摘要:
A decryption device includes: an internal-key storage section for storing an internal-key; a content-key storage section for storing a content-key; a determination section for determining whether or not a value of the content-key storage section in its initial state and a current value of the content-key storage section are different; and an operation section, the operation section including a first decrypting section which, when an encrypted content-key is input to the operation section, decrypts the encrypted content-key using the internal-key so as to obtain a content-key and stores the content-key in the content-key storage section, and a second decrypting section which, when an encrypted content is input to the operation section and the determination section determines that the value of the content-key storage section in its initial state and the current value of the content-key storage section are different, decrypts the encrypted content using the current value of the content-key storage section as a content-key so as to obtain a first output data and outputs the first output data to outside of the decryption device.
摘要:
The remote control signal reception controller receives control data transmitted from a remote control signal sender. The remote control signal reception controller informs a CPU that controls a device of the information on the received control data by interrupting the CPU. When doing so, the remote control signal reception controller judges whether a piece of control data that has just been received and a preceding piece of control data were consecutively transmitted, and whether these two pieces of control data are the same control data. The remote control signal reception controller interrupts the CPU only once when finding that the same control data is continuously transmitted as the result of this judgement.
摘要:
An apparatus and method for controlling data read access to memory, in response to an access request sent through a system bus. The apparatus includes an data storage device for preserving data corresponding to a predetermined address; a judging device for judging whether an access address indicated by the access request matches the predetermined address; and a control device for making the data storage device output data preserved therein to the system bus when the access address has been judged to match the predetermined address, and for making the data storage device hold data corresponding to a next address subsequent to the access address when the access address has been judged not to match the predetermined address.
摘要:
A host device and a slave device are set to a full-duplex mode by temporarily switching the communication direction of a first transmission channel or a second transmission channel after completing transmission and reception of a predetermined number of data packets in the half-duplex mode. The host device or the slave device can thus transmit an interrupt request, such as a request associated with a wait status or a busy status, to its communication target using the temporary full-duplex mode. This enables the host device or the slave device to process such an interrupt request during high-speed data transfer performed in the half-duplex mode.
摘要:
A data store system and a data restoration system that can decrease power consumed in data store-processing or data restoration are provided.A data transfer system includes a function block having store data; a storage section for storing the store data transferred from the function block; a bus having a bit width of a predetermined number of bits where the function block and the storage section are connected; and a controller for sending a store period clock to the function block and the storage section at the data store-processing and sending a restoration period clock to the function block and the storage section at the data restoration. In synchronization with the store period clock, the function block sends store data a predetermined number of bits at a time within the bit width of the bus to the bus and the storage section stores the store data sent in sequence from the function block through the bus. In synchronization with the restoration period clock, and the storage section sends the stored store data as many bits as the bit width of the bus at a time to the bus, and the function block reads the store data a predetermined number of bits at a time from the bus.
摘要:
A processor (10) manages, in an instruction management unit (103) and a data attribute management unit (105), secure attributes indicating whether instruction code and data stored in an instruction cache (102) and a data cache (104) of the processor (10) are confidential information. When the instruction code and the data are confidential information, the processor (10) also manages secure processing identification information for indicating in which secure process the confidential information is to be used. When the operating mode is switched from the secure mode to the normal mode, only the confidential information is disabled by a memory disabling unit (108). This prevents confidential information from being analyzed by the processor in the normal mode.
摘要:
A file management method, whereby inconsistencies can be prevented between a file recorded in a memory card and the file management information that a terminal apparatus manages, without leaking the information of a file made and stored in an in-card processing system. According to this method, a flash memory accessible from two processing systems 100 and 300 is provided. First processing system 100 requests a reservation of an use area of flash memory 200a to second processing system 300, which, upon receiving the request, implements a reservation processing for an area of the memory section and reflects the information of the reserve area upon file management section 230. First processing system 100 performs the processing of writing data into the area reserved by second processing system 300. Inconsistencies between the file management information that a terminal manages and a file actually recorded into the memory section of a secure card can be prevented. Furthermore, exclusive control can be implemented, whereby there will be no direct access from a terminal to the area used for a card-dedicated file recorded therein by means of processing that takes place inside the card.
摘要:
A memory device with a nonvolatile memory and RAM for accessing the nonvolatile memory is generally provided with a table to convert a logical address to a physical address, however, in the invention, the table is divided to a first table on RAM and a second table on the nonvolatile memory. The first table converts specific bits of the logical address to a first physical address indicating a location of the second table. The second table converts the other bits of the logical address to a physical address of a representative page of pages contained in a storage area corresponding to the logical address. A unit operable to access data (a writing unit operable to, a reading unit operable to, and an erasing unit operable to) reaches a target physical address based on the logical address. Such configuration can reduce the capacity of each conversion table.
摘要:
A memory device that is free from problems resulted from the characteristics of nonvolatile memory chips. The problems are specifically those occurring at the time of data transfer between nonvolatile memory chips, e.g., data error or program error occurring after data transfer. In the memory device, an error correction code process unit applies error detection to data read from a nonvolatile memory chip to a data line for data transfer. For such detection, an error correction code for the data is referred to. At the time of data transfer between the nonvolatile memory chips, if the data is detected as containing a correctable error, a writing unit writes the corrected data to a nonvolatile memory, which is the transfer destination. In this manner, at the time of data transfer between the nonvolatile memory chips, the error never fails to be detected before data writing.
摘要:
A request change unit outputs a command as a request under control of a judgment control unit. A response condition determination unit determines a condition that is to be matched by a correct response which is to be returned from the other device-in-communication in reply to the command if the other device-in-communication operates in conformity with a protocol. A check unit checks a response received from the other device-in-communication in reply to the command, against the condition. If the received response does not match the condition but is correctable to match the condition as a result of the check, a response correction unit corrects the received response to match the condition under control of the judgment control unit.