JP2002229744A - Data writing device and data writing method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To solve the problem of a possibility that data different from primary data are written and abnormal data are left in an IC card when a data writing action is resumed after recovery from a reset. SOLUTION: When a data writing action sequence to a storage medium is interrupted, a writing state identification flag setting a value corresponding to the data writing state to the storage medium is referred to. When the interrupt time is judged as a data writing period, data stored in a backup memory means are read and written on the storage medium.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a data writing device for writing desired data to a recording medium, and more particularly, to writing new data contents to a recording medium, even if the operation sequence related to the writing is interrupted. The present invention relates to a data writing device and a data writing method capable of writing data having desired contents to a recording medium.

[0002]

2. Description of the Related Art In recent years, digital broadcast receiving apparatuses have received an IC card for storing information relating to a digital broadcast signal for which the contracted viewing has been permitted, so that only the digital broadcasting signal for which the contract has been received can be viewed. A system to be referred to at the time is constructed. The interface of this IC card is ISO (Internationa
l Organization for Standa
rdization: International Organization for Standardization), and a dedicated interface IC is used. By using such an IC card interface, the digital broadcast receiving apparatus as described above can be realized.

[0003] Further, the IC card system used for the control of digital broadcast reception as described above is a data writer capable of appropriately rewriting data stored in the IC card due to a change in a contract of a user or the like. Has a function. As a result, a digital broadcast receiving service suitable for the user can be provided.

FIG. 3 shows, for example, Japanese Unexamined Patent Application Publication No. 11-353063.
Having a function as a conventional data writer applied to a digital broadcast receiver disclosed in Japanese Patent Application Publication
FIG. 2 is a block diagram illustrating a configuration of a card system. In the figure, 101 is an antenna for receiving a digital broadcast signal, and 102 is a controller for controlling the operation of the broadcast receiving / decoding unit 115, which has a microcomputer. 103 is an operation key used by the user to select a channel, 104 is a tuner, and selects a broadcast signal of a predetermined RF channel from digital broadcast signals of a plurality of RF channels received via the antenna 101. And outputs digital modulation data corresponding to the digital broadcast signal of the predetermined RF channel. 105 is a tuner 104
Demodulator 106 for demodulating digitally modulated data from
Performs error correction of output data from the demodulator 105 and outputs an MPEG2 signal corresponding to the broadcast signal of the predetermined RF channel.
(Moving Picture Experts G
loop 2) An error correction unit 107 for generating the transport stream TS. A descrambler 107 performs descrambling processing on video data and audio data packets scrambled in the transport stream TS.

[0005] 108 separates the above-mentioned transport stream packets TS, and comprises a video data stream VDS and an audio data stream A composed of those packets.
DS: a packet separation unit that outputs a video signal SV by performing data decompression processing or the like on a video data stream VDS, 110: a video output connector that outputs a video signal SV, 111: audio data An audio decoding unit that generates an audio signal SA by performing data expansion processing or the like on the stream ADS;
Reference numeral 2 denotes an audio output connector for outputting an audio signal SA. Reference numeral 113 denotes an IC card for storing information related to a digital broadcast permitted to be viewed in a contracted manner, which is used in descrambling by the descrambler 107 as information related to a digital broadcast permitted to be viewed in a contracted manner. It has a microcomputer that stores scramble key information and the like, and that determines whether viewing is possible or not based on limited reception information sent from the controller 102 via the IC card interface 114. 114 is a controller 102 and an IC card 113
And relays data transmitted and received between the controller 102 and the IC card 113. 115 is a tuner 104, a demodulator 105,
Error correction unit 106, descrambler 107, packet separation unit 108, video demodulation unit 109, and audio decoding unit 11
1 is a broadcast receiving / decoding unit.

Next, the operation will be described. First, the user selects a channel using the operation keys 103. This tuning information is output to the controller 102, and the tuner 104 is controlled by the station selected by the user. As a result, the tuner 104 selects a broadcast signal of a predetermined RF channel corresponding to a station selected by the user from among a plurality of broadcast signals received by the antenna 101, and selects a digital broadcast signal of the predetermined RF channel. And outputs digital modulation data corresponding to.

