摘要:
A semiconductor disk wherein a flash memory into which data is rewritten in block unit is employed as a storage medium, the semiconductor disk including a data memory in which file data are stored, a substitutive memory which substitutes for blocks of errors in the data memory, an error memory in which error information of the data memory are stored, and a memory controller which reads data out of, writes data into and erases data from the data memory, the substitutive memory and the error memory. Since the write errors of the flash memory can be remedied, the service life of the semiconductor disk can be increased.
摘要:
A control method and system when a flash memory is used. as a semiconductor disk or a main memory in an information processing system. A semiconductor file system comprises a first nonvolatile memory electrically erasable, a second nonvolatile memory not electrically erasable, a volatile memory, a controller which controls the memories, and a control section which controls the controller wherein a physical address corresponding to a logical address specified from an external system is accessed. The first nonvolatile memory stores data for the external system to perform operations, first management information indicating the correspondence between physical addresses at which the data is stored and logical addresses, and second management information indicating a state of the first nonvolatile memory. The second nonvolatile memory previously stores interface information required for inputting and outputting the data from and to the external system and read-only data of the data. The controller comprises control means for determining a physical sector address forming predetermined high-order bits of the physical address when data is output from the first nonvolatile memory or when data is input to the volatile memory, means for storing the determined physical sector address, and means for consecutively generating addresses in a sector determined by the physical sector address. The control section is responsive to the interface information, the first management information, and the second management information for controlling input/output of data from/to the external system and for temporarily storing write data into the first nonvolatile memory from the external system in the volatile memory and then transferring the write data from the volatile memory to the first nonvolatile memory. The consecutive address generation means and the sector address storage means output the physical sector address and the consecutively generated addresses to the first nonvolatile memory and the volatile memory when data at the physical sector address is output from the first nonvolatile memory or when data at the physical sector address is input to the volatile memory.
摘要:
A semiconductor file system features a first nonvolatile memory electrically erasable, a second nonvolatile memory not electrically erasable, a volatile memory, a controller, and a control section which controls the controller wherein a physical address corresponding to a logical address specified from an external system is accessed. The first nonvolatile memory stores data for the external system to perform operations, first management information indicating correspondence between physical and logical addresses, and second management information indicating a state of the first nonvolatile memory. The second nonvolatile memory previously stores interface information. The controller determines a physical sector address. The control section is for controlling input/output of data from/to the external system and for temporarily storing write data into the first nonvolatile memory from the external system in the volatile memory and then transferring the write data from the volatile memory to the first nonvolatile memory.
摘要:
A control method and system when a flash memory is used as a semiconductor disk or a main memory in an information processing system. A semiconductor file system comprises a first nonvolatile memory electrically erasable, a second nonvolatile memory not electrically erasable, a volatile memory, a controller which controls the memories, and a control section which controls the controller wherein a physical address corresponding to a logical address specified from an external system is accessed. The first nonvolatile memory stores data for the external system to perform operations, first management information indicating the correspondence between physical addresses at which the data is stored and logical addresses, and second management information indicating a state of the first nonvolatile memory. The second nonvolatile memory previously stores interface information required for inputting and outputting the data from and to the external system and read-only data of the data. The controller has a control means for determining a physical sector address forming predetermined high-order bits of the physical address when data is output from the first nonvolatile memory or when data is input to the volatile memory, means for storing the determined physical sector address, and means for consecutively generating addresses in a sector determined by the physical sector address.
摘要:
A control method and system when a flash memory is used as a semiconductor disk or a main memory in an information processing system. A semiconductor file system comprises a first nonvolatile memory electrically erasable, a second nonvolatile memory not electrically erasable, a volatile memory, a controller which controls the memories, and a control section which controls the controller wherein a physical address corresponding to a logical address specified from an external system is accessed. The first nonvolatile memory stores data for the external system to perform operations, first management information indicating the correspondence between physical addresses at which the data is stored and logical addresses, and second management information indicating a state of the first nonvolatile memory. The second nonvolatile memory previously stores interface information required for inputting and outputting the data from and to the external system and read-only data of the data. The controller has a control means for determining a physical sector address forming predetermined high-order bits of the physical address when data is output from the first nonvolatile memory or when data is input to the volatile memory, means for storing the determined physical sector address, and means for consecutively generating addresses in a sector determined by the physical sector address.
