Patent Abstract:
A method and an apparatus for supporting a self-destruction function in a baseband modem are provided. Aspects of the present disclosure are to address at least the above-mentioned problems and/or disadvantages and to provide at least the advantages described below. Accordingly, an aspect of the present disclosure is to provide a self-destruction method and apparatus in which a self-impossible state is autonomously entered if the baseband modem of a receiving terminal which supports mobile communication is necessary. Another aspect of the present disclosure is to provide a method and apparatus for deleting information stored in memory when a command is received over a mobile communication network in which a baseband modem has been constructed and then entering a self-impossible state so that the terminal is not recovered although it is booted up again.

Full Description:
CROSS-REFERENCE TO RELATED APPLICATION(S) 
     This application claims the benefit under 35 U.S.C. §119(e) of a U.S. Provisional application filed on Jul. 4, 2013 in the U.S. Patent and Trademark Office and assigned Ser. No. 61/843,012, and under 35 U.S.C. §119(a) of a Korean patent application filed on Mar. 5, 2014 in the Korean Intellectual Property Office and assigned Serial number 10-2014-0025835, the entire disclosure of each of which is hereby incorporated by reference. 
    
    
     TECHNICAL FIELD 
     The present disclosure relates to a method and apparatus for supporting a self-destruction function in a baseband modem. 
     BACKGROUND 
     With the development of mobile communication technology, a user stores various pieces of information in a terminal and manages the pieces of information. Accordingly, if the terminal is lost, problems attributable to personal information distribution and the reuse of the terminal may occur. 
     In order to solve the problems, if a user sends a specific command to a lost terminal through a base station, the lost terminal autonomously deletes data stored in the lost terminal&#39;s flash memory in order to protect the user&#39;s personal information. Although the data stored in the flash memory is deleted, all chips included in the terminal may not be made in a fully impossible state because all the functions of the chips remain intact. If the functions of chips remain intact, a finder who picks up a lost terminal may recover the lost terminal because the lost terminal may be booted up and resell/reuse the lost terminal. In order to prevent such a problem, there is a need for technology in which chips are made in a fully impossible state in some cases. 
     The above information is presented as background information only to assist with an understanding of the present disclosure. No determination has been made, and no assertion is made, as to whether any of the above might be applicable as prior art with regard to the present disclosure. 
     SUMMARY 
     Aspects of the present disclosure are to address at least the above-mentioned problems and/or disadvantages and to provide at least the advantages described below. Accordingly, an aspect of the present disclosure is to provide a self-destruction method and apparatus in which a self-impossible state is autonomously entered if the baseband modem of a receiving terminal which supports mobile communication is necessary. 
     Another aspect of the present disclosure is to provide a method and apparatus for deleting information stored in memory when a command is received over a mobile communication network in which a baseband modem has been constructed and then entering a self-impossible state so that the terminal is not recovered although it is booted up again. 
     In accordance with an aspect of the present disclosure, a self-destruction method of a baseband modem is provided. The method includes sending a request for supplying power to a self-destruction unit to a power management unit when a command for performing the self-destruction is received from a base station and controlling the self-destruction unit to output a signal corresponding to a specific bit value. The signal output by the self-destruction unit is used to block a clock supplied from a TCXO to the baseband modem through a logical operation with a signal output by the TCXO. 
     An apparatus in accordance with an aspect of the present disclosure includes a baseband modem configured to support self-destruction, a power management unit configured to supply power to the baseband modem, and a TCXO configured to supply a clock to the baseband modem. The baseband modem includes a self-destruction unit configured to output a signal corresponding to a specific bit value for blocking the clock through a logical operation with a signal output by the TCXO and a control unit configured to send a request for supplying power to the self-destruction unit to the power management unit when a command for performing the self-destruction is received from a base station and to control the self-destruction unit to output a signal corresponding to a specific bit value. 
