional unit to a condition for controlling the response generation unit. The IC card according to claim 1.
The “state of the functional unit” means, for example, that an initialization command is received from the host, the “initialization is completed” state of the functional unit, or “initialization command is not received from the host. State has not been completed. " After the completion of the initialization, the functional unit can process a normal command from the host (a command other than initialization or the like, which controls an operation specific to the functional unit).
[0024]
According to a third aspect of the present invention, the command decoder stores the first command group, searches whether or not a received command belongs to the first command group, and obtains a first command which is a search result. A first command decoder for outputting a search result, and storing the second command group, and searching whether or not a received command belongs to the second command group; a second search result as a search result And a second command decoder that outputs the first command decoder and the second command decoder.
[0025]
According to a fourth aspect of the present invention, there is provided a host interface unit that receives a command from a host device, a function operation unit that performs processing in accordance with the command (hereinafter, referred to as a “reception command”) received by the host interface unit, The host interface unit stores a first command group consisting of commands that can be processed by the functional unit, and determines whether a received command belongs to the first command group. A command decoder that outputs a first search result as a search result, a response generation unit that generates a response to the received command, and the host interface unit of another functional unit that outputs the first search result. And the received command transmitted from the host interface unit of the other functional unit is transmitted to the other functional unit. The first search result (hereinafter, the first search result output by the host interface unit of another functional unit is a search result indicating whether or not the host interface unit belongs to the first command group). And an arbitration unit that controls the response generation unit according to the first search result and the second search result. Card.
[0026]
In the invention according to claim 5, the arbitration unit further outputs the state of the own function unit to the arbitration unit of another function unit, and inputs the state of another function unit from the arbitration unit of the other function unit. 5. The IC card according to claim 4, wherein a state of the other functional unit is added to a condition for controlling the response generation unit. 6.
[0027]
The invention according to claim 6, wherein the host interface unit responds if the received command belongs to the first command group, and responds if the received command belongs to the second command group. If the received command does not belong to any of the first command group and the second command group, the host interface unit of a predetermined functional unit responds. An IC card according to any one of claims 1 to 5.
[0028]
The invention according to claim 7, wherein the host interface unit responds if the received command belongs to the first command group, and responds if the received command belongs to the second command group. If the received command does not belong to any of the first command group and the second command group, no response is made and a flag indicating that the received command is invalid is set, and the next received command is set. Is a command belonging to the first command group, responding to the received command, sending information indicating that the received command is invalid to the host, and resetting the flag. An IC card according to any one of claims 1 to 5.
“Received command is invalid” means that the received command is a command that cannot be processed by all functional units of the IC card.
[0029]
The invention according to claim 8 is that, if the received command is a command belonging to both the first command group and the second command group, the host interface unit of the predetermined functional unit responds. An IC card according to claim 6 or claim 7.
[0030]
The invention according to claim 9, wherein the host interface unit transmits a command belonging to the second command group next to a received command not belonging to any of the first command group and the second command group. 8. The IC card according to claim 7, wherein the flag is reset when no response is received.
[0031]
The invention according to claim 10 is characterized in that after the received command that does not belong to any of the first command group and the second command group, the received command is assigned to any of the first command group and the second command group. If a command to which the command belongs also is received, the host interface unit of the predetermined functional unit responds to the received command and sends information to the host that the previous received command is invalid, and resets the flag, 8. The IC card according to claim 7, wherein the host interface unit of a functional unit other than a predetermined functional unit does not respond and resets the flag.
[0032]
The invention according to claim 11, wherein a response is returned when a command belonging to the first command group is received, and a response is not returned when a command not belonging to the first command group is received. And a second interface mode that always returns a response to a received command. In the first interface mode, the second interface mode functions as the IC card according to claim 7, and Is an IC card that functions as the IC card according to claim 6.
[0033]
According to a twelfth aspect of the present invention, there is provided a host interface unit that receives a command from a host device, a function operation unit that performs processing according to the command (hereinafter, referred to as a “reception command”) received by the host interface unit, A method of controlling an IC card having a plurality of functional units each having a function of searching for whether a received command belongs to a first command group consisting of commands that can be processed by the functional unit. A first search result as the search result is output, and whether or not the received command belongs to a second command group consisting of commands that can be processed by another functional unit is searched, and the second command as the search result is searched. A command search step of outputting a search result, and in each of the function units, a command search step according to the first search result and the second search result. Is a control method of an IC card and having a a response generation step of generating a response to the received command.
[0034]
The invention according to claim 13 further comprises a state detecting step of detecting a state of another functional unit, wherein the state of the other functional unit is added to a condition for generating a response in the response generating step. A method for controlling an IC card according to claim 12.
[0035]
According to a fourteenth aspect of the present invention, there is provided a host interface unit that receives a command from a host device, a function operation unit that performs processing according to the command (hereinafter, referred to as a “reception command”) received by the host interface unit, A method of controlling an IC card having a plurality of functional units, each of which has a function of searching for whether a received command belongs to the first command group consisting of commands that can be processed by the functional unit. A command search step of outputting a first search result as a search result, and in each functional unit, transmitting the first search result to the host interface unit of another functional unit; The received command transmitted from the host interface unit is transmitted to the host interface of another functional unit. The first search result (hereinafter, the first search result output by the host interface unit of another functional unit is a “second search”) which is a search result as to whether or not the first command group belongs to the first command group. And a response generating step of generating a response to the received command in each functional unit according to the first search result and the second search result. And a control method for an IC card.
[0036]
According to a fifteenth aspect of the present invention, there is provided a status output step of outputting information including a status of a self-functional unit to a host interface unit of another functional unit, and transmitting a status of another functional unit from a host interface unit of the other functional unit. 15. The control of the IC card according to claim 14, further comprising: a state input step of inputting information including the information, wherein the state of the other functional unit is added to a condition for generating a response in the response generating step. Is the way.
