Storage device and control method of storage device
View Patent ↗In a storage device having a redundancy remedy function in a block unit having a memory cells array divided in plural blocks, prior to the access operation to individual memory cells in the block, the block address BA for specifying a block is entered, and block redundancy is determined in the entered block address BA, and hence it is not necessary to determine input or redundancy of the block address BA on every occasion of the access operation. As a result, the time to the access operation start to the memory cell can be shortened, and the access speed is enhanced.
1. A control method in a storage device that comprises a memory cell array comprised of a plurality of blocks, and a redundancy remedy circuit for processing a redundancy remedy in each block, the control method comprising the steps of:
prior to an access operation for an individual memory cell, inputting a block address into a first block address buffer specifying at least one of the blocks that is associated with the individual memory cell and specifying the address of the individual memory cell;
processing a redundancy determination on the input block address prior to the access operation for the individual memory cell;
variably storing a serial block address in a second block address buffer that identifies a block to be accessed during a continuous access operation across blocks; and
selecting the first block address buffer during the access operation and the second block address buffer during the continuous access operation.
2. The control method of the storage device of claim 1 , wherein the step of inputting the block address includes processing in a specified command cycle, and inputting the block address through a data input/output terminal and/or an address terminal through which an address of the memory cell is specified in the block.
3. The control method of the storage device of claim 1 , further comprising the step of holding the input block address.
4. The control method of the storage device of claim 1 , further comprising the steps of:
holding the block address;
holding a serial block address instructing the block to be accessed during a continuous access operation over the blocks; and
selecting the held block address when the continuous access operation suspending, and selecting the held serial block address when the continuous access operation resuming.
5. A storage device that comprises a memory cell array comprised of a plurality of blocks, and a redundancy remedy circuit for processing a redundancy remedy in each block of the plurality of blocks as one unit for access control, the storage device comprising:
a first block address buffer for storing at least one of the block addresses and an individual memory cell address that are input in accordance with a specified command cycle prior to an access operation for the individual memory cell;
a block redundancy determination section that performs a redundancy determination in accordance with the input of the block address prior to the access operation for the individual memory cell;
a second block address buffer which variably stores a serial block address that identifies a block to be accessed during a continuous access operation across blocks; and
a switch section for selecting the first block address buffer during the access operation and the second block address buffer during the continuous access operation.
6. A wireless communications device, said wireless communications device comprising:
a flash memory system comprising:
a first block address buffer for storing at least one of the block addresses and an individual memory cell address that are input in accordance with a specified command cycle prior to an access operation for the individual memory cell; and
a block redundancy determination section that performs a redundancy determination in accordance with the input of the block address prior to the access operation for the individual memory cell;
a second block address buffer which variably stores a serial block address that identifies the block to be accessed during a continuous access operation across blocks; and
a switch section for selecting the first block address buffer during the access operation and the second block address buffer during the continuous access operation,
a processor;
a communications component;
a transmitter;
a receiver; and
an antenna connected to the transmitter circuit and the receiver circuit.
7. The wireless communications device of claim 6 , wherein said flash memory is NAND flash memory.
8. The wireless communications device of claim 6 , wherein said flash memory is NOR flash memory.
9. The wireless communications device of claim 6 , wherein said flash memory utilizes dual bit technology.
10. A computing device comprising:
a processor;
an input component;
an output component;
a memory comprising:
a volatile memory; and
a flash memory comprising:
a first block address buffer for storing at least one block address and an individual memory cell address that are input in accordance with a specified command cycle prior to an access operation for the individual memory cell; and
a block redundancy determination section that performs a redundancy determination in accordance with the input of the block address prior to the access operation for the individual memory cell;
a second block address buffer which variably stores a serial block address that identifies the block to be accessed during a continuous access operation across blocks; and
a switch section for selecting the first block address buffer during the access operation in the block, and selecting the second block address buffer during the continuous access operation.
11. The computing device of claim 10 , wherein said computing device is a personal computer (PC).
12. The computing device of claim 10 , wherein said computing device is a personal digital assistant (PDA).
13. The computing device of claim 10 , wherein said computing device is a gaming system.
14. A portable media player comprising:
a processor;
a cache;
a user input component;
a coder-decoder component; and
a memory comprising:
a flash memory comprising:
a first block address buffer for storing at least one block address and an individual memory cell address that are input in accordance with a specified command cycle prior to an access operation for the individual memory cell; and
a block redundancy determination section that performs a redundancy determination in accordance with input of the block address prior to the access operation for the individual memory cell;
a second block address buffer which variably stores a serial block address instructing the block to be accessed during a continuous access operation across blocks; and
a switch section for selecting the first block address buffer during the access operation and the second block address buffer during the continuous access operation.
15. The portable media player of claim 14 , wherein said portable media player is a portable music player.
16. The portable media player of claim 14 , wherein said portable media player is a portable video player.
17. An image capturing apparatus comprising:
a sensor for providing image data;
a memory capable of storing said image data, comprising:
a first block address buffer for storing at least one block address and an individual memory cell address that are input in accordance with a specified command cycle prior to an access operation for the individual memory cell; and
a block redundancy determination section that performs a redundancy determination in accordance with input of the block address prior to the access operation for the individual memory cell;
a second block address buffer which variably stores a serial block address instructing the block to be accessed during a continuous access operation over the blocks; and
a switch section for selecting the first block address buffer during the access operation in the block, and selecting the second block address buffer during the continuous access operation operated over the blocks; and
a display operable to display an image from said image data.