     Other aspects, advantages, and salient features of the disclosure will become apparent to those skilled in the art from the following detailed description, which, taken in conjunction with the annexed drawings, discloses various embodiments of the present disclosure. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
       The above and other aspects, features, and advantages of certain embodiments of the present disclosure will be more apparent from the following description taken in conjunction with the accompanying drawings, in which: 
         FIG. 1  is a block diagram showing the structure of a known apparatus including a baseband modem according to an embodiment of the present disclosure; 
         FIG. 2  is a block diagram showing the structure of an apparatus including a baseband modem according to an embodiment of the present disclosure; 
         FIG. 3  is a flowchart illustrating a method of supporting the self-destruction function of the baseband modem according to an embodiment of the present disclosure; and 
         FIG. 4  is a block diagram showing the structure of an apparatus including a baseband modem according to another embodiment of the present disclosure. 
     
    
    
     The same reference numerals are used to represent the same elements throughout the drawings. 
     DETAILED DESCRIPTION 
     The following description with reference to the accompanying drawings is provided to assist in a comprehensive understanding of various embodiments of the present disclosure as defined by the claims and their equivalents. It includes various specific details to assist in that understanding but these are to be regarded as merely exemplary. Accordingly, those of ordinary skill in the art will recognize that various changes and modifications of the various embodiments described herein may be made without departing from the scope and spirit of the present disclosure. In addition, descriptions of well-known functions and constructions may be omitted for clarity and conciseness. 
     The terms and words used in the following description and claims are not limited to the bibliographical meanings, but, are merely used by the inventor to enable a clear and consistent understanding of the present disclosure. Accordingly, it should be apparent to those skilled in the art that the following description of various embodiments of the present disclosure is provided for illustration purpose only and not for the purpose of limiting the present disclosure as defined by the appended claims and their equivalents. 
     It is to be understood that the singular forms “a,” “an,” and “the” include plural referents unless the context clearly dictates otherwise. Thus, for example, reference to “a component surface” includes reference to one or more of such surfaces. 
     Various embodiments of the present disclosure are described in association with a terminal. The terminal may also be named as a mobile, a remote terminal, a mobile device, a user terminal, a wireless communication device, a user agent, a user device, or User Equipment (UE). The terminal may be a cellular phone, a Personal Digital Assistant (PDA), a handheld device having a wireless access ability, a computing device. Alternatively another processing device connected to a wireless modem. 
     It is to be noted that technical terms used in this specification are used to describe only specific various embodiments and are not intended to limit the scope of the present disclosure. Furthermore, the technical terms used in this specification should be construed as having meanings that are commonly understood by those skilled in the art to which the present disclosure pertains unless especially defined as different meanings in this specification and should not be construed as having excessively comprehensive meanings or excessively reduced meanings. 
     Furthermore, an expression of the singular number used in this specification includes an expression of the plural number unless clearly defined otherwise in the context. In this specification, terms, such as “comprise” and “include”, should not be construed as essentially including several elements or several steps described in the specification. 
     Hereinafter, some various embodiments of the present disclosure are described with reference to the accompanying drawings. Furthermore, in describing the various embodiments of the present disclosure, a detailed description of known functions or constructions related to the present disclosure will be omitted if it is deemed that such description would make the gist of the present disclosure unnecessarily vague. Furthermore, terms to be described later are defined by taking the functions of various embodiments of the present disclosure into consideration, and may be different according to the operator&#39;s intention or usage. Accordingly, the terms should be defined based on the overall contents of the specification. 
       FIG. 1  is a block diagram showing the structure of a known apparatus including a baseband modem according to an embodiment of the present disclosure. 
     Referring to  FIG. 1 , a known apparatus  100  is configured to include a baseband modem  110 . The baseband modem  110  may also be named as a baseband processor. The baseband modem  110  may perform a function for controlling the voice and data communication of the apparatus  100  and perform major functions for input and output between the apparatus  100  and a user using operation/control functions. 
     A control unit  111  manages an overall operation by controlling the elements of the baseband modem  110 . An Inter-Integrated Circuit (I2C)  112  controls the supply of power by controlling a device external to the baseband modem  110 , for example, a Power Management IC (PMIC)  120  under the control of the control unit  111 . A Phase-Locked Loop (PLL)  113  is a frequency synthesizer and is configured to operate as a control loop for continuously supplying an output signal having the same phase and size as an input signal. The PLL  113  receives a source clock from an external Temperature-Compensated crystal Oscillator (TCXO)  130  and provides the control unit  111  with a clock having a specific cycle. The control unit  111  may perform a normal operation in response to power supplied by the PMIC  120  via the I2C  112  and a clock supplied by the TCXO  130  via the PLL  113 . 