[0037]
In the invention according to claim 16, the response generating step is a first response step for responding if the received command belongs to the first command group, and the received command belongs to the second command group. A second response step that does not respond if it is a command; and a host interface of a predetermined functional unit if the received command does not belong to any of the first command group and the second command group. The IC card control method according to any one of claims 12 to 15, further comprising a third response step in which the unit responds.
[0038]
The invention according to claim 17, wherein the response generation step is a first response step for responding if the received command belongs to the first command group, and the received command belongs to the second command group. A second response step of not responding if the command is a command, and no response if the received command does not belong to any of the first command group and the second command group and the received command is invalid A fourth response step of setting a flag indicating the first command group, if the command received next to the fourth response step belongs to the first command group, responds to the received command, A fifth response step of sending information to the host that is invalid, and resetting the flag. 2 is a control method for an IC card according to any one of claims 15.
[0039]
The invention according to claim 18, wherein in the response generation step, if the received command is a command belonging to both the first command group and the second command group, the host interface of a predetermined functional unit The control method for an IC card according to claim 16 or claim 17, further comprising a sixth response step in which the unit responds.
[0040]
In the invention according to claim 19, if the response generation step is a command belonging to the second command group, the command received after the fourth response step does not respond, the flag is reset. The method according to claim 17, further comprising a seventh response step.
[0041]
20. The invention according to claim 20, wherein the response generating step is a command in which a command received next to the fourth response step belongs to both the first command group and the second command group. The host interface unit of the predetermined functional unit responds to the received command and sends information to the host that the previous received command is invalid, and resets the flag, and resets the flag to a function other than the predetermined functional unit. 18. The method according to claim 17, further comprising an eighth response step of resetting the flag without responding to the host interface unit of the functional unit.
[0042]
The invention according to claim 21, wherein a response is returned when a command belonging to the first command group is received, and a response is not returned when a command not belonging to the first command group is received. And a second interface mode that always returns a response to a received command. In the first interface mode, the control method according to claim 17 is executed, and the second interface mode is executed. Is a method for controlling an IC card, which executes the control method according to claim 16.
[0043]
The present invention has an effect that a host can control a plurality of functional units without causing communication confusion and can realize a multifunctional IC card capable of recognizing a response from each functional unit and a control method thereof.
[0044]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, an embodiment that specifically shows a preferred embodiment for carrying out the present invention will be described with reference to the drawings.
[0045]
<< Example 1 >>
First Embodiment A multifunctional module card (multifunctional IC card) according to a first embodiment of the present invention and a control method thereof will be described with reference to FIGS.
FIG. 1 is a block diagram showing the configuration of the multi-function module card according to the first embodiment of the present invention.
In FIG. 1, reference numeral 101 denotes a host (in this embodiment, a personal computer), and reference numeral 111 denotes a multi-function module card. The multi-function module card 111 is connected to the input / output unit 102 of the host 101 via a bus line 103.
[0046]
The host 101 and the multi-function module card of the first embodiment inserted in the host perform master / slave type communication in which the host 101 is a master and the multi-function module card 111 is a slave. The bus line 103 of the first embodiment is the same as the bus line 103 of the second conventional example. The device of the first embodiment performs synchronous communication (the host 101 supplies a clock), but may perform asynchronous communication.
[0047]
The multi-function module card 111 has a bus control unit 121, a host I / F unit (A) 131, a function module (A) 141, a host I / F unit (B) 151, and a function module (B) 161.
The host I / F (A) 131 and the functional module (A) 141 corresponding thereto constitute a functional unit (a memory unit in the embodiment).
The host I / F (B) 151 and the corresponding functional module (B) 161 constitute a functional unit (a digital camera unit in the embodiment).
[0048]
The bus control unit 121 converts the command, data, and clock transmitted from the input / output unit 102 of the host 101 into all host I / F units (the host I / F unit (A) 131 and the host I / F unit (B)). 151) is transmitted to the input / output units 132 and 152, and the logical product of the response and data output from each of the input / output units 132 and 152 is transmitted to the input / output unit 102 of the host 101 by the clock transmitted from the host. I do.
[0049]
The internal bus between the bus control unit 121 and the input / output units 132 and 152 becomes HIGH when all of these input / output units have high impedance. As described later, in the multi-function module card 111 of the first embodiment, control is performed such that only one host I / F unit responds to one command. Responses and data output from the input / output units 132 and 152 are transmitted to the input / output unit 102 of the host 101 via the bus control unit 121. The bus control unit 121 is substantially an input / output buffer.
The bus control unit 121 may be deleted, and the input / output units 132 and 152 of each functional unit may be directly connected in parallel to the bus line 103 from the host.
[0050]
The host I / F unit (A) 131 and the host I / F unit (B) 151 perform I / F processing between the host 101 and the functional module (A) 141 and the functional module (B) 161.
In this embodiment, the function module (A) 141 is a function module dedicated to a memory that accesses a readable and writable nonvolatile memory. The functional module (B) 161 performs I / O processing with the digital camera.
The host I / F (A) 131 is a host I / F for a memory module, and the host I / F (B) 151 is a host I / F for an I / O. The host I / F (B) 151 includes not only the function module (B) 161 which is a module for a digital camera, but also a plurality of different function modules (for example, a wireless communication module of Bluetooth (registered trademark) standard, a GPS module, and the like). ) Can also be connected.
Further, another host I / F unit can be connected in parallel with the host I / F unit (A) 131 and the host I / F unit (B) 151.
[0051]
The host I / F unit (A) 131 includes an input / output unit 132, a first command decoder 133, a functional module I / F unit 134, a second command decoder 135, an arbitration unit 136, and a response generation unit 137.
