摘要:
A continuous data server apparatus incorporating a plurality of buffer memory units for storing the continuous data read out by the data memory control units and to be given to the communication control unit, at least one buffer memory unit being provided dedicatedly for each combination of one data memory control unit group formed by at least one data memory control unit and one communication control unit group formed by at least one communication control unit. The apparatus may further incorporate a plurality of calculation units connected in series, where each calculation unit is connected between corresponding one data memory control unit group and at least one buffer memory unit, and carrying out a prescribed calculation processing. The continuous data can be arranged over a plurality of data memory control units in word units, such that the data memory control units read out the continuous data in block units, the buffer memory units store the continuous data in block units, and the communication control unit transfers the continuous data obtained by reading out data the buffer memory units sequentially in word units.
摘要:
According to an embodiment, a control device includes a calculator and a setting unit. The calculator is configured to calculate a system processing time indicating a time required for processing executed after a system, the system including a plurality of elements, power to each element being individually controlled, resumes from a sleep state in which the number of elements supplied with power is limited to a predetermined number and an operation of the system is stopped. The setting unit is configured to set a mode indicating an operation state of the system according to the system processing time calculated by the calculator when a resume factor indicating a factor for resuming the system from the sleep state occurs.
摘要:
In one embodiment, a memory system for writing redundant data output by an encoding processing circuit, comprises a memory, a encoding processing circuit, and a decoding circuit. The memory is electrically rewritable by using memory cells. The memory cells are capable of having two different resistance values corresponding to logical values of 1 or 0 respectively. The redundant data is read from and a predetermined logical value is written to the memory by flowing current in a same direction. The encoding processing circuit performs redundant encoding processing on target data and outputs redundant data. A number of bits having the predetermined logical value exceeds a number of bits having the logical value other than the predetermined logical value, for writing the redundant data to the memory. A decoding circuit reads data from the memory, and performs a decoding process on the data.
摘要:
According to one embodiment, a memory device comprises a writing device that writes data bits, check bits for error corrections, and overhead bit(s) into a memory, each bit of the overhead bit(s) corresponding to each group of bit group(s) including at least one bit of the data bits and/or the check bits, each bit of the overhead bit(s) indicating whether the corresponding bit group has been inverted, a reading unit that reads the data bits, the check bits, and the overhead bit(s) from the memory, a correcting unit that corrects an error in the data bits and overhead bit(s) read from the memory, based on the check bits, and an inverting unit that inverts the data bits contained in the bit group corresponding to the overhead bit and outputs the inverted data bits as data read from the memory when the error-corrected overhead bit indicates that inversion has been performed.
摘要:
According to one embodiment, a semiconductor device includes a processor, and a memory device. The memory device has a nonvolatile semiconductor storage device and is configured to serve as a main memory for the processor. When the processor executes a plurality of programs, the processor manages pieces of information required to execute the programs as worksets for the respective programs, and creates tables, which hold relationships between pieces of information required for the respective worksets and addresses of the pieces of information in the memory device, for the respective worksets. The processor accesses to the memory device with reference to the corresponding tables for the respective worksets.
摘要:
According to one embodiment, a controller includes a state detecting unit, a calculating unit, and a determining unit. The state detecting unit detects an idle state in which indicates there are no process that can execute on a processing device capable of performing one or more processes. The calculating unit calculates a resuming time, which indicates a time length until the next process starts, when the state detecting unit detects the idle state. The determining unit determines an operation mode of the processing device on the basis of the resuming time calculated by the calculating unit.
摘要:
According to an embodiment, a control device includes a calculator and a setting unit. The calculator is configured to calculate a system processing time indicating a time required for processing executed after a system, the system including a plurality of elements, power to each element being individually controlled, resumes from a sleep state in which the number of elements supplied with power is limited to a predetermined number and an operation of the system is stopped. The setting unit is configured to set a mode indicating an operation state of the system according to the system processing time calculated by the calculator when a resume factor indicating a factor for resuming the system from the sleep state occurs.
摘要:
According to an embodiment, a control system includes a detector, an estimating unit, a determining unit, and a controller. The detector detects an idle state. The estimating unit estimates an idle period. When the idle state is detected, the determining unit determines whether a first power consumption when writeback of data which needs to be written back to a main storage device is performed and supply of power to a cache memory is stopped, is larger than a second power consumption when writeback of the data is not performed and supply of power is continued for the idle period. The controller stops the supply of power to the cache memory when the first power consumption is determined to be smaller than the second power consumption and continues the supply of power when the first power consumption is determined to be larger than the second power consumption.
摘要:
A cache memory has a data holding unit having multiple cache lines each of which includes an address area, a data area and a dirty bit, and a controller which is given read data and a correction execution signal indicating whether or not error correction has been performed for the read data, the read data has been read from a memory storing error-correction-coded data, which also stores address information corresponding to the read data into the address area of any one of the multiple cache lines, stores the read data into the data area, and sets a predetermine value as the dirty bit on the basis of the correction execution signal.
摘要:
According to one embodiment, a storage device management device is connected to a random access memory and a first storage device. When the random access memory includes a free region sufficient to store write data, the write data is stored onto the random access memory. Data on the random access memory selected in the descending order of elapsed time from the last access is sequentially copied onto the first storage device, and a region in the random access memory which has stored the copied data is released. When stored on the random access memory, the read data is read from the random access memory to the processor. When stored on the first storage device, the read data is copied onto the random access memory and read from the random access memory to the processor.