     The PMIC  120  supplies required power to each of the elements of the apparatus  100 . The PMIC  120  may have a function for managing a total amount of power consumed by the apparatus  100  depending on implementations. 
     The TCXO  130  operates as a source for supplying a frequency for the apparatus  100 . The TCXO  130  supplies a reference frequency and a source clock to the baseband modem  110  and RF unit  150  of the apparatus  100 . The TCXO  130  may adopt temperature compensation techniques of various methods in order to prevent the deterioration of characteristics of the apparatus  100  that is attributable to a temperature change and a change in the frequency of other surrounding environments while the apparatus  100  operates. 
     A memory unit  140  may store data (e.g., an Operation System (OS) that enables the apparatus  100  to be booted up) for the apparatus  100 . In various embodiments, the memory unit  140  may be provided separately from the baseband modem  110  as shown in  FIG. 1  or may be provided within the baseband modem  110 . Alternatively, the memory unit  140  may be provided both inside and outside the baseband modem  110 . The memory unit  140  may include at least one of a flash memory type, a hard disk type, a multimedia card micro type, card type memory (e.g., SD or XD memory), Random Access Memory (RAM), Static Random Access Memory (SRAM), Read-Only Memory (ROM), Electrically Erasable Programmable Read-Only Memory (EEPROM), Programmable Read-Only Memory (PROM), magnetic memory, a magnetic disk, and an optical disk, but is not limited thereto. 
     The RF unit  150  performs data communication with the outside of the apparatus  100  under the control of the control unit  110 . The RF unit  150  may perform data communication with, for example, a base station. The RF unit  150  may modulate an external signal into a signal of a low frequency band (i.e., a baseband) that may be processed by the baseband modem  110  or may modulate a signal of a low frequency, processed by the baseband modem  110 , into a signal of a high frequency and send the signal of a high frequency. 
       FIG. 2  is a block diagram showing the structure of an apparatus including a baseband modem according to an embodiment of the present disclosure. 
     Referring to  FIG. 2 , an apparatus  200  in accordance with an embodiment of the present disclosure is configured to include a baseband modem  210 . The baseband modem  210  is configured to include a control unit  211 , an I2C  212 , and a PLL  213 . 
     The control unit  211  manages an overall operation by controlling the elements of the baseband modem  210 . In accordance with an embodiment of the present disclosure, when a self-destruction command is received from a base station through a HUNT character  218 , the control unit  211  may request a PMIC  220  to supply power to an eFuse cell  215  by controlling the I2C  212 . Furthermore, the control unit  211  may control an eFuse writer  214  so that a specific bit of the eFuse cell  215  is set to a bit value for controlling the baseband modem  210  in a self-destruction state. The control unit  211  may manage and delete data stored in a memory unit  240  by controlling a Static Memory Controller (SMC)  217 . A more detailed operation of the control unit  211  is described later. 
     The I2C  212  controls the supply of power by controlling a device external to the baseband modem  210 , for example, the PMIC  220  under the control of the control unit  212 . The PLL  213  is a frequency synthesizer and is configured to operate as a control loop for continuously supplying an output signal having the same phase as an input signal. In accordance with an embodiment of the present disclosure, the PLL  213  receives a signal from an eFuse logic circuit  216  as a source clock and supplies the control unit  211  with a clock having a specific cycle. The control unit  211  may perform a normal operation in response to power supplied by the PMIC  220  via the I2C  212  and a clock supplied by the TCXO  230  via the PLL  213 . The baseband modem  210  in accordance with an embodiment of the present disclosure is configured to include the eFuse writer  214  and the eFuse cell  215 . 
     The eFuse writer  214  sets a specific bit, stored in the eFuse cell  215 , to a bit value for controlling the baseband modem  210  in a self-destruction state under the control of the control unit  211 . In one embodiment, when a signal for controlling the self-destruction state is received from the control unit  211 , the eFuse writer  214  may set a specific bit of the eFuse cell  215  as ‘1’. The bit value for controlling the baseband modem  210  in the self-destruction state may be previously set by the manufacturer of the apparatus  200  and may be, for example, a binary value of 1 bit, such as ‘1’. The specific bit value set in the eFuse cell  215  is a one-off value and thus may not be externally changed after it is set. 