The host I / F unit (B) 151 includes an input / output unit 152, a first command decoder 153, a functional module I / F unit 154, a second command decoder 155, an arbitration unit 156, and a response generation unit 157.
The host I / F unit (A) 131 and the host I / F unit (B) 151 are connected to each other via a state monitoring signal path 171 in addition to the connection via the bus control unit 121.
[0052]
The host I / F unit (A) 131 and the host I / F unit (B) 151 have different commands that can be specifically processed, but the following description of the host I / F unit is common to both. Thus, the host I / F (A) 131 will be described as an example. In the description, each code of the host I / F unit (A) 131 is replaced with each code of the host I / F unit (B) 151, and each code of the host I / F unit (B) 151 is replaced with the host I / F. The host I / F unit (B) 151 can be understood by substituting each symbol of the F unit (A) 131.
In the host I / F unit (A) 131, the input / output unit 132 receives commands and data from the host 101, responds to the host 101, and transmits data. The input / output unit 132 outputs the received command to the first command decoder 133 and the second command decoder 135.
[0053]
For example, when the input / output unit 132 receives a command accompanied by data such as a data write request from the host 101, the input / output unit 132 writes data accompanying the command (for example, data written by the functional module (A) 141 into the memory) in the functional module I / F unit The data is transmitted to the functional module (A) 141 via the communication module 134. For example, when the input / output unit 132 receives a command requesting a processing result such as a data read request from the host 101, the input / output unit 132 transmits the processing result (for example, data read from the memory by the functional module (A) 141) to the host 101. I do.
[0054]
The first command decoder 133 stores a first command group including commands that can be processed by the functional units of the host I / F unit (A) 131 and the functional module (A) 141, and stores the received command in the first command group. Is analyzed in the range of the command group. If the received command belongs to the first command group, the content of the received command is transmitted to the functional module (A) 141 through the functional module I / F unit 134, and the functional module (A) 141 performs processing according to the content. I do. The response generator 137 returns a response to the received command. Further, the first command decoder 133 searches whether or not the received command belongs to the first command group, and outputs a first search result as a search result to the arbitration unit 136.
[0055]
The second command decoder 135 stores a second command group including commands that can be processed by the functional units of the host I / F unit (B) 151 and the functional module (B) 161. Is analyzed in the range of the command group. The second command decoder 135 searches whether or not the received command belongs to the second command group, and outputs a second search result as a search result to the arbitration unit 136.
The first command decoder 133 of the host I / F unit (A) 131 is the same block as the second command decoder 155 of the host I / F unit (B) 151, and the host I / F unit (B) 151 The first command decoder 153 is the same block as the second command decoder 135 of the host I / F unit (A) 131. By making the blocks common, the development efficiency of the IC card can be improved.
[0056]
The function module I / F unit 134 performs an I / F process between the host I / F unit (A) 131 and the function module (A) 141. As a result of analyzing the command by the first command decoder 133, if the received command is a command that can be processed by the functional unit, the content of the command is transmitted to the functional module (A) 141 via the functional module I / F unit 134. Is output. The result processed by the functional module (A) 141 is output to the response generating unit 137 via the functional module I / F unit 134.
[0057]
The arbitration unit 136 includes a first search result output from the first command decoder 133, a second search result output from the second command decoder 135, a bus mode (described later), and other functional units (host I / F). The response generator 137 (response to the received command) is controlled based on the state (described later) of the unit (B) 151 and the function module (B) 161).
[0058]
Each functional unit receives an initialization command from the host and performs initialization processing of the functional unit. After the completion of the initialization processing, the functional unit can process a normal command (a command for controlling an operation specific to the functional unit, for example, a data read request or the like) from the host.
In the present embodiment, the states of the functional units indicate two states: a state in which the initialization processing has been completed and a state in which the initialization processing has not been completed. Incomplete state ".
[0059]
When the functional unit including the host I / F unit (A) 131 is in the initialization completed state, the host I / F unit (A) 131 transmits a HIGH-level signal through the state monitoring signal path 171 to the host I / F unit (A). B) When the function unit including the host I / F unit (A) 131 is in an uncompleted initialization state, the LOW level signal is transmitted to the host I / F unit (B) 151 via the state monitoring signal path 171. To be transmitted.
Similarly, when the functional unit including the host I / F (B) 151 is in the initialization completed state, the host I / F (B) 151 transmits a HIGH-level signal through the state monitoring signal path 171 to the host I / F. When the function unit including the host I / F unit (B) 151 is in an uncompleted initialization state, the LOW-level signal is transmitted through the state monitoring signal path 171 to the host I / F unit (B) 151. A) Transmit to 131.
[0060]
The status monitoring signal path 171 allows each host I / F unit to know the status of other functional units (initialization completed status / initialization incomplete status).
Each host I / F unit can respond to a normal command from the host if the functional unit is in the initialization completed state, and does not respond to a normal command from the host if the functional unit is in the uncompleted state. .
[0061]
The bus modes are two modes in communication on the bus line 103 with the host 101, managed by the host I / F unit. The bus mode includes a first I / F mode and a second I / F mode.
In the first I / F mode, the IC card returns a response to the host when a command that any of the functional units of the IC card can process is received, and all the functional units of the IC card do not process. In this mode, a response is not returned to the host when a possible command (illegal command) is received. When receiving the command that can be processed next, the IC card that has received the invalid command responds to the command and sends information to the host that the previous command was invalid.
[0062]
The second I / F mode is a mode in which the IC card always returns a response to a command from the host 101. The IC card returns a response (for example, NACK indicating that the command is invalid) to the host even when receiving a command that cannot be processed by the functional unit of the IC card.
