Mitsubishi Denki Kabushiki Kaisha

Renesas Technology Corp.

Maiko Taruki

Tadashi Sakamoto

A comparison circuit compares a burst access request from a bus controller with an access mode that is supported by an external memory device and that is set in a device information setting register. When the burst access request does not match the access mode that is supported by the external memory device, a control signal generation circuit accesses the external memory device in an access mode different from that of the burst access request from the bus controller. At this time, the control signal generation circuit controls the external memory device so that the data is output to the bus controller in the order corresponding to the burst access request from the bus controller. This enables the bus controller to read the correct data according to the burst access request.

Memory controller and memory control method for controlling an external memory device to be accessible even in an addressing mode that is not supported thereby

An MPEG-1 audio layer III decoding device, which can perform fast decoding of MP3 by performing fast inverse quantization of Huffman code data, includes a bit stream decomposing portion for decomposing an input bit stream of MP3 into side information including bit allocation information and Huffman table information, a scale factor and Huffman code data; a scale factor decoder for decoding the scale factor decomposed from the bit-stream based on the side information; a Huffman decoder for decoding the Huffman code data decomposed from the bit-stream based on the Huffman table information included in the side information; a zero detecting portion for detecting a band of the Huffman code data all providing values of zero; an inverse quantizer for performing inverse quantizing processing on the Huffman code data based on the output of the zero detecting portion, the side information, the scale factor and the Huffman code data; and a hybrid filter bank portion for inversely mapping and decoding the output of the inverse quantizer into a time region signal.

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Hyogo, Japan

Maiko Taruki