     The eFuse cell  215  externally outputs a specific bit value set by the eFuse writer  214 . In one embodiment, if a specific bit value of the eFuse cell  215  is set as ‘1’ by the eFuse writer  214 , the eFuse cell  215  may output a signal corresponding to the bit value ‘1’. 
     The signal output by the eFuse cell  215  is input to a first AND gate  216   a  for receiving a signal output by the eFuse cell  215  and a signal output by an eFuse ENA  260  as its input. The first AND gate  216   a  performs an AND operation based on the signal output by the eFuse cell  215  and the signal output by the eFuse ENA  260  and outputs a signal corresponding to a result of the operation. The signal output by the first AND gate  216   a  is input to a NOT gate  216   b . The NOT gate  216   b  inverts the input signal and outputs an inverted signal. The inverted signal output by the NOT gate  216   b  is input to a second AND gate  216   c  for receiving the signal output by the NOT gate  216   b  and a signal output by the TCXO  230  as its input. The second AND gate  216   c  performs an AND operation based on the signal output by the NOT gate  216   b  and the signal output by the TCXO  230  and outputs a signal corresponding to a result of the operation. The signal output by the second AND gate  213   c  is supplied to the PLL  213 , thus acting as a clock for the control unit  211 . 
     The eFuse cell  215  may be supplied with power from the PMIC  220 . To this end, the control unit  211  may control the PMIC  220  through the I2C  212  so that the PMIC  220  supplies power to the eFuse cell  215 . The PMIC  220  may additionally include an LDO_eFuse  221  for supplying power to the eFuse cell  215 . 
     The baseband modem  210  in accordance with an embodiment of the present disclosure is configured to further include the SMC  217  and the HUNT character  218 . 
     The SMC  217  operates as an interface for controlling the memory unit  240  provided inside or outside the baseband modem  210 . In various embodiments, if an additional interface for controlling the memory unit  240  is not necessary, the SMC  217  may be omitted. In accordance with an embodiment of the present disclosure, the SMC  217  may perform control for deleting data stored in the memory unit  240  under the control of the control unit  211 . 
     The HUNT character  218  performs a function for detecting a self-destruction command received through an RF unit  250  and sending the self-destruction command to the control unit  211 . When the self-destruction command is received from a base station through the RF unit  250 , the HUNT character  218  may detect the self-destruction command and send the self-destruction command to the control unit  211  in an interrupt form. In various embodiments, if the control unit  211  directly detects the self-destruction command, the HUNT character  218  may be omitted. 
     The PMIC  220  supplies required power to each of the elements of the apparatus  200 . The PMIC  220  may control the supply of power in response to a command from the control unit  211  that is received through the I2C  212 . 
     In accordance with an embodiment of the present disclosure, the PMIC  220  may be configured to include the LDO_eFuse  221  for supplying power to the eFuse cell  215 . When a command that supplies power to the eFuse cell  215  is received from the control unit  211  through the I2C  212 , the PMIC  220  supplies power to the eFuse cell  215  through the LDO_eFuse  221 . 
     The TCXO  230  operates as a source for supplying a frequency for the apparatus  200 . The TCXO  230  supplies a reference frequency and a source clock to the baseband modem  210  and RF unit  250  of the apparatus  100 . The TCXO  230  may adopt temperature compensation techniques of various methods in order to prevent the deterioration of characteristics of the apparatus  100  that is attributable to a temperature change and a change in the frequency of other surrounding environments while the apparatus  100  operates. 
     The memory unit  240  may store data (e.g., an OS that enables the apparatus  200  to be booted up) for the apparatus  200 . In various embodiments, the memory unit  240  may be provided separately from the baseband modem  210  as shown in  FIG. 2  or may be provided within the baseband modem  210 . Alternatively, the memory unit  240  may be provided both inside and outside the baseband modem  210 . The memory unit  240  may include at least one of a flash memory type, a hard disk type, a multimedia card micro type, card type memory (e.g., SD or XD memory), Random Access Memory (RAM), Static Random Access Memory (SRAM), Read-Only Memory (ROM), Electrically Erasable Programmable Read-Only Memory (EEPROM), Programmable Read-Only Memory (PROM), magnetic memory, a magnetic disk, and an optical disk. 