摘要:
A control method and system when a flash memory is used as a semiconductor disk or a main memory in an information processing system. A semiconductor file system comprises a first nonvolatile memory electrically erasable, a second nonvolatile memory not electrically erasable, a volatile memory, a controller which controls the memories, and a control section which controls the controller wherein a physical address corresponding to a logical address specified from an external system is accessed. The first nonvolatile memory stores data for the external system to perform operations, first management information indicating the correspondence between physical addresses at which the data is stored and logical addresses, and second management information indicating a state of the first nonvolatile memory. The second nonvolatile memory previously stores interface information required for inputting and outputting the data from and to the external system and read-only data of the data. The controller comprises control means for determining a physical sector address forming predetermined high-order bits of the physical address when data is output from the first nonvolatile memory or when data is input to the volatile memory, means for storing the determined physical sector address, and means for consecutively generating addresses in a sector determined by the physical sector address.
摘要:
A control method and system when a flash memory is used as a semiconductor disk or a main memory in an information processing system. A semiconductor file system comprises a first nonvolatile memory electrically erasable, a second nonvolatile memory not electrically erasable, a volatile memory, a controller which controls the memories, and a control section which controls the controller wherein a physical address corresponding to a logical address specified from an external system is accessed. The first nonvolatile memory stores data for the external system to perform operations, first management information indicating the correspondence between physical addresses at which the data is stored and logical addresses, and second management information indicating a state of the first nonvolatile memory. The second nonvolatile memory previously stores interface information required for inputting and outputting the data from and to the external system and read-only data of the data. The controller comprises control means for determining a physical sector address forming predetermined high-order bits of the physical address when data is output from the first nonvolatile memory or when data is input to the volatile memory, means for storing the determined physical sector address, and means for consecutively generating addresses in a sector determined by the physical sector address.
摘要:
A battery power supply system for supplying DC electric power to a DC operated apparatus includes an AC/DC adapter for converting AC electric power into DC electric power, a plurality of batteries and a battery charger for charging the plurality of batteries. The battery power supply system includes a plurality of charge lines for connecting the battery charger to the plurality of batteries and a plurality of discharge lines connected to outputs of the plurality of batteries. Switches are provided in each of the plurality of charge lines and discharge lines.
摘要:
A semiconductor storage apparatus such as a disk pack in which a controller sends a second write command or instruction while a write operation for a first write command or instruction is being carried out. The storage apparatus includes a plurality of flash memories which operate slower in writing data thereinto than the reading data therefrom, a write buffer memory in which data are temporarily held, a processor which controls the data writing operation and which transfers and analyzes commands and statuses, an address controller which generates physical addresses, a circuit which generates a writing supply voltage Vpp for the flash memories, a memory address bus, and a data bus. The semiconductor disk pack is connected to a standard bus in a personal computer or the like. The processor writes the data of one word into a desired one of the flash memories, and it continuously writes the data of one word into an accessible one of the other flash memories during a latency which extends until the desired flash memory becomes capable of writing the next data of one word thereinto.
摘要:
A semiconductor storage device such as a disk pack includes a plurality of flash memories, a write buffer memory in which data are temporarily held, a processor which controls data writing and erasing operations and which transfers and analyzes commands and statuses to and from the flash memories, and a circuit which generates a writing supply voltage Vpp, different from a reading supply voltage, for the flash memories. The processor operates to send a first instruction for writing or erasing data of one word into a first one of the flash memories, and it continuously writes the data of one word into an accessible one of the other flash memories before the first one of the flash memories becomes capable of accepting the next write or erase instruction. The processor determines whether each nonvolatile memory has individually become ready to accept a new write or erase instruction. A plurality of instructions for writing or erasing data for consecutive addresses may thus be distributively, e.g., sequentially, fed to the plurality of nonvolatile memories to reduce a time period for writing or erasing data. The semiconductor storage device further includes a static random access memory for storing a conversion table for converting logical sector numbers into physical sector numbers for those areas of the flash memories which have accepted the write and erase instructions. The semiconductor disk pack may be connected, for example, to a standard bus in a personal computer.