[0007] The digitally modulated data from the tuner 104 is demodulated by a demodulator 105 to be processed by an error correction unit 10.
6 is output. The error correction unit 106 performs an error correction process on the output data to generate an MPEG2 transport stream TS,
7 is output. The descrambler 107 performs descrambling processing on video data and audio data packets scrambled by the input transport stream TS.

At this time, the IC card 113 provides the scramble key information necessary for the descrambling process to the controller 102 via the IC card interface 114. The controller 102 outputs the scramble key information from the IC card 113 to the descrambler 107,
Causes descrambling to be performed. Further, the IC card 113 stores the scramble key information and also receives the limited reception information (for example, limited reception information transmitted from the controller 102 via the IC card interface 114).
It is determined whether the received broadcast can be viewed or not based on the broadcast permitted to be viewed during the limited period, and if so, the scramble key information is transmitted to the IC card interface 1.
14 to the controller 102.

[0009] Next, the packet demultiplexer 108 de-scrambles the transport / de-scrambled data by the descrambler 107.
Video data and audio data packets are separated from the stream TS. These packets are transmitted in the video data stream VDS or audio data stream A.
A DS is formed and output from the packet separation unit 108.
The video data stream VDS and the audio data stream ADS from the packet separation unit 108 are input to the video decoding unit 109 and the audio decoding unit 111, respectively, and are subjected to data expansion processing. As a result, a video signal SV and an audio signal SA are obtained and output from the video output connector 110 and the audio output connector 112, respectively.

Here, an operation of writing data to the IC card 113 in the digital broadcast receiving apparatus disclosed in Japanese Patent Application Laid-Open No. 11-353063 will be described. In this digital broadcast receiving apparatus, a backup capacitor is provided in the middle of a power supply line for supplying power from a main power supply to the IC card interface 114. This capacitor is the IC card interface 11
4 is configured to be charged while a DC voltage is supplied from the main power supply. The data writing operation to the IC card 113 includes the IC card interface 11
Desired data from the controller 102 through the IC 4
The data is output to the card 113 and written. At this time, even if the power supply from the main power supply is cut off and the IC card interface 114 is turned off, the voltage charged by the capacitor is supplied. As a result, the power supply is backed up for a predetermined time corresponding to the amount of charge charged by the capacitor, and data can be written to the IC card 113.

[0011]

Since the conventional data writing apparatus is configured as described above, a large-capacity, large-capacity capacitor is required to back up the power supply without interrupting the operation sequence related to the data writing. However, there is a problem that the miniaturization of the controller 102 is limited. For this reason, a personal computer with a smaller size as the controller 102 is not suitable.

When the digital broadcast receiving apparatus is realized by a board that can be built in a personal computer, when the personal computer as a controller is reset during data writing to an IC card due to a user's intention or a hang-up of the OS. There is. As described above, when the operation sequence related to the data writing is interrupted by the reset, in the conventional data writing device, the data at the time of the interruption (for example, the data to be written at the time of interruption and the address of the storage device that stores the data). Is not stored, and the data write operation is not automatically restarted after the reset, so that the data in the IC card remains destroyed and abnormal data may remain. In such a case, normal received information is not transmitted to the digital broadcast receiving device.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-described problem. Even if an operation sequence related to data writing to a recording medium is interrupted, the state at the time of interruption when data writing is resumed is changed. It is an object of the present invention to provide a data writing device and a data writing method thereof that can prevent erroneous data from being written by determining, and can further reduce the size of the device.

[0014]

According to the present invention, there is provided a data writing apparatus comprising: a write state identification flag for setting a value according to a data write state on a recording medium; and data to be written on the recording medium and a write state identification flag. When an operation sequence related to data writing to the backup storage means and the recording medium for which the value is stored is interrupted, the data writing at the time of the interruption is performed by referring to the value of the write state identification flag stored in the backup storage means. Writing state determining means for determining a state;
When it is determined by the write state determining means that the time point at which the writing was interrupted is data writing, data writing means for reading data to be written to the recording medium stored in the backup storage means and writing data to the recording medium is provided. It is provided.

