Memory card and memory card system
AssigneeMatsushita Electric Industrial Co., Ltd.
InventorsTakeshi Otsuka, Haruo Ohta
Life of this patent
Estimating the term…
Abstract
A memory card is equipped in a host apparatus and used for data recording. The memory card has a built-in flash memory and an internal ROM, there is prestored a predetermined writable block size corresponding to a certain integral multiple of a size of an erase block. A write block size of a write command issued by the host apparatus. The data size is detected and compared to the writable block size, so as to decide whether the write block size is an integral multiple of the writable block size, thereby judging whether write is permitted. Only when the write is permitted, data is written from the host apparatus into the memory card. If the write is not permitted, a response to inform an error is returned to the host apparatus.
Claims9
A memory card comprising:
- a flash memory;
- an external interface unit operable to transfer data to and from a host apparatus;
- a storage unit that prestores a predetermined writable block size;
- and
- a controlling unit operable, when receiving through the external interface unit a write command which specifies a write block size, to (a) judge whether the write block size satisfies a predetermined condition in relation to the writable block size and (b) perform a control operation concerning whether to permit writing of data into the flash memory according to a result of the judgment.
Dependencies are inferred from the claim text.