International Business Machines Corporation

Toru Michigami

Keisuke Tanaka

Arimasa Naitoh

Yukifumi Nakazawa

A leak current is prevented from flowing during a power off state in a power supply unit having a remote power on/off function by using the momentary switch. In a state of power off, i.e. a state in which a switch SW is turned off, power is not applied to a latch circuit and hence power is not consumed. A switch drive circuit does not consume power. When a user depresses a momentary switch SW during a state that the switch SW is turned off, the switch drive circuit turns the switch SW on. As a result, the latch circuit can receive a drive voltage V from a node located down stream of the switch SW so that it can store or latch the turn on state of the momentary switch SW After that, when the user releases the momentary switch SW it returns to an original position and operation of the switch drive circuit which turns the switch SW on is terminated. However, at this point of time, it becomes possible to maintain the turn on state of the switch SW by the operation of the latch circuit

Power supply unit and electronic apparatus for preventing a leak current

A method and apparatus for high-speed memory management of ECC product-coded data arrays read back from DVD storage subsystems in which rows of length Y&lE;2,&times;(2m&plus;1) of the array are read from disk and written in alternate blocks of 2,bytes per block and (2m&plus;1) blocks per row into successive addresses of a synchronous dynamic random access memory (SDRAM) operable both as a buffer and an interleaved pair of memories. Array data is subjected to detection and correction of error and/or erasure by ECC processing of data extracted from and rewritten into the SDRAM, the array being extracted, ECC processed, and rewritten to and from the SDRAM in block interleave column major order and then in block interleave row major order.

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Fujisawa, Japan

Toru Michigami