[0015] The data writing method of the data writing apparatus according to the present invention includes: a writing state identification flag for setting a value according to a data writing state on a recording medium;
In a data writing method of a data writing device, comprising a backup storage unit in which data to be written to a recording medium and a value of a write state identification flag are stored.
When writing data to the recording medium, the data to be written to the recording medium and the value indicating the writing status of the write state identification flag are recorded in the backup storage means in advance, and a data writing process is performed on the recording medium. When the data writing is completed, the writing step of rewriting the write state identification flag stored in the backup storage means to a value indicating the completion of writing, and when the operation sequence related to data writing to the recording medium in the writing step is interrupted, A write state determining step of determining whether data is being written to the recording medium at the point of interruption with reference to the value of the write state identification flag previously stored in the backup storage means, and interrupting at the write state determining step Is the date If it is determined that a during writing, reading data stored in advance in the backup storage means, in which and a write restart step of restarting the data write operation to the recording medium at writing step.

[0016]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below. Embodiment 1 FIG. FIG. 1 is a block diagram showing a configuration of a digital broadcast receiving apparatus using a data writing device according to Embodiment 1 of the present invention. In the figure, reference numeral 1 denotes a digital broadcast receiving board which is built in the personal computer 9 and realizes a digital broadcast receiving function.
It comprises a C card interface 2 and a broadcast receiving / decoding unit 5, and is connected to an antenna (not shown) via an antenna input connector 8 and to a personal computer 9 via a local bus 13. Reference numeral 2 denotes an IC card interface (data writing means) for connecting the IC card 4 to the personal computer 9 and the broadcast receiving / decoding unit 5 so that data can be transmitted and received, and is provided on the digital broadcast receiving board 1. Reference numeral 3 denotes an IC card socket for connecting the IC card interface 2 and the IC card 4, and reference numeral 4 denotes an IC card (recording medium). /
In addition to storing the scramble key information and the like used in the descrambling process in the decryption unit 5, the permission / inhibition of viewing is determined based on the limited reception information sent from the controller of the personal computer 9 via the IC card interface 2. It has a microcomputer to determine.

A broadcast receiving / decoding unit 5 receives and decodes the digital broadcast and outputs a video signal and an audio signal. The broadcast receiving / decoding unit 115 shown in FIG.
The same operation is performed with the same configuration. Reference numeral 6 denotes a video output connector for outputting a video signal decoded by the broadcast receiving / decoding unit 5, and reference numeral 7 denotes an audio output connector for outputting an audio signal decoded by the broadcast receiving / decoding unit 5. Reference numeral 8 denotes an antenna input connector used to input a signal from an antenna device (not shown) for receiving a digital broadcast signal to the broadcast receiving / decoding unit 5.
It is interposed between the decoding unit 5. 9 is a personal computer (data writing means, data writing means) functioning as a controller for controlling the operation of the digital broadcast receiving board 1, and 10 is a CP of the personal computer 9.
U and 11 are hard disks (backup storage means) of the personal computer 9 and store data obtained as a result of execution of various programs by the CPU 10 and programs such as an operation system OS and application software. In addition, the hard disk 11 has a storage area for storing data to be written in advance at the time of data writing operation on the IC card 4. Reference numeral 12 denotes a RAM of the personal computer 9;
A RAM or the like is conceivable. Reference numeral 13 denotes a local bus connected to the digital broadcast receiving board 1 so that data can be transmitted and received.

Next, the operation will be described. First, the user selects a channel using input means such as a keyboard (not shown) of the personal computer 9. The CPU 10 in the personal computer 9 according to the input information of the user,
The broadcast receiving / decoding unit 5 is controlled so as to receive a digital broadcast signal corresponding to a channel of a selected station from digital broadcast signals of a plurality of channels received via an antenna device (not shown). The received digital broadcast signal is converted into digital modulation data by the broadcast receiving / decoding unit 5 and then demodulated, error-corrected, and becomes an MPEG2 transport stream TS. Further, the broadcast receiving / decoding unit 5 performs descrambling processing on the video data and audio data packets scrambled in the transport stream TS.

