Abstract: An example computer system includes at least two processors, a power supply controller, configuration registers, and a wake-up circuit. The computer system has a deep sleep mode in which the processors are not supplied with power. The power supply controller is configured to detect events of different types to be processed in the processors in the deep sleep mode. The configuration registers are configured to assign the processing to the different processors according to the type of event detected. The wake-up circuit is configured to disable deep sleep mode after an event is detected, and activate, when disabling deep sleep mode, a power supply of one of the at least two processor to which the processing of the detected event has been assigned according to the configuration registers. The activation of the power supply powering on one of the processors, which is configured to process the detected event.

Abstract: A compact and fast coder-decoder of the Reed-Solomon type and a reader, which comprises such a coder-decoder. The present invention provides a coder-decoder that includes specific registers that are divided into elementary cells set in series and comprising means of multiplexing and of calculation such that during a cycle of a clock signal the data of two of the registers are shifted from one cell and a calculation operation is carried out for one of the data and it is subsequently possible to exchange simultaneously the data between the two registers.

Abstract: A Reed-Solomon type error correction device carries out correction passes, and includes a first memory containing DVD type data, as well as CD type data after a first correction pass, for deinterleaving of the CD type data before a second correction pass. Additionally, a second memory of smaller capacity than the first memory, is provided for containing CD type data before correction, as well as deinterleaved CD type data. The invention concerns the error correction device and an optical disk reader containing such a device.