[0063]
The feature of the first embodiment of the present invention is that the second embodiment includes a second command decoder and an arbitration unit which are not included in the related art.
[0064]
The response generation unit 137 generates a response to the host 101 according to the control signal from the arbitration unit 136 and the analysis result of the first command decoder 133 (response differs according to the type of command), and sends the response to the input / output unit 132. Output. In addition, the response generation unit 137 receives the data output by the functional module (A) 141 and outputs the data to the input / output unit 132. A specific response method will be described below.
[0065]
Next, operations of the host I / F unit (A) 131 and the host I / F unit (B) 151 when receiving a command from the host 101 will be described.
2 and 3 are flowcharts showing operations of the host I / F unit (A) 131 and the host I / F unit (B) 151 after receiving a command from the host 101. Here, the host I / F (A) 131 will be described as an example. The host I / F unit (B) 151 can be understood by replacing each code of the host I / F unit (A) 131 in the description with each code of the host I / F unit (B) 151. .
First, it is checked whether the input / output unit 132 has received a command from the host 101. If a command has been received from the host 101, the process proceeds to step S202. In other cases, the process exits (step S201).
[0066]
Next, the first command decoder 133 and the second command decoder 135 analyze the received command and output a first search result and a second search result, respectively.
The arbitration unit 136 determines whether the current bus mode (the mode of communication with the host) is the first I / F mode (only when the IC card can process a received command (type)). (Step for returning a response to the host) regardless of whether or not the IC card can process the received command (type). S202).
If the bus mode is the “second I / F mode”, the process proceeds to step S203; otherwise (the first I / F mode), the process proceeds to step S301 (FIG. 3).
[0067]
[Processing in Second I / F Mode]
The arbitration unit 136 determines whether the received command is a command for the host I / F unit (own function unit) based on the first search result (step S203). If a first search result indicating that the received command belongs to the first command group is obtained, it is determined that the received command is for the host I / F unit (host I / F unit (A) 131). If a first search result indicating that the received command does not belong to the first command group is obtained, it is determined that the received command is not a command for the host I / F unit (A) 131.
[0068]
If the command is for the host I / F (A) 131 (dedicated to the host I / F, or a command common to the host I / F and another host I / F), the first command decoder 133 Outputs command content (command) information to the functional module (A) 141 via the functional module I / F unit 134. The functional module (A) 141 performs processing according to the command (step S204).
At this time, if the state of the host I / F unit (A) 131 is an initialization incomplete state, processing is performed only when the received command is an initialization command.
[0069]
Next, the arbitrating unit 136 determines whether the received command is a command for another host I / F unit (host I / F unit (B) 151) based on the second search result (step S205). ). If a second search result indicating that the received command belongs to the second command group is obtained, it is determined that the received command is a command for the host I / F unit (B) 151. If a second search result indicating that the received command does not belong to the second command group is obtained, it is determined that the received command is not a command for the host I / F (B) 151.
If the received command is not a command for the host I / F (B) 151, the process proceeds to step S206.
[0070]
Next, the arbitration unit 136 determines whether the host I / F (A) 131 needs to respond to the host (step S206).
Whether the host I / F can respond to the host depends on the contents of the received command, the state of the host I / F (own function unit), and the other host I / F (other function unit). And the value of the response priority flag.
The “response priority flag” is held by each host I / F unit. When this flag is ON, “response priority is present”, and when it is OFF, “response priority is not present”. The value of the response priority flag is a predetermined fixed value.
[0071]
The arbitration unit 136 determines the response priority flag, the search result of the first command decoder 133, the search result of the second command decoder 135, the host I / F unit (A) 131, and the host I / F unit (B) 151. It is determined whether or not the own host I / F unit (host I / F unit (A) 131) can respond to the host 101 based on the state of (1).
[0072]
FIG. 4 is a table (response determination table) showing the presence / absence of a response from the host I / F unit to the host 101 and the above-described conditions for determining the response.
The response determination table has four sections according to the content of the received command.
“Command of own host I / F unit” indicates that the command is dedicated to the own host I / F unit (own function unit). “Command of other host I / F unit” indicates that the command is dedicated to another host I / F unit (other functional unit). “Common command” indicates that the command is common to the host I / F and other host I / Fs. The “undefined command” indicates that the command is not compatible with both the host I / F and other host I / Fs.
[0073]
In the leftmost item, “the state of the host I / F unit” indicates the state of the function unit. “○” indicates the initialization completed state, and “×” indicates the initialization not completed state.
The “state of another host I / F unit” indicates a state of another functional unit. “○” indicates the initialization completed state, and “×” indicates the initialization not completed state.
“Priority of own host I / F unit” indicates the state of the response priority flag. “○” indicates that the response right has been initially set (ON), and “×” indicates that the response right has not been set (OFF).
In “response presence / absence”, “」 ”indicates that the host I / F unit returns a response to the host, and“ × ”indicates that the other host I / F unit returns a response. It indicates that.
[0074]
In step S206, whether the host I / F (A) 131 needs to respond to the host is determined based on the response determination table in FIG. In the process of step S206, since the received command is dedicated to the host I / F unit, the leftmost section (own host I / F) of the highest order item (contents of the received command) in the response determination table. It is sufficient to make a judgment only with the command of the section.
When the host I / F unit (A) 131 needs to send a response to the host, the arbitration unit 136 requests the response generation unit 137 to generate a response to the host 101. The response generated by the response generation unit 137 is transmitted to the host 101 via the input / output unit 132 (Step S207), and the process ends.
[0075]
If the host I / F unit (A) 131 does not need to send a response to the host, the host I / F unit (A) 131 ends the process without returning a response to the host (the host I / F unit (B) ) 151 responds to the host (step S212).