At this time, the IC card 4 connects the scramble key information required for the descrambling process to the IC card interface 2 through the IC card socket 3.
And to the CPU 10 in the personal computer 9 via the local bus 13. The CPU 10 receives broadcast /
It controls the decryption unit 5 to perform descrambling processing of the received digital broadcast signal using the scramble key information from the IC card 4. The IC card 4 stores the above-mentioned scramble key information, and also receives limited reception information (for example, watching during a limited period) transmitted from the personal computer 9 via the local bus 13 and the IC card interface 2. Based on the permitted broadcast, etc.), and judges whether the received broadcast can be viewed or not.
3 and outputs the scramble key information to the CPU 10. At this time, similarly to the above operation, the CPU 10 controls the broadcast receiving / decoding unit 5 to perform descrambling processing of the corresponding digital broadcast signal using the scramble key information.

Next, the broadcast receiving / decoding unit 5 separates video data and audio data packets from the descrambled transport stream TS. These packets constitute a video data stream VDS and an audio data stream ADS. These video data stream VDS and audio data
The stream ADS is subjected to data decompression processing by the broadcast receiving / decoding unit 5, and is output as a video signal SV and an audio signal SA from the video output connector 6 and the audio output connector 7, respectively.

FIG. 2 is a diagram showing a specific configuration example of the data writing device according to the first embodiment. In the figure, 1
Reference numeral 1a denotes a backup storage area (backup storage means) provided in the hard disk 11, which stores data to be written when data is written to the IC card 4. Hereinafter, the backup storage area 11a is abbreviated as the HDD 11a. Reference numeral 14 denotes a controller (data writing means) for controlling the digital broadcast receiving board 1 by the CPU 10 in the personal computer 9. The controller 14 controls the digital broadcast receiving board 1 and executes the control program for the digital broadcast receiving board 1. Become. Reference numeral 15 denotes an R used as a main memory or a cache memory in the CPU 10.
The write flag (write state identification flag) stored in the AM 12 is set to a value according to the state of data writing to the IC card 4. Here, a logical value 1 is set as a value indicating that data writing is being performed, and a logical value 0 is set as a value indicating completion of data writing.

Reference numeral 16 denotes an IC card interface 2 to I
A clock signal supplied to the C card 4 and synchronized with the clock signal 16;
A data signal 17 is transmitted and received between and the IC card 4. 17 is an IC card interface 2 and an IC card 4
A data signal transmitted on a data bus provided between
Reference numeral 18 denotes a power supply, which is supplied from the controller 14 to the IC card 4 via the IC card interface 2.
Reference numeral 19 denotes a reset signal, which is determined to be valid / invalid by setting logical values 0 and 1, and when valid, data access between the IC card interface 2 and the IC card 4 is not performed. A card detection signal 20 is generated by opening a switch (not shown) in the IC card socket 3 when the IC card 4 is inserted, and is output to the controller 14 via the IC card interface 2. Reference numeral 21 denotes a read / write setting signal, which is a signal for setting read / write when viewed from the IC card interface 2 when data is accessed between the IC card interface 2 and the IC card 4. In other words, the lead
When the write setting signal 21 is set to read, data is transferred from the IC card 4 to the IC card interface 2, and when set to write, data is transferred from the IC card interface 2 to the IC card 4. The above signals are exchanged between the IC card interface 2 and the IC card 4.

The following signals are exchanged between the IC card interface 2 and the CPU 10. First, 2
Reference numeral 2 denotes a clock signal supplied from the CPU 10 to the IC card interface 2. In synchronization with the clock signal 22, the CPU 10 and the IC card interface 2 transmit a data signal 23 via a data bus and an address bus connecting them. And the transmission and reception of the address signal 24. 23 is a data signal exchanged between the IC card interface 2 and the CPU 10, 24 is an address signal exchanged between the IC card interface 2 and the CPU 10, and 25 is a reset signal having a logical value of 0,
The validity / invalidity is determined by setting “1”, and when valid, the operation of the IC card interface 2 is stopped. 2
Reference numeral 6 denotes an access request signal which requests the CPU 10 to access a data bus and an address bus between the IC card interface 2 and the CPU 10 when the IC card interface 2 reads data from the IC card 4. . 27 is a chip select signal, CP
When U10 permits access, it becomes valid and enables data access between the IC card interface 2 and the CPU 10. A read / write setting signal 28 is a signal for setting read / write when viewed from the CPU 10 when data is accessed between the IC card interface 2 and the CPU 10. That is, data is transferred from the IC card interface 2 to the CPU 10 when the read / write setting signal 28 is set to read, and data is transferred from the CPU 10 to the IC card interface 2 when the read / write setting signal 28 is set to write.

