Sanyo Electric Co., Ltd.

Takashi Kuroda

Iwao Honda

Hideki Ohashi

Noriyuki Tomita

Kazuhiro Nakamuta

An encoding circuit is disclosed which comprises: a data-for-encoding storing register that stores n-bit data for encoding; a data-for-calculation storing register that stores m-bit data for calculation generated by shifting the data for encoding; a shifter that shifts the data for encoding stored in the data-for-encoding storing register, and shifts and inputs the shifted data into the data-for-calculation storing register; a first coefficient register that stores m-bit first coefficient data indicating a first coefficient for executing encoding; a first logic circuit that is inputted with the data for calculation stored in the data-for-calculation storing register and the first coefficient data stored in the first coefficient register and outputs the logical product for each bit of the data for calculation and the first coefficient data; and a second logic circuit that is inputted with m-bit data outputted from the first logic circuit and outputs the exclusive logical sum of the m-bit data as the encoded data.

Encoding circuit and digital signal processing circuit

A memory access apparatus reading data from a memory, the memory including a terminal that address information is input to, a terminal that a clock signal changing at a predetermined cycle is input to, a terminal that a read command is input to, and a terminal that outputs data stored at an address identified by the address information at a timing of the clock signal changing from one level to the other level in accordance with the read command, the memory access apparatus comprising: an address information output unit that outputs the address information and the read command at a first timing of the clock signal changing from the one level to the other level; and a read data storage unit that stores data output from the memory at a second timing after the first timing of the clock signal changing from the one level to the other level, the read data storage unit storing the data at a third timing after the second timing of the clock signal changing from the one level to the other level.

Memory Access apparatus

A memory control circuit that controls m (=L/k) memories (first to mth memories), each of which has a k-bit width, the m memories storing data having a data width (D bits) of an integral multiple of k bits up to L bits, the circuit comprising: an address input circuit that determines a memory (nth memory) storing a first k bits of the data among the m memories, based on a start-position specification address which is a predetermined j bits of an A-bit address indicating a storage destination of the data, and inputs to the nth to mth memories a first specification address for specifying a storage destination of the data, the first specification address being an A-j bits of the A-bit address, which is the A-bit address without the predetermined j bits thereof, and inputs to the first to (n&#x2212;1)th memories a second specification address obtained by adding one to the first specification address; a data input circuit that inputs a plurality of pieces of divided data obtained by dividing the data into k-bit data to the memories respectively, in the order of the nth to mth memories and the first to (n&#x2212;1)th memories, based on the start-position specification address; a data output circuit that reads the plurality of pieces of divided data from the memories respectively, in the order of the nth to mth memories and the first to (n&#x2212;1)th memories, the number of the memories corresponding to the data width of the data, and outputs the read plurality of pieces of divided data as the data, based on the start-position specification address; and a memory selecting circuit that makes the D/k memories readable/writable, in the order of the nth to mth memories and the first to (n&#x2212;1)th memories, based on the start-position specification address and the data width of the data.

Memory control circuit and memory control method

A memory address generating apparatus comprising an address converting circuit, after setting a first setting region storing substitution source data and a second setting region storing substitution destination data that are a substitution target of the substitution source data in an address space provided by the memory, if a specified address specified by the processor as the access destination to the memory is included between a first beginning address and an end address of the first setting region, changing the specified address to a substitution destination address generated by adding a difference between the specified address and the first beginning address to a second beginning address of the second setting region.

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Gunma, Japan

Takashi Kuroda