In step S205, when the received command is also a command for the host I / F unit (B) 151 (the received command is a command common to the host I / F unit (A) 131 and the host I / F unit (B) 151). In the case, the host I / F unit (A) 131 determines whether it is necessary to send a response to the host (step S208).
[0076]
In the process of step S208, since the received command is a command common to the host I / F unit (A) 131 and the host I / F unit (B) 151, the highest item (contents of the received command) in the response determination table of FIG. ) May be determined only in the third section (common command) from the left.
If the host I / F unit (A) 131 needs to send a response to the host, the process of step S207 is performed, and this process ends.
If the host I / F unit (A) 131 does not need to send a response to the host, the host I / F unit (A) 131 ends the process without returning a response to the host (the host I / F unit (B) ) 151 responds to the host (step S212).
[0077]
In step S203, if the received command is not a command for the host I / F unit (A) 131, the arbitration unit 136 determines that the received command is for another host I / F unit (host I / F unit (B) 151). It is determined whether the command is a command (step S209). If the command is for the host I / F (B) 151, the arbitration unit 136 determines whether the host I / F (A) 131 needs to respond to the host (step S210).
[0078]
In the process of step S210, since the received command is a command dedicated to the host I / F unit (B) 151, the second category from the left (the contents of the received command) of the top item (contents of the received command) in the response determination table of FIG. The determination may be made based only on commands of other host I / F units).
If the host I / F unit (A) 131 needs to send a response to the host, the process of step S207 is performed, and this process ends.
If the host I / F unit (A) 131 does not need to send a response to the host, the host I / F unit (A) 131 ends the process without returning a response to the host (the host I / F unit (B) ) 151 responds to the host (step S212).
[0079]
If the received command is not a command for the host I / F (B) 151 in step S209, the arbitration unit 136 determines whether the host I / F (A) 131 needs to respond to the host. (Step S211).
In the process of step S211, since the received command is a command that is not supported by the host I / F unit (A) 131 and the host I / F unit (B) 151, the topmost item ( The determination may be made only in the fourth section (undefined command) from the left among the received command contents.
If the host I / F unit (A) 131 needs to send a response to the host, the process of step S207 is performed, and this process ends.
If the host I / F unit (A) 131 does not need to send a response to the host, the host I / F unit (A) 131 ends the process without returning a response to the host (the host I / F unit (B) ) 151 responds to the host (step S212).
[0080]
[Processing in First I / F Mode (FIG. 3)]
Next, a process in the case where it is determined in S202 that the current bus mode is the first I / F mode will be described with reference to FIG.
The arbitration unit 136 determines whether the received command is a command for the host I / F unit (host I / F unit (A) 131) based on the analysis result (first search result) of step S202 (step S202). S301).
When the command is a command for the host I / F unit (dedicated to the host I / F unit or a common command), the command content (command) information is sent to the function module (A) 141 via the function module I / F unit 134. Is output. The functional module (A) 141 performs processing according to the instruction (step S302).
At this time, if the state of the host I / F unit (A) 131 is an initialization incomplete state, processing is performed only when the received command is an initialization command.
[0081]
Next, the arbitrating unit 136 determines whether or not the received command is also a command for another host I / F unit (host I / F unit (B) 151) based on the second search result (step S303). . If the command is not a command for the host I / F unit (B) 151, the arbitration unit 136 determines whether the host I / F unit (A) 131 needs to respond to the host (step S304).
In the process of step S304, since the received command is a command dedicated to the host I / F unit (A) 131, the leftmost section (self) of the top item (contents of the received command) of the response determination table in FIG. The determination may be made only by the command of the host I / F unit).
[0082]
However, in the first I / F mode, a response to the host is not returned when the processing cannot be performed by the own host I / F unit and another host I / F unit. In the state where the initialization is not completed (the position of “x” in the response determination table of FIG. 4), no response is returned.
[0083]
In step S304, when the host I / F unit (A) 131 needs to respond to the host, the arbitration unit 136 requests the response generation unit 137 to generate a response to the host 101. The response generated by the response generation unit 137 is transmitted to the host 101 via the input / output unit 132 (Step S305). At this time, when the invalid flag is ON (when the previous received command is invalid), the response generation unit 137 sends a predetermined bit (invalid command of 48 bits) of the response (command length is 48 bits). Flag bit). As a result, the host 101 can recognize that the immediately preceding command is an invalid command (a command that cannot be processed by any host I / F unit).
[0084]
In the first I / F mode, the improper flag means that all the host I / F units on the multi-function module card (the host I / F unit (A) 131 and the host I / F unit (A) 131 in the first embodiment) receive a command from the host. I / F unit (B) 151) is a flag that is turned on when both cannot be processed, and is managed by each host I / F unit. The invalid flag is cleared (OFF) when any one of the host I / F units receives a command that can be processed.
Therefore, when a plurality of host I / F units are operating, each illegal flag indicates the same value.
The arbitration unit 136 turns the fraud flag OFF (if ON) (step S306), and the process ends.
[0085]
In step S304, if the host I / F unit (A) 131 does not need to respond to the host (if the host I / F unit (A) 131 is in the initialization incomplete state), the arbitration unit 136 sets the invalid flag. Is set to ON (step S312), and this processing ends. (Do not respond to the host.)
[0086]
In step S303, when the received command is also a command for another host I / F unit (host I / F unit (B) 151) (the received command is the host I / F unit (A) 131 and the host I / F unit) (B) In the case of a common command in 151), the arbitration unit 136 determines whether the host I / F unit (A) 131 needs to send a response to the host (step S307).
In the process of step S307, since the received command is a command common to the host I / F unit (A) 131 and the host I / F unit (B) 151, the highest order item (of the received command) in the response determination table of FIG. Only the third category (common command) from the left in (contents) needs to be determined.