Next, the operation will be described. Since the present invention relates to data writing, the data writing operation to the IC card 4 will be described here, and the description of other operations will be omitted. C constituting the controller 14
By executing a data rewriting instruction for the IC card 4 in the application software executed by the PU 10, the data writing operation starts. First, before actually writing data to the IC card 4, the controller 14 records data to be written to the IC card 4 in the HDD 11 a mounted on the personal computer 9. At this time, the CPU 10 sets the write flag 15 to a logical value 1 indicating that writing is in progress, and this value is also recorded in the HDD 11a by the controller 14. The steps up to here correspond to the backup step.

When the processing before writing data to the IC card 4 is completed, the CPU 1 in the controller 14
0 releases the reset signal 25 for the IC card interface 2 and makes the chip select signal 27 valid. Thereby, the IC card interface 2 and the CPU 10
And data access is possible. Following this,
The CPU 10 in the controller 14 sets the read / write setting signal 28 to write, accesses the IC card interface 2 through the data bus and the address bus, and writes data including the data signal 23 and the address signal 24.

Next, the IC card interface 2 releases the reset signal 19 to the IC card 4 and sets the read / write setting signal 21 to write setting. This allows I
The C card interface 2 writes data to the IC card 4 via the data bus in synchronization with the clock signal 16. When this write operation is completed, the controller 1
The CPU 10 in 4 changes the write flag 15 previously set to a logical value 0 indicating completion of writing and records the logical value on the HDD 11a. These steps correspond to the writing step.

In the writing step, the CPU 10
Is reset (when the operation sequence related to writing data to the IC card 4 is interrupted),
U10 sends the write flag 1 from HDD 11a after reboot.
Read the value of 5. Referring to the value of the write flag 15, the CPU 10 determines whether the reset has been performed while data is being written to the IC card 4 or reset after the write is completed (write state determining step).

If it is determined that the CPU 10 has been reset during data writing to the IC card 4, the CPU 1
0 reads the data backed up in the HDD 11a and restarts the write operation to the IC card 4 by the above method (write restart step).

In the above-described embodiment, an example has been described in which data to be written to the IC card 4 is backed up to the HDD 11 or the HDD 11a. However, the present invention is not limited to this. A recording medium such as a flash memory, an MO, and a floppy (registered trademark) disk may be used.

In the above embodiment, the connection of the components of the IC card system such as the CPU 10, the IC card interface 2, and the IC card 4 has been described with reference to FIG. 2, but the present invention is not limited to this. Instead, the present invention can be applied to any configuration having a backup storage unit and a write flag 15 for identifying a write state and capable of writing data to the IC card 4. Furthermore, although the IC card 4 has been described as an example in which data is written, the present invention is not limited to this, and can be applied to various recording media.

As described above, according to the first embodiment, the value corresponding to the data write state to the IC card 4 is set in the write flag 15 and the IC 11 is stored in the HDD 11a.
Data to be written to card 4 and write flag 15
Is stored, and when the operation sequence related to writing data to the IC card 4 is reset, the HDD
The data write state at the time of reset is determined with reference to the value of the write flag stored in the HDD 11a. If it is determined that the data is being written at the reset time, the data stored in the HDD 11a is deleted. Since reading and writing of data to the IC card 4 are performed,
Even if the CPU 10 is reset while data is being written to the C card 4, the data contents to be written to the IC card 4 can be written again from the HDD 11a, so that abnormal data can be prevented from being written to the IC card 4.

