Renesas Electronics Corporation

Renesas Technology Corp.

Ntt Docomo, Inc.

Renesas Mobile Corporation

Takahiro Irita

Hiroyuki Mizuno

Kenji Hirose

Yusuke Kanno

Yoshihiko Yasu

Sho Yamanaka

Yoshihiko Hotta

Toshiyuki Hiraki

Tetsuya Yamada

Naohiko Irie

Masaki Fujigaya

Nobuhiko Honda

Kimihiko Nakazawa

Masayuki Kabasawa

Toshiyuki Kaya

Katsushige Matsubara

Ryoji Hashimoto

Takanobu Tsunoda

Katsuya Mizumoto

Kohei Wakahara

Yutaka Uchimura

Tsugio Matsuyama

Seiji Mochizuki

Kenichi Shimada

Tatsuya Kamei

Naozumi Morino

Koji Goto

Masayuki Ito

Hirotaka Hara

Tetsuya Shibayama

Tetsuji Tsuda

Kyohei Yamaguchi

Noriaki Sakamoto

Yasuto Igarashi

Hisashi Kato

Shinichi Shibahara

Yuki Hayakawa

Saneaki Tamaki

Keisuke Toyama

Kiyoshi Hayase

Jiro Hara

Kunihiko Nishiyama

Takao Koike

Akifumi Tsukimori

A semiconductor device includes first and second processor cores configured to perform a lock step operation and including first and second scan chains. The semiconductor device further includes a scan test control unit that controls a scan test of the first and second processor cores using the first and second scan chains, and a start-up control unit that outputs a reset signal for bringing the first and second processor cores into a reset state. The start-up control unit outputs an initialization scan request before the start of a lock step operation, and the scan test control unit performs an initialization scan test operation on the first and second processor cores by using an initialization pattern.

Semiconductor device and lock step startup control method for semiconductor device

In a data processing device comprising a memory controller controlling writing/reading of data to/from the memory, a processor requesting writing/reading of data, and an error detection module requesting writing/reading of data to/from the memory controller in accordance with a request from the processor, an error detection module calculates a first error detection code of the first data having a write request from the processor, reads the second data having a read request from the processor from the memory, calculates a second error detection code from the read data, compares the first error detection code and the second error detection code, and transmits the result of the comparison to the external module.

Data processing device and data processing method

Access control is achieved in consideration of write training. Masters issue access requests including a read request and a write request. A memory controller accesses memory in response to the access requests issued by the maters. A central bus-control system controls the output of the access requests issued by the masters to the memory controller. A training circuit conducts training on the memory while the access to the memory is stopped. The central bus-control system further controls the execution of the training on the memory. During the training, the central bus-control system suppresses the output of the read request to the memory controller from among the access requests issued by the masters.

Semiconductor device and access control method

A semiconductor device includes a master circuit which outputs a first write request signal for requesting to write data, a bus which receives the data and the first write request signal, a bus control unit which is arranged on the bus, generates an error detection code for the data and generates a second write request signal which includes second address information corresponding to first address information included in the first write request signal and memory controllers which each write the data into a storage area of an address designated by the first write request signal and writes the error detection code into a storage area of an address designated by the second write request signal in the storage areas of memories.

Semiconductor device and semiconductor system equipped with the same

A semiconductor device includes a first master and a second master configured to issue requests for accessing to a memory, a first request issuing controller coupled to the first master, and configured to hold the request issued from the first master, a second request issuing controller coupled to the second master, and configured to hold the request issued from the second master, a bus arbiter coupled to the first request issuing controller and the second request issuing controller, a memory controller coupled to the bus arbiter, and including a buffer configured to store the requests issued from the first master and the second master, and a central bus controller configured to grant access rights to the first request issuing controller and the second request issuing controller based on space information of the buffer.

Semiconductor device including a bus arbiter

When a plurality of write data is merged to generate a code for protecting data stored in the main memory, the write data is protected in the memory controller. A first code generation unit generates a first code based on the write data stored in a first sub memory, and stores the generated first code in a second sub memory. The sub memory controller reads the write data to be merged from the first sub memory, and verifies whether the read write data includes an error by using the first code stored in the second sub memory. When the read write data does not include an error, the sub memory controller merges valid data of the write data read from the first sub memory, and outputs the merged data to a second code generation unit. The second code generation unit generates a second code based on the merged data.

Semiconductor device, memory controller, and memory accessing method

A semiconductor integrated circuit device having a control signal system for avoiding failure to check an indefinite signal propagation prevention circuit, for facilitating a check included in an automated tool, and for facilitating a power shutdown control inside a chip. In the semiconductor integrated circuit device, power shutdown priorities are provided by independent power domains (Area A to Area I). A method for preventing a power domain having a lower priority from being turned OFF when a circuit having a high priority is turned ON is also provided.

Semiconductor integrated circuit device

A semiconductor device according to the present invention includes a plurality of masters (), a memory controller (), a bus that connects the plurality of masters () and the memory controller (), a QoS information register () that stores QoS information of the plurality of masters (), a right grant number controller () that calculates the number of grantable access rights based on space information of a buffer () of the memory controller (), a right grant selection controller () that selects the master () which will be granted the access right based on the QoS information of the QoS information register () and the number of grantable rights from the right grant number controller (), and a request issuing controller () that does not pass a request of the master () which has not been granted the access right from the right grant selection controller ().

Semiconductor device including bus controller

Disclosed is a semiconductor device capable of performing compression and decompression with increased appropriateness. The semiconductor device includes a computing module and a memory control module. The computing module includes a computing unit and a compression circuit. The computing unit performs arithmetic processing. The compression circuit compresses data indicative of the result of arithmetic processing. The memory control module includes an access circuit and a decompression circuit. The access circuit writes compressed data into a memory and reads written data from the memory. The decompression circuit decompresses data read from the memory and outputs the decompressed data to the computing module.

Semiconductor device, data processing system, and semiconductor device control method

Semiconductor device including a request issuing controller

Growing community of inventors

Tokyo, Japan

Takahiro Irita