However, as in step S304, no response is returned if the status of the host I / F unit is not yet initialized (the location of “x” in the response determination table of FIG. 4).
[0087]
If it is determined in step S307 that the host I / F unit (A) 131 needs to respond to the host, steps S305 (response processing to the host) and S306 (clearing the invalid flag) are executed, and the processing ends. I do. Steps S305 and S306 have already been described.
If it is determined in step S307 that the host I / F unit (A) 131 does not need to respond to the host, the arbitration unit 136 outputs the host I / F unit (A) based on the input signal from the state monitoring signal path 171. B) It is determined whether or not 151 is in the initialization completed state (step S308). If the host I / F (B) 151 is in the initialization completed state, the host I / F (B) 151 responds to the host 101 (step S309). The arbitration unit 136 turns the fraud flag OFF (if ON) (step S306), and the process ends.
[0088]
If the host I / F unit (B) 151 is in the initialization-uncompleted state in step S308, the arbitration unit 136 turns the fraud flag ON (step S312), and ends this processing. (Do not respond to the host.)
If the received command is not a command for the own host I / F unit (host I / F unit (A) 131) in step S301, the arbitrating unit 136 determines whether the received command is another host I / F unit based on the second search result. It is determined whether the command is for the F section (host I / F section (B) 151) (step S310). If the command is for the host I / F unit (B) 151, the arbitration unit 136 sets the host I / F unit (B) 151 to the initialization completed state based on the input signal from the state monitoring signal path 171. Is determined (step S311).
[0089]
If the host I / F (B) 151 is in the initialization completed state in step S311, the host I / F (B) 151 responds to the host 101 (step S309). The arbitration unit 136 turns the fraud flag OFF (if ON) (step S306), and the process ends.
If the host I / F (B) 151 is in the initialization-uncompleted state in step S311, the arbitration unit 136 turns on the invalid flag (step S312), and ends this processing. (Do not respond to the host.)
[0090]
In the first I / F mode, when a command that cannot be processed by all host I / F units on the IC card is received, the invalid flag is turned on (step S312). Next, when receiving and responding to a command that can be processed by the host I / F unit, a predetermined bit (invalid flag bit) of the response command is set (set to 1) and the previous command is invalid. The fact that there is is transmitted to the host (step S305). Then, the unauthorized flag is turned off (step S306).
Further, after receiving a command that cannot be processed by all host I / F units on the IC card, a command that can be processed by any one of the host I / F units is received, and the other host I / F units respond. In this case (step S309), the unauthorized flag is turned off (step S306).
[0091]
Although the IC card according to the first embodiment has two functional units, the IC card may have three or more functional units. For example, when the IC card has three functional units, the second command decoder has the same number of second command groups as the number of other functional units, and outputs the same number of second search results. Each second command group is composed of commands that can be processed by other corresponding host I / F units. Each second search result indicates whether the received command belongs to one second command group.
Each of the host I / F units is connected to the other two host I / F units via a state monitoring signal path, and the state of the two other host I / F units (the state of the functional unit) is changed. You can know. When one other host I / F unit is in the uninitialized state, the arbitrating unit does not use the second search result of the other host I / F unit in the uninitialized state. Otherwise, the IC card having three or more functional units is the same as the IC card of the first embodiment.
[0092]
<< Example 2 >>
Second Embodiment A multifunction module card (multifunction IC card) according to a second embodiment of the present invention and a control method thereof will be described with reference to FIG.
FIG. 5 is a block diagram showing a configuration of the multi-function module card according to the second embodiment of the present invention.
In FIG. 5, reference numeral 101 denotes a host (in this embodiment, a personal computer) and 511 a multi-function module card. The multi-function module card 511 is connected to the input / output unit 102 of the host 101 via the bus line 103.
The host 101 and the multi-function module card of the second embodiment inserted in the host perform master / slave type communication in which the host is the master and the multi-function module card 511 is the slave.
[0093]
The multifunction module card 511 (FIG. 5) according to the second embodiment and the multifunction module card 111 (FIG. 1) according to the first embodiment have a difference in a method of controlling transmission of a response to a host. Other points are the same. Components having the same functions as those in the first embodiment are denoted by the same reference numerals as those in FIG. 1, and description thereof will be omitted.
The multifunction module card 511 includes a bus control unit 121, a host I / F unit (A) 531, a function module (A) 141, a host I / F unit (B) 551, and a function module (B) 161.
The host I / F (A) 531 and the functional module (A) 141 corresponding thereto constitute a functional unit (a memory unit in the embodiment).
The host I / F unit (B) 551 and the corresponding functional module (B) 161 constitute a functional unit (in the embodiment, a digital camera unit).
[0094]
The host I / F unit (A) 531 includes an input / output unit 132, a first command decoder 133, a function module I / F unit 134, an arbitration unit 533, and a response generation unit 137.
The host I / F (B) 551 includes an input / output unit 152, a first command decoder 153, a function module I / F 154, an arbitration unit 553, and a response generation unit 157. The arbitration unit 533 of the host I / F unit (A) 531 and the arbitration unit 553 of the host I / F unit (B) 551 are provided with a communication path 561 between the host I / F units, which is a transmission path capable of transmitting and receiving data. Are connected to each other.
[0095]
The multi-function module card according to the second embodiment differs from the multi-function module card according to the first embodiment in that the multi-function module card does not have the second command decoder, but has a communication path 561 between host I / F sections instead. Otherwise, they are identical.
The input / output unit, the first command decoder, the functional module I / F unit, and the response generation unit have the same functions as those in the first embodiment, and thus description thereof will be omitted.
[0096]
Upon receiving the first search result from the first command decoder 133 (153), the arbitration unit 533 (553) transmits the first search result to another host I / F via the host I / F unit communication path 561. It notifies the arbitration unit 553 (533) of the F section.
