Semiconductor integrated circuit and image processing system using the same

A semiconductor integrated circuit comprising:

• an input terminal adapted to receive an input signal;
• an output terminal adapted to receive an output signal;
• a storage circuit for storing information corresponding to the input signal inputted from the input terminal, and for outputting to the output terminal, as the output signal, a signal corresponding to information selected from stored information, said selected information satisfying a specified condition;
• a control terminal adapted to receive a first control signal;
• a clock terminal adapted to receive a system clock;
• and
• a control circuit for generating a second control signal by converting the timing of the first control signal relative to the system clock, said second control signal controlling at least either input operation of inputting the input signal into the storage circuit or output operation of outputting the output signal from the storage circuit,
• wherein said storage circuit is configured to include a built-in content addressable memory macro, said content addressable memory macro being electrically connected to the input terminal and the output terminal,
• wherein said control circuit is electrically connected to the control terminal, the clock terminal, and the content addressable memory macro, and
• wherein said control circuit generates the second control signal from the first control signal on the basis of the system clock, and controls at least either the input operation or the output operation on the basis of the second control signal that has been generated.

An image processing system comprising:

• an image processing logic circuit;
• a storage circuit which is electrically connected to the image processing logic circuit, and which is configured to store an output of the image processing logic circuit, and to output stored information to the image processing logic circuit;
• and
• a control circuit which, if an operating frequency of a control signal for controlling input/output signals of the storage circuit differs from an operating frequency of a system clock, adjusts timing of the control signal to the system clock.