     The RF unit  250  performs data communication with the outside of the apparatus  200  under the control of the control unit  210 . The RF unit  250  may perform data communication with, for example, a base station. The RF unit  250  may modulate an external signal into a signal of a low frequency band (i.e., a baseband) that may be processed by the baseband modem  210  or may modulate a signal of a low frequency, processed by the baseband modem  210 , into a signal of a high frequency and send the signal of a high frequency. 
     In accordance with an embodiment of the present disclosure, the RF unit  250  may receive various control commands, for example, the self-destruction command from a base station, modulate the control command into a signal of a low frequency band that may be processed by the baseband modem  210 , and send the signal of a low frequency band to the control unit  211 . 
     The baseband modem  210  in accordance with an embodiment of the present disclosure may be configured to further include an eFuse ENA  260 . The eFuse ENA  260  performs a function for turning on or off whether or not to supply a self-destruction function to the apparatus  200 . The turn-on or -off function for determining whether or not to supply the self-destruction function may be determined in response to a user&#39;s input to the apparatus  200  or a message received from a base station. 
     In order to control the turn-on or -off function, the eFuse ENA  260  outputs a signal to the first AND gate  216   a  connected to the eFuse cell  215 . When the turn-on or -off function for determining whether or not to supply the self-destruction function is determined to be on by the apparatus  200 , the eFuse ENA  260  receives a pull-up signal. When the pull-up signal is received, the eFuse ENA  260  outputs a signal corresponding to the same value set to be identical with a value output by the eFuse cell  215  when the self-destruction command is executed. Accordingly, the self-destruction function in accordance with an embodiment of the present disclosure may be performed because the first AND gate  216   a  outputs a signal corresponding to the same value as that output by the eFuse cell  215  through the AND operation. In contrast, when the turn-on or -off function for determining whether or not to supply the self-destruction function is determined to be off by the apparatus  200 , the eFuse ENA  260  does not receive the pull-up signal. In such a case, when the self-destruction function is performed, the eFuse ENA  260  outputs a signal corresponding to a value different from a value set to be output by the eFuse cell  215 . Accordingly, the self-destruction function in accordance with an embodiment of the present disclosure may not be performed because the first AND gate  216   a  outputs a signal corresponding to a value different from a value output by the eFuse cell  215  through the AND operation. 
     In various embodiments, if the function for turning on or off the self-destruction function is not provided, the eFuse ENA  260  may be omitted. 
     In a state in which the self-destruction function has been controlled so that it has been on and the pull-up signal has been send to the eFuse ENA  260 , when the self-destruction command is received from a base station, the control unit  211  controls the I2C  212  so that power is supplied from the LDO_eFuse  221  to the eFuse cell  215 . If a value for controlling the baseband modem  210  so that it enters the self-destruction state is set as ‘1’, the control unit  211  controls the eFuse writer  214  so that it outputs a signal corresponding to ‘1’ to the eFuse cell  215 . ‘1’ output by the eFuse cell  215  and ‘1’ output by the eFuse ENA  260  are input to the first AND gate  216   a , and the first AND gate  216   a  outputs a signal corresponding to ‘1’ based on a result of its AND operation. The NOT gate  216   b  receives ‘1’ and outputs a signal corresponding to an inverted signal of ‘0’. The TCXO  230  outputs a clock signal, such as ‘101010, . . . ,’ in order to provide a periodic clock. The second AND gate  216   c  performs an AND operation based on ‘0’ output by the NOT gate  216   b  and the clock signal ‘101010, . . . ,’ output by the TCXO  230 . In this case, the second AND gate  216   c  outputs the signal ‘0’ because the NOT gate  216   b  continues to output the signal ‘0’. The PLL  213  sends the signal ‘0’, output by the second AND gate  216   c , to the control unit  211 . As a result, the periodic clock signal send by the TCXO  230  is blocked, and thus the control unit  211  to which the clock signal is not provided, does not normally operate. In accordance with the aforementioned operation, a value set in the eFuse cell  215  may not be changed in response to external input, and the control unit  211  to which a clock is not provided may not perform a normal operation. Accordingly, the baseband modem  210  becomes the self-destruction state. 