In the host I / F of the second embodiment, the first search result of the first command decoder sent from the arbitration unit of another host I / F is the first search result of the host I / F of the first embodiment. 2 corresponds to a second search result of the second command decoder. In the first embodiment, the status of the other host I / F unit (initialization completed / initialization not completed) is used. This is because the arbitration unit of the other host I / F unit transmits the first command decoder. If the analysis result is sent, it is in the initialization completed state, and if it is not sent, it can be handled by determining that the initialization is incomplete.
[0097]
Also, the arbitration unit 533 (553) arbitrates information on the state (initialization completed / initialization not completed) of the host I / F unit (A) 531 ((B) 551) by another host I / F unit. The signal may be output to the unit 553 (533). In this case, the arbitration unit 533 (553) determines the status of other functional units (initialization completed / initialization not completed) from this information.
[0098]
The arbitration unit 533 (553) outputs the first search result of the first command decoder 133 (153), the first search result of the first command decoder 153 (133) of another host I / F unit, and the other The response generator 137 (157) is controlled based on the status of the functional unit and the status of the bus mode (described in the first embodiment). The response generator 137 (157) responds to the received command according to the control.
[0099]
【The invention's effect】
According to the present invention, an IC that allows a host to correctly recognize a response from each functional unit without interrupting communication and without colliding with responses from a plurality of functional units mounted on one IC card. An advantageous effect that the card and its control method can be realized is obtained.
According to the present invention, there is obtained an advantageous effect that an IC card and a control method thereof that can accurately control a plurality of functional units mounted on one IC card with a simple configuration can be realized.
[0100]
According to the present invention, it is possible to realize a multi-function type IC card capable of smoothly communicating with a host while maintaining compatibility with communication performed by a single-function IC card with a host and a control method thereof. An advantageous effect is obtained.
ADVANTAGE OF THE INVENTION According to this invention, while maintaining the characteristic that a single-function IC card communicates with a host by a simple method, the multifunctional IC card which communicates smoothly with a host and the control method thereof can be realized. Effects can be obtained.
[0101]
According to the present invention, an IC card having a plurality of functions can be realized only by connecting functional units in parallel. ADVANTAGE OF THE INVENTION According to this invention, the advantageous effect of being able to implement | achieve the multifunctional IC card which can be developed at low cost in a short time and the control method thereof can be obtained.
Further, according to the present invention, there is provided a multifunctional IC card capable of controlling each functional unit in an optimal manner according to a plurality of modes in which a method of responding to a command is different between a host and a multifunctional IC card. The advantageous effect that the control method can be realized is obtained.
[Brief description of the drawings]
FIG. 1 is a block diagram illustrating an internal configuration of a multi-function module card according to a first embodiment of the present invention.
FIG. 2 is a flowchart illustrating a response control operation (including a second I / F mode) of the multi-function module card according to the first embodiment of the present invention.
FIG. 3 is a flowchart illustrating a response control operation of the multi-function module card in the first I / F mode according to the first embodiment of the present invention.
FIG. 4 is a table for determining “the presence or absence of a response” in the first embodiment of the present invention.
FIG. 5 is a block diagram illustrating an internal configuration of a multi-function module card according to a second embodiment of the present invention.
FIG. 6 is a block diagram illustrating a configuration of an IC card having a plurality of functional units according to Conventional Example 2.
[Explanation of symbols]
101 Host
102, 132, 152 Input / output unit
103 bus line
111, 511, 601 Multi-function module card
121 Bus control unit
131,531 Host I / F (A)
133, 153 First command decoder
134, 154 Function module I / F section
135, 155 second command decoder
136, 156, 533, 553 Arbitration unit
137, 157 Response generator
141 Function Module (A)
151, 551 Host I / F (B)
161 Function module (B)
171 Signal path for status monitoring
561 Communication path between host I / F
611, 621 functional unit
612, 622 Host I / F section
613, 623 Function module

Claims (21)

It has a plurality of functional units each having a host interface unit for receiving a command from a host device, and a function operation unit for performing processing in accordance with the command (hereinafter, referred to as a “received command”) received by the host interface unit. And
The host interface unit includes:
A first command group consisting of commands that can be processed by the functional unit and a second command group consisting of commands that can be processed by other functional units are stored, and whether a received command belongs to the first command group is determined. And outputs a first search result as a search result, searches whether the received command belongs to the second command group, and outputs a second search result as the search result. A command decoder;
A response generation unit that generates a response to the received command;
An arbitration unit that controls the response generation unit according to the first search result and the second search result;
An IC card comprising: The host interface unit detects a state of another functional unit, and the arbitration unit adds the state of the other functional unit to a condition for controlling the response generation unit.
The IC card according to claim 1, wherein: The command decoder,
A first command decoder that stores the first command group, searches whether a received command belongs to the first command group, and outputs a first search result as a search result;
A second command decoder that stores the second command group, searches whether a received command belongs to the second command group, and outputs a second search result as a search result;
The IC card according to claim 1, wherein the IC card has: It has a plurality of functional units each having a host interface unit for receiving a command from a host device, and a function operation unit for performing processing in accordance with the command (hereinafter, referred to as a “received command”) received by the host interface unit. And
The host interface unit includes:
A first command group consisting of commands that can be processed by the functional unit is stored, it is searched whether a received command belongs to the first command group, and a first search result as a search result is output. A command decoder;
A response generation unit that generates a response to the received command;
The first search result is transmitted to the host interface unit of another functional unit, and the received command transmitted from the host interface unit of another functional unit is the first command of the host interface unit of another functional unit. The first search result (hereinafter, the first search result output by the host interface unit of another functional unit is referred to as a "second search result") as a search result of whether or not the command group belongs to the command group. And an arbitration unit that controls the response generation unit according to the first search result and the second search result;
An IC card comprising: The arbitration unit further outputs the state of the own function unit to the arbitration unit of another function unit, and inputs the state of another function unit from the arbitration unit of the other function unit, and outputs the state of the other function unit. Is added to the condition for controlling the response generator,
The IC card according to claim 4, wherein: The host interface unit includes:
If the received command is a command belonging to the first command group, reply
If the received command is a command belonging to the second command group, it does not respond,
If the received command does not belong to any of the first command group and the second command group, the host interface unit of a predetermined functional unit responds.
