Patent application number | Description | Published |
20080244211 | MEMORY DEVICE AND CONTROLLER - A memory device comprises a nonvolatile memory including memory areas that are defined in accordance with a security levels, and a controller configured to write to a first area that is part of the memory areas in an M-value mode and to a second area that is part of the memory areas and provides lower security level than the first area in an N-value mode (N>M). | 10-02-2008 |
20080250220 | MEMORY SYSTEM - In a memory system according to an aspect of the invention, a nonvolatile semiconductor memory includes storage areas each composed of a group of storage elements, stores one or more than one bit of data into each of the storage elements and selects either a first write mode in which n bits or a second write mode in which n+1 bits are stored into each of the storage elements. A controller instructs the semiconductor memory to store data, for each of logical address groups each composed of logical addresses belonging to a specific range, by writing a part of the data allocated with the logical addresses included in the logical address group into a first number of the storage areas in the first write mode and writing another part of the data into a second number of the storage areas in the second write mode. | 10-09-2008 |
20090006725 | MEMORY DEVICE - A memory device includes a nonvolatile memory and a controller. The nonvolatile memory includes a storage area having a plurality of memory blocks each including a plurality of nonvolatile memory cells, and a buffer including a plurality of nonvolatile memory cells and configured to temporarily store data, and in which data is erased for each block. If a size of write data related to one write command is not more than a predetermined size, the controller writes the write data to the buffer. | 01-01-2009 |
20090055562 | SEMICONDUCTOR DEVICE WITH COPYRIGHT PROTECTION FUNCTION - A semiconductor device includes a serial communication interface connector, a non-volatile semiconductor memory, a memory controller, and a memory reader/writer. The serial communication interface connector is capable of being connected to a serial communication interface terminal of electronic equipment. The memory controller includes a memory interface connected to the non-volatile semiconductor memory and a copyright protection function and controls the non-volatile semiconductor memory. The memory reader/writer includes a controller interface connected to the memory controller and a serial communication interface connected to the serial communication interface connector. | 02-26-2009 |
20090055573 | SEMICONDUCTOR DEVICE CONNECTABLE TO MEMORY CARD AND MEMORY CARD INITIALIZATION METHOD - A semiconductor device includes first and second interfaces, and a control unit. The first interface is capable of being connected to a memory card and communicating with the memory card. The memory card has a nonvolatile semiconductor memory and has an unlock state and a lock state. The memory card in the unlock state permits an access to the nonvolatile semiconductor memory. The memory card in the lock state prohibits the access. The second interface is capable of being connected to a host device and communicating with the host device. The host device generates an access command to access the memory card. The control unit operates based on the access command sent from the host device through the second interface so as to release the lock state of the memory card, when the memory card is connected to the first interface. | 02-26-2009 |
20090125672 | MEMORY CARD AND HOST DEVICE THEREOF - A memory card is attached to a host device, and includes a data control circuit which transfers data with respect to the host device in synchronism with a rise edge and a fall edge of a clock signal. | 05-14-2009 |
20090125673 | MEMORY CARD AND HOST DEVICE THEREOF - A memory card is attached to a host device, and includes a data control circuit which transfers data with respect to the host device in synchronism with a rise edge and a fall edge of a clock signal. | 05-14-2009 |
20090248963 | MEMORY CONTROLLER AND MEMORY SYSTEM INCLUDING THE SAME - A memory system includes a memory system includes a nonvolatile memory including a memory space which is formatted from outside by an additional-write type file system, and a memory controller controlling the nonvolatile memory, the memory controller transmitting a write protect error when the memory controller is instructed to write data in an address which is equal to or smaller than an address of previously written data in an address area of the memory space. | 10-01-2009 |
20090282187 | FLASH MEMORY DEVICE CAPABLE OF PREVENTING READ DISTURBANCE - A storage has a first cache area temporarily storing one page data read from a flash memory, and a second cache area to which data of the first cache area is transferred. A controller stores data of the first cache area in the second cache area, and reads and outputs the data stored in the second cache area when data having the same address as data read from the first cache area is read. | 11-12-2009 |
20100023721 | MEMORY SYSTEM AND HOST DEVICE - A memory system includes a nonvolatile memory, and a memory controller for performing control to extend the maximum value of a logical address by erasing data of the nonvolatile memory which has become unnecessary in accordance with a command from the outside, and reassigning the data which has become unnecessary to a memory area assigned to a part of the logical address. | 01-28-2010 |
20100218064 | SEMICONDUCTOR MEMORY DEVICE INCORPORATING CONTROLLER - A semiconductor memory device includes a first nonvolatile memory, a second nonvolatile memory, a controller and an input/output bus. The first nonvolatile memory includes a plurality of memory cells having a first memory cell configuration. The second nonvolatile memory includes a plurality of memory cells having a second memory cell configuration different from the first memory cell configuration. The controller includes a first controller which controls the first nonvolatile memory, and a second controller which controls the second nonvolatile memory. An input/output bus is connected to the controller and is configured to exchange signals between an external apparatus and the controller. In accordance with a signal input via the input/output bus, the controller performs at least one of an operation of accessing the first nonvolatile memory by the first controller, and an operation of accessing the second nonvolatile memory by the second controller. | 08-26-2010 |