     In various embodiments, in order to implement the baseband modem  210 , elements including the eFuse logic circuit  216  may be replaced with other elements or a different structure or may be omitted. For example, if the same results as those of the aforementioned bit operation may be provided, the first AND gate  216   a  and the second AND gate  216   c  may be replaced with an OR gate or an XOR gate. Alternatively, if the same results as those of the aforementioned bit operation may be provided, the NOT gate  216   b  may be omitted. To this end, for example, the structure of an apparatus including a baseband modem in accordance with another embodiment of the present disclosure is described in detail below with reference to  FIG. 4 . 
     A method in which the apparatus  200  including the baseband modem  210  in accordance with an embodiment of the present disclosure performs the self-destruction function of the baseband modem is described below with reference to FIG.  3 . 
       FIG. 3  is a flowchart illustrating a method of supporting the self-destruction function of the baseband modem according to an embodiment of the present disclosure. 
     Referring to  FIG. 3 , the method of supporting the self-destruction function in accordance with an embodiment of the present disclosure is started by supplying the pull-up signal to the eFuse ENA at operation  301 . 
     The apparatus  200  controls the self-destruction function of the baseband modem  210  so that the self-destruction function is in the turn-on state. If the self-destruction function of the baseband modem  210  is controlled so that it is in the turn-off state, the self-destruction function to be described later may not be performed. The function for turning on or off the self-destruction function may be determined in response to a user&#39;s input or a message received from a base station. 
     If the self-destruction function of the baseband modem  210  is controlled so that it is in the turn-on state, the pull-up signal is sent to the eFuse ENA  260  through the control unit  211  of the apparatus  200 . When the pull-up signal is received, the eFuse ENA  260  outputs a signal corresponding to the same value as that set so that the value is output by the eFuse cell  215  when performing the self-destruction function. For example, the eFuse cell  215  may output a signal corresponding to ‘1’. 
     The control unit  211  determines whether or not the self-destruction command has been received from a base station at operation  303 . 
     The RF unit  250  performs data communication with the base station, modulates the signal, received from the base station, into a signal of a baseband, and sends the signal of the baseband to the HUNT character  218 . The HUNT character  218  determines whether or not the self-destruction command has been received from the base station based on the received signal. If, as a result of the determination, it is determined that the self-destruction command has been received, the HUNT character  218  sends the self-destruction command to the control unit  211  in an interrupt form. 
     The self-destruction command may be sent from the base station to the apparatus  200  in a situation in which the self-destruction function is necessary owing to a reason, such as a loss of the apparatus  200 . The self-destruction command is a term for denoting the signal sent from the base station to the apparatus  200  and is only an example. The self-destruction command may also be named as an emasculation command or an impossible-state entry command. Furthermore, the self-destruction command may be transmitted through an existing message format or a newly defined message format. The self-destruction command may be transmitted over a public network or the private network of a service provider which provides network service to the apparatus  200 . A format, a method, etc. in which the self-destruction command is sent are not specially limited. 
     When the self-destruction command is received, the control unit  211  may delete data stored in the memory unit depending on an embodiment of the present disclosure at operation  305 . 
     The control unit  211  sends a command for deleting data stored in the memory unit to the SMC  217 . The SMC  217  initializes the memory unit or sends a command for deleting data stored in the memory unit so that all the data stored in the memory unit is deleted. 
     Thereafter, the control unit  211  performs control so that power is supplied to the eFuse cell  215  through the I2C  212  at operation  307 . The control unit  211  controls the I2C  212  so that the I2C  212  sends a request for the supply of power to the eFuse cell  215  to the PMIC  220 . The I2C  212  requests the supply of power to the eFuse cell  215  from the PMIC  220  under the control of the control unit  211 , and the PMIC  220  controls the LDO_eFuse so that power is supplied to the eFuse cell  215 . 
     Furthermore, the control unit  211  performs control so that a specific bit for the self-destruction function is set in the eFuse cell  215  through the eFuse writer at operation  309 . The control unit  211  controls the eFuse writer so that it writes the specific bit for the self-destruction function in the eFuse cell  215 . For example, the control unit  211  may control the eFuse writer so that it writes a value of ‘1’ in the eFuse cell  215 . 