The IC card according to any one of claims 1 to 5, wherein: The host interface unit includes:
If the received command is a command belonging to the first command group, reply
If the received command is a command belonging to the second command group, it does not respond,
If the received command does not belong to any of the first command group and the second command group, it does not respond and sets a flag indicating that the received command is invalid. If the command belongs to the first command group, it responds to the received command, sends information indicating that the received command is invalid to the host, and resets the flag.
The IC card according to any one of claims 1 to 5, wherein: 7. The host interface unit of a predetermined functional unit responds if the received command is a command belonging to both the first command group and the second command group. 7. The IC card according to 7. The host interface unit does not respond when a command belonging to the second command group is received next to a received command not belonging to any of the first command group and the second command group, The IC card according to claim 7, wherein the flag is reset. When a command belonging to any of the first command group and the second command group is received next to a received command not belonging to any of the first command group and the second command group,
The host interface unit of the predetermined functional unit responds to the received command and sends information to the host that the previous received command is invalid, and resets the flag,
The IC card according to claim 7, wherein the host interface unit of a functional unit other than a predetermined functional unit does not respond and resets the flag. A first interface mode in which a response is returned when a command belonging to the first command group is received, and a response is not returned when a command not belonging to the first command group is received;
A second interface mode that always returns a response to the received command;
Has,
7. An IC card functioning as the IC card according to claim 7 in the first interface mode, and functioning as the IC card according to claim 6 in the second interface mode. It has a plurality of functional units each having a host interface unit for receiving a command from a host device, and a function operation unit for performing processing in accordance with the command received by the host interface unit (hereinafter, referred to as a “reception command”). A method of controlling an IC card,
In each functional unit, a search is performed to determine whether the received command belongs to a first command group consisting of commands that can be processed by the functional unit, and a first search result as a search result is output. A command search step of searching whether or not a functional unit belongs to a second command group consisting of processable commands and outputting a second search result as a search result;
A response generating step of generating a response to the received command in each functional unit according to the first search result and the second search result;
A control method for an IC card, comprising: Further comprising a state detecting step of detecting a state of another functional unit,
Adding the state of the other functional unit to a condition for generating a response in the response generating step;
The method for controlling an IC card according to claim 12, wherein: It has a plurality of functional units each having a host interface unit for receiving a command from a host device, and a function operation unit for performing processing in accordance with the command received by the host interface unit (hereinafter, referred to as a “reception command”). A method of controlling an IC card,
A command search step of, in each function unit, searching whether a received command belongs to the first command group consisting of commands that can be processed by the function unit, and outputting a first search result as a search result; ,
In each functional unit, the first search result is transmitted to the host interface unit of another functional unit, and the received command transmitted from the host interface unit of the other functional unit is transmitted to the host interface of another functional unit. The first search result (hereinafter, the first search result output by the host interface unit of another functional unit is a “second search result”) that is a search result as to whether or not the first command group belongs to the first command group. ) Is input.)
A response generating step of generating a response to the received command in each functional unit according to the first search result and the second search result;
A control method for an IC card, comprising: A status output step of outputting information including the status of the own functional unit to the host interface unit of another functional unit,
A status input step of inputting information including the status of the other functional unit from the host interface unit of the other functional unit,
Adding the state of the other functional unit to a condition for generating a response in the response generating step;
The method of controlling an IC card according to claim 14, wherein: The response generating step includes:
A first response step of responding if the received command belongs to the first command group;
A second response step of not responding if the received command is a command belonging to the second command group;
If the received command is a command that does not belong to any of the first command group and the second command group, a third response step in which the host interface unit of a predetermined functional unit responds;
The method of controlling an IC card according to any one of claims 12 to 15, comprising: The response generating step includes:
A first response step of responding if the received command belongs to the first command group;
A second response step of not responding if the received command is a command belonging to the second command group;
A fourth response step of not responding if the received command does not belong to any of the first command group and the second command group and setting a flag indicating that the received command is invalid;
If the command received after the fourth response step is a command belonging to the first command group, it responds to the received command and sends information to the host that the previous received command is invalid, and A fifth response step of resetting the flag;
The method of controlling an IC card according to any one of claims 12 to 15, comprising: A sixth response step to which the host interface unit of a predetermined functional unit responds if the received command is a command belonging to both the first command group and the second command group; The method for controlling an IC card according to claim 16, wherein the method comprises: The response generating step may include a seventh response step of resetting the flag without responding if the command received next to the fourth response step belongs to the second command group. The method for controlling an IC card according to claim 17, wherein: The response generating step includes:
If the command received after the fourth response step is a command belonging to any of the first command group and the second command group,
The host interface unit of the predetermined functional unit responds to the received command and sends information to the host that the previous received command is invalid, and resets the flag,
The host interface unit of a functional unit other than a predetermined functional unit does not respond, and resets the flag.
The method according to claim 17, further comprising an eighth response step. A first interface mode in which a response is returned when a command belonging to the first command group is received, and a response is not returned when a command not belonging to the first command group is received;
A second interface mode that always returns a response to the received command;
Has,
The control method according to claim 17, wherein the control method according to claim 17 is executed in the first interface mode, and the control method according to claim 16 is executed in the second interface mode. .

Images