20100235564 | SEMICONDUCTOR MEMORY DEVICE - First conversion from a logical address to a physical address is performed, and data is written in to a region in a first storage region specified by the first conversion. Second conversion from a logical address to a physical address which is different from the first conversion is performed, and data is written into a region in a second storage region specified by the second conversion. When the controller detects sequential writing having a predetermined length or more, it shifts to a first write mode that data is written into the first storage region. When the controller detects that a difference between a logical address at the end of a previous write operation and a logical address at the start of a subsequent write operation is not present in a predetermined range, it shifts to a second write mode that data is written into the second storage region. | 09-16-2010 |
20100250839 | METHOD FOR CONTROLLING MEMORY CARD AND METHOD FOR CONTROLLING NONVOLATILE SEMICONDUCTOR MEMORY - A method for controlling a memory card which includes a nonvolatile semiconductor memory whose memory area includes a plurality of write areas is disclosed. A first area which is a part of the plurality of write areas is set in accordance with management executed by a first file system. The first file system sequentially writes data along a direction in which addresses of the plurality of write areas increase. A second area which is a part of the plurality of write areas is set in accordance with management executed by a second file system. The second file system writes data in an order which does not depend on the addresses. | 09-30-2010 |
20110113188 | MEMORY CARD AND HOST DEVICE THEREOF - A memory card is attached to a host device, and includes a data control circuit which transfers data with respect to the host device in synchronism with a rise edge and a fall edge of a clock signal. | 05-12-2011 |
20110161386 | SEMICONDUCTOR DEVICE WITH A PLURALITY OF WRITE CONDITIONS AND MEMORY SYSTEM - According to one embodiment, a semiconductor device includes a semiconductor memory device and a memory controller. The semiconductor memory device is capable of holding data. The memory controller controls write operation to write data received from a host unit into the semiconductor memory device. The memory controller includes a logical address space including a plurality of address areas each having a write limiting condition according to an address and a type of data to be written into the semiconductor memory device, permitting an adding a file and inhibiting a written file from being overwritten in a specific file format. | 06-30-2011 |
20110191531 | MEMORY DEVICE AND CONTROL METHOD THEREOF - A control method of a memory device including a storage area formed of a nonvolatile semiconductor memory, includes updating a file stored in the storage area by using a file system which supports an incremental write method, recording, in the storage area, an allocation table representing a correlation between a logical address indicating a recording position of the file and a virtual address representing a virtual recording position of the file and management information of the allocation table, and recording position information representing a recording position of the management information in a position information area of the storage area. | 08-04-2011 |
20110231609 | METHOD OF CONTROLLING SEMICONDUCTOR MEMORY CARD SYSTEM - A method of controlling a semiconductor memory card system including a host device incorporating a semiconductor memory card and communicating information with a user of the host device to warn the imminent end of the life of the memory card in the system is provided. According to one aspect, there is provided a method of controlling a semiconductor memory card, the method comprising creating end-of-life index data of the semiconductor memory card, reading the end-of-life index data in response to a command from a host device to the semiconductor memory card, creating an end-of-life warning status of the semiconductor memory card from the end-of-life index data based on a life control limit value, and sending a response containing the end-of-life warning status to the host device as a response to the command through the same communication line as that for the command. | 09-22-2011 |
20120036313 | METHOD FOR CONTROLLING MEMORY CARD AND METHOD FOR CONTROLLING NONVOLATILE SEMICONDUCTOR MEMORY - A method for controlling a memory card which includes a nonvolatile semiconductor memory whose memory area includes a plurality of write areas is disclosed. A first area which is a part of the plurality of write areas is set in accordance with management executed by a first file system. The first file system sequentially writes data along a direction in which addresses of the plurality of write areas increase. A second area which is a part of the plurality of write areas is set in accordance with management executed by a second file system. The second file system writes data in an order which does not depend on the addresses. | 02-09-2012 |
20120137057 | MEMORY DEVICE - A memory device includes a nonvolatile memory and a controller. The nonvolatile memory includes a storage area having a plurality of memory blocks each including a plurality of nonvolatile memory cells, and a buffer including a plurality of nonvolatile memory cells and configured to temporarily store data, and in which data is erased for each block. If a size of write data related to one write command is not more than a predetermined size, the controller writes the write data to the buffer. | 05-31-2012 |
20130036257 | MEMORY SYSTEM WHICH CAN AVOID UNAVAILABILITY DUE TO OPERATION ERROR BY USER - According to one embodiment, a memory system includes a nonvolatile semiconductor storage device and controller. The nonvolatile semiconductor storage device has a file system area including a file allocation table (FAT), a data write-once area including a plurality of clusters, and a management information area which stores a pointer indicating a rewrite inhibition area of the clusters. The controller reads the FAT from the file system area of the nonvolatile semiconductor storage device, and sets the pointer based on a cluster use status recorded in the FAT. | 02-07-2013 |
20130198441 | SEMICONDUCTOR DEVICE WITH COPYRIGHT PROTECTION FUNCTION - A semiconductor device includes a serial communication interface connector, a non-volatile semiconductor memory, a memory controller, and a memory reader/writer. The serial communication interface connector is capable of being connected to a serial communication interface terminal of electronic equipment. The memory controller includes a memory interface connected to the non-volatile semiconductor memory and a copyright protection function and controls the non-volatile semiconductor memory. The memory reader/writer includes a controller interface connected to the memory controller and a serial communication interface connected to the serial communication interface connector. | 08-01-2013 |
20150026396 | MEMORY CARD AND HOST DEVICE THEREOF - A memory card is attached to a host device, and includes a data control circuit which transfers data with respect to the host device in synchronism with a rise edge and a fall edge of a clock signal. | 01-22-2015 |