Patents by Inventor Yasushi Shibatsuka
Yasushi Shibatsuka has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).
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Publication number: 20080309383Abstract: A semiconductor integrated circuit includes a memory circuit, an oscillator circuit which generates an internal clock signal, based on control information held in the memory circuit, and a logic circuit which generates control information that causes the frequency of the internal clock signal to coincide with the frequency of an external clock signal. The internal clock signal is used for a synchronous operation of an internal circuit. Even if an error (undesired variation) occurs in the oscillation characteristic of the oscillator circuit due to process variations, it is possible to cause an internal clock signal frequency to coincide with an external clock signal frequency corresponding to a target frequency without the need for external attachment of a crystal oscillator and the input of an external clock signal.Type: ApplicationFiled: April 21, 2008Publication date: December 18, 2008Inventors: Naoki Yada, Yasuyuki Saito, Yasushi Shibatsuka, Katsunori Koike, Mitsuhiko Okutsu
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Patent number: 7382681Abstract: A semiconductor integrated circuit includes a memory circuit, an oscillator circuit which generates an internal clock signal, based on control information held in the memory circuit, and a logic circuit which generates control information that causes the frequency of the internal clock signal to coincide with the frequency of an external clock signal. The internal clock signal is used for a synchronous operation of an internal circuit. Even if an error (undesired variation) occurs in the oscillation characteristic of the oscillator circuit due to process variations, it is possible to cause an internal clock signal frequency to coincide with an external clock signal frequency corresponding to a target frequency without the need for external attachment of a crystal oscillator and the input of an external clock signal.Type: GrantFiled: February 21, 2007Date of Patent: June 3, 2008Assignees: Renesas Technology Corp., Hitachi Engineering Co., Ltd.Inventors: Naoki Yada, Yasuyuki Saito, Yasushi Shibatsuka, Katsunori Koike, Mitsuhiko Okutsu
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Publication number: 20070159914Abstract: A semiconductor integrated circuit includes a memory circuit, an oscillator circuit which generates an internal clock signal, based on control information held in the memory circuit, and a logic circuit which generates control information that causes the frequency of the internal clock signal to coincide with the frequency of an external clock signal. The internal clock signal is used for a synchronous operation of an internal circuit. Even if an error (undesired variation) occurs in the oscillation characteristic of the oscillator circuit due to process variations, it is possible to cause an internal clock signal frequency to coincide with an external clock signal frequency corresponding to a target frequency without the need for external attachment of a crystal oscillator and the input of an external clock signal.Type: ApplicationFiled: February 21, 2007Publication date: July 12, 2007Inventors: Naoki Yada, Yasuyuki Saito, Yasushi Shibatsuka, Katsunori Koike, Mitsuhiko Okutsu
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Patent number: 7196967Abstract: A semiconductor integrated circuit includes a memory circuit, an oscillator circuit which generates an internal clock signal, based on control information held in the memory circuit, and a logic circuit which generates control information that causes the frequency of the internal clock signal to coincide with the frequency of an external clock signal. The internal clock signal is used for a synchronous operation of an internal circuit. Even if an error (undesired variation) occurs in the oscillation characteristic of the oscillator circuit due to process variations, it is possible to cause an internal clock signal frequency to coincide with an external clock signal frequency corresponding to a target frequency without the need for external attachment of a crystal oscillator and the input of an external clock signal.Type: GrantFiled: June 5, 2006Date of Patent: March 27, 2007Assignees: Renesas Technology Corp., Hitachi Engineering Co., Ltd.Inventors: Naoki Yada, Yasuyuki Saito, Yasushi Shibatsuka, Katsunori Koike, Mitsuhiko Okutsu
