Patent ID: 6938144
Filing Date: 2005-08-30
Classification: G06F

Abstract:
1. An address conversion unit for a memory device including a nonvolatile memory and RAM to be used to access the nonvolatile memory, the nonvolatile memory capable of erasing data in blocks and writing data in pages contained in a physical block, comprising: a first table on RAM to convert the specific number of bits of a logical address to a first physical address, the first physical address indicating a location of a second table; the second table on the nonvolatile memory to convert the other bits of the logical address to a second physical address, the second physical address being information to specify a physical address of a representative page of pages in the logical block specified by the logical address; and an access unit operable to access the nonvolatile memory in accordance with the logical address, wherein the access unit comprises: a unit operable to obtain the first physical address from the first table in accordance with the specific nunber of bits of the logical address: a unit operable to specify the second table by means of the obtained first physical address; a unit operable to obtain the second physical address from the specified second table in accordance with the other bits of the logical address; and a unit operable to access the nonvolatile memory by means of the obtained second physical address.