     When power is supplied to the eFuse cell  215  and a signal corresponding to the value set in the eFuse cell  215  is output according to the aforementioned control, a clock supplied to the control unit  211  is blocked through the eFuse logic circuit. As a result, the clock is not supplied to the control unit  211  according to the aforementioned operation, and thus the control unit  211  enters the self-destruction state because it does not perform a normal operation. 
     For example, when the eFuse cell  215  outputs a signal corresponding to ‘1’ and the eFuse ENA  260  outputs a signal corresponding to ‘1’, the first AND gate  216   a  outputs a signal corresponding to ‘1’ through its AND operation. The NOT gate  216   b  receives the signal corresponding to ‘1’ from the first AND gate  216   a  and outputs a signal corresponding to ‘0’, that is, an inverted signal. The second AND gate  216   c  performs an AND operation based on a periodic clock signal ‘101010, . . . ,’ output by the TCXO  230  and the signal output by the NOT gate  216   b  and continues to output a signal corresponding to ‘0’. The PLL receives the signal from the second AND gate  216   c  and sends the received signal to the control unit  211 . The control unit  211  does not perform a normal operation because it is supplied with a signal corresponding to ‘0’ not a clock signal, thus entering the self-destruction state. 
       FIG. 4  is a block diagram showing the structure of an apparatus including a baseband modem according to another embodiment of the present disclosure. 
     Referring to  FIG. 4 , an apparatus  400  is configured to include a baseband modem  410  in accordance with another embodiment of the present disclosure. The baseband modem  410  is configured to include a control unit  411 , an I2C  412 , and a PLL  213 . A detailed operation of the control unit  411 , the I2C  412 , and the PLL  213  is the same as that described with reference to  FIG. 2 . 
     The baseband modem  410  in accordance with another embodiment of the present disclosure is configured to include a self-destruction unit  414  and a self-destruction logic circuit unit  415 . 
     The self-destruction unit  414  may correspond to the eFuse writer  214  and the eFuse cell  215  in the embodiment of  FIG. 2 . The self-destruction unit  414  outputs a signal corresponding to a specific bit that blocks a clock supplied to the PLL  413  through a specific logical operation with a signal output by a TCXO  430  through a self-destruction logic circuit unit  415 . The specific bit that blocks the clock may be determined depending on a construction of the self-destruction logic circuit unit  415 . Alternatively, the specific bit that blocks the clock may be determined may be previously set when fabricating the apparatus  400 . If the self-destruction unit  414  and the self-destruction logic  415  correspond to the eFuse writer  214 , the eFuse cell  215 , and the eFuse logic circuit  216  of  FIG. 2 , the specific bit that blocks the clock may be ‘1’. 
     The self-destruction logic circuit unit  415  may include a specific logic circuit for blocking the clock supplied to the PLL  413  through a logical operation of a signal output by the self-destruction unit  414  and a clock signal output by the TCXO  430 . The self-destruction logic circuit unit  415  may correspond to the eFuse logic circuit  216  in the embodiment of  FIG. 2 . 
     The self-destruction unit  414  and the self-destruction logic circuit unit  415  may be modified in various forms without departing from the spirit of the present disclosure. 
     The apparatus  400  may be configured to include the TCXO  430 , a memory unit  440 , and an RF unit  450 , which have been described in detail with reference to  FIG. 2 . 
     In accordance with the self-destruction method and apparatus of the baseband modem according to the various embodiments of the present disclosure, information within a specific terminal is deleted and the baseband modem is made in a recovery-impossible state in response to a command transmitted over an existing communication network when the terminal is lost or in an urgent situation. Accordingly, an attempt to information spill and the reuse or resell of a terminal may be blocked. 
     Those skilled in the art to which the present disclosure pertains will appreciate that the present disclosure may be implemented in other detailed forms without departing from the technical spirit or essential characteristics of the present disclosure. Accordingly, the aforementioned various embodiments should be constructed as being only illustrative not as being restrictive from all aspects. 
     While the present disclosure has been shown and described with reference to various embodiments thereof, it will be understood by those skilled in the art that various changes in form and details may be made therein without departing from spirit and scope of the present disclosure as defined by the appended claims and their equivalents.

Technology Classification (CPC): 6