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Patent number: 7193929Abstract: A semiconductor integrated circuit includes a memory circuit, an oscillator circuit which generates an internal clock signal, based on control information held in the memory circuit, and a logic circuit which generates control information that causes the frequency of the internal clock signal to coincide with the frequency of an external clock signal. The internal clock signal is used for a synchronous operation of an internal circuit. Even if an error (undesired variation) occurs in the oscillation characteristic of the oscillator circuit due to process variations, it is possible to cause an internal clock signal frequency to coincide with an external clock signal frequency corresponding to a target frequency without the need for external attachment of a crystal oscillator and the input of an external clock signal.Type: GrantFiled: June 5, 2006Date of Patent: March 20, 2007Assignees: Renesas Technology Corp., Hitachi Engineering Co., Ltd.Inventors: Naoki Yada, Yasuyuki Saito, Yasushi Shibatsuka, Katsunori Koike, Mitsuhiko Okutsu
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Publication number: 20060238216Abstract: A semiconductor integrated circuit includes a memory circuit, an oscillator circuit which generates an internal clock signal, based on control information held in the memory circuit, and a logic circuit which generates control information that causes the frequency of the internal clock signal to coincide with the frequency of an external clock signal. The internal clock signal is used for a synchronous operation of an internal circuit. Even if an error (undesired variation) occurs in the oscillation characteristic of the oscillator circuit due to process variations, it is possible to cause an internal clock signal frequency to coincide with an external clock signal frequency corresponding to a target frequency without the need for external attachment of a crystal oscillator and the input of an external clock signal.Type: ApplicationFiled: June 5, 2006Publication date: October 26, 2006Inventors: Naoki Yada, Yasuyuki Saito, Yasushi Shibatsuka, Katsunori Koike, Mitsuhiko Okutsu
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Publication number: 20060227650Abstract: A semiconductor integrated circuit includes a memory circuit, an oscillator circuit which generates an internal clock signal, based on control information held in the memory circuit, and a logic circuit which generates control information that causes the frequency of the internal clock signal to coincide with the frequency of an external clock signal. The internal clock signal is used for a synchronous operation of an internal circuit. Even if an error (undesired variation) occurs in the oscillation characteristic of the oscillator circuit due to process variations, it is possible to cause an internal clock signal frequency to coincide with an external clock signal frequency corresponding to a target frequency without the need for external attachment of a crystal oscillator and the input of an external clock signal.Type: ApplicationFiled: June 5, 2006Publication date: October 12, 2006Inventors: Naoki Yada, Yasuyuki Saito, Yasushi Shibatsuka, Katsunori Koike, Mitsuhiko Okutsu
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Patent number: 7061825Abstract: A semiconductor integrated circuit includes a memory circuit, an oscillator circuit which generates an internal clock signal, based on control information held in the memory circuit, and a logic circuit which generates control information that causes the frequency of the internal clock signal to coincide with the frequency of an external clock signal. The internal clock signal is used for a synchronous operation of an internal circuit. Even if an error (undesired variation) occurs in the oscillation characteristic of the oscillator circuit due to process variations, it is possible to cause an internal clock signal frequency to coincide with an external clock signal frequency corresponding to a target frequency without the need for external attachment of a crystal oscillator and the input of an external clock signal.Type: GrantFiled: June 15, 2004Date of Patent: June 13, 2006Assignees: Renesas Technology Corp., Hitachi Engineering Co., Ltd.Inventors: Naoki Yada, Yasuyuki Saito, Yasushi Shibatsuka, Katsunori Koike, Mitsuhiko Okutsu
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Publication number: 20050047265Abstract: A semiconductor integrated circuit includes a memory circuit, an oscillator circuit which generates an internal clock signal, based on control information held in the memory circuit, and a logic circuit which generates control information that causes the frequency of the internal clock signal to coincide with the frequency of an external clock signal. The internal clock signal is used for a synchronous operation of an internal circuit. Even if an error (undesired variation) occurs in the oscillation characteristic of the oscillator circuit due to process variations, it is possible to cause an internal clock signal frequency to coincide with an external clock signal frequency corresponding to a target frequency without the need for external attachment of a crystal oscillator and the input of an external clock signal.Type: ApplicationFiled: June 15, 2004Publication date: March 3, 2005Inventors: Naoki Yada, Yasuyuki Saito, Yasushi Shibatsuka, Katsunori Koike, Mitsuhiko Okutsu