Invention Grant
- Patent Title: Clock signal selection circuit
- Patent Title (中): 时钟信号选择电路
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Application No.: US12559896Application Date: 2009-09-15
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Publication No.: US08013637B2Publication Date: 2011-09-06
- Inventor: Takashi Shikata
- Applicant: Takashi Shikata
- Applicant Address: JP Yokohama
- Assignee: Fujitsu Semiconductor Limited
- Current Assignee: Fujitsu Semiconductor Limited
- Current Assignee Address: JP Yokohama
- Agency: Fujitsu Patent Center
- Main IPC: H03K17/00
- IPC: H03K17/00 ; G06F1/08

Abstract:
There is provided a clock signal selection circuit including: a first AND circuit (AND_A1) outputting a logical product signal of a clock selection signal and a first control signal; a second AND circuit (AND_A2) outputting a logical product signal of a logical inversion signal of the clock selection signal and a second control signal; a first flip-flop (FF_A2) inputting either the logical product signal that the first AND circuit outputs or a signal in accordance with the logical product signal, and outputting a logical inversion signal of a first output signal in synchronization with a first clock signal to the second AND circuit as the second control signal; and a second flip-flop (FF_B2) inputting either the logical product signal that the second AND circuit outputs or a signal in accordance with the logical product signal, and outputting a logical inversion signal of a second output signal in synchronization with a second clock signal to the first AND circuit as the first control signal.
Public/Granted literature
- US20100001767A1 CLOCK SIGNAL SELECTION CIRCUIT Public/Granted day:2010-01-07
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