[0032]

As described above, according to the present invention, the value corresponding to the data write state on the recording medium is set in the write state identification flag, and the data to be written to the recording medium and the write state identification in the backup storage means are set. The value of the flag is stored, and when the operation sequence related to writing data to the recording medium is interrupted, the data at the time when the operation is interrupted with reference to the value of the write state identification flag stored in the backup storage means. The write state is determined, and if it is determined that the data is being written at the point of interruption, the data stored in the backup storage unit is read and the data is written to the recording medium. Even if the operation sequence related to data writing is interrupted during Since it is possible to write the data content to be written into the recording medium again from the step, there is an effect that it is possible to prevent the abnormal data is written to the recording medium. Further, since a capacitor or the like is not used unlike the related art, there is an effect that the device can be downsized.

[Brief description of the drawings]

FIG. 1 is a block diagram showing a configuration of a digital broadcast receiving device using a data writing device according to a first embodiment of the present invention.

FIG. 2 is a diagram showing a specific configuration example of a data writing device according to the first embodiment.

FIG. 3 is a block diagram showing a configuration of an IC card system having a function as a conventional data writing device.

[Explanation of symbols]

REFERENCE SIGNS LIST 1 digital broadcast receiving board, 2 IC card interface (data writing means), 3 IC card socket, 4 IC card (recording medium), 5 broadcast receiving / decoding section, 6 video output connector, 7 audio output connector,
8 antenna input connector, 9 personal computer (data writing means, data writing device), 10
CPU, 11 hard disk (backup storage means), 11a backup storage area (backup storage means), 12 RAM, 13 local bus, 14 controller (data writing means), 15
Write flag (write state identification flag), 16
Clock signal, 17 data signal, 18 power supply, 19
Reset signal, 20 card detection signal, 21 read
Write setting signal, 22 clock signal, 23 data signal, 24 address signal, 25 reset signal, 26
Access request signal, 27 chip select signal, 28
Read / write setting signal.

 ──────────────────────────────────────────────────続 き Continuing from the front page (72) Inventor Atsushi Haratani 810 Shimo-Imaizumi, Ebina-shi, Kanagawa Prefecture Inside the Digital Media System Business Division, Hitachi, Ltd. (72) Inventor Yoshihiro Machida 810 Shimo-Imaizumi, Ebina-shi, Kanagawa Prefecture (72) Inventor Yutaka Okayama 1099 Ozenji Temple, Aso-ku, Kawasaki City, Kanagawa Prefecture Inside Hitachi Systems Development Laboratory (72) Inventor 1099 Ozenji, Aso-ku, Kawasaki City, Kanagawa Prefecture, Japan Address F-term in Hitachi, Ltd. Systems Development Laboratory (Reference) 5B058 CA26 KA04 KA08 YA20 5B065 BA09 CE12 EA18 EA24 5C064 CB08 CC01 CC04

Claims (2)

[Claims] 1. A write state identification flag for setting a value according to a data write state on a recording medium; backup storage means for storing data to be written on the recording medium and a value of the write state identification flag; When an operation sequence related to writing data to the recording medium is interrupted, a write state determining unit that determines a data write state at the time of interruption by referring to a value of the write state identification flag stored in the backup storage unit When it is determined by the write state determining means that the data is being written at the time of the interruption, data to be written to the recording medium stored in the backup storage means is read, and data writing to the recording medium is performed. Data writing with data writing means to perform Burn-in device. 2. A write state identification flag in which a value according to a data write state on a recording medium is set, and backup storage means in which data to be written on the recording medium and a value of the write state identification flag are stored. In the data writing method of the data writing device, when writing data to the recording medium, data to be written to the recording medium and a value indicating that the writing state identification flag is being written are previously recorded in the backup storage means. A write step of performing a data write process on the recording medium, and rewriting the write state identification flag stored in the backup storage means to a value indicating the write completion when the data write is completed; The above record in the writing step When the operation sequence related to writing data to the medium is interrupted, referring to the value of the write state identification flag previously stored in the backup storage means, the time at which the operation was interrupted is to determine whether the data was being written to the recording medium. When it is determined in the write state determination step that the time of the interruption is data writing, the data stored in advance in the backup storage unit is read out. A data rewriting step for resuming a data writing operation on the recording medium in the writing step.