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CIRCUIT FOR DECODING VARIABLE-LENGTH CODE, AND SYSTEM FOR DECODING VARIABLE-LENGTH CODE WHICH USES THE CIRCUIT.
CIRCUIT FOR DECODING VARIABLE-LENGTH CODE, AND SYSTEM FOR DECODING VARIABLE-LENGTH CODE WHICH USES THE CIRCUIT.
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机译:用于解码可变长度代码的电路以及用于解码使用该电路的可变长度代码的系统。
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摘要
A circuit comprising a pair of a CAM cell (10) for storing variable-length codes and a RAM cell (20) for storing data used for mask processing. This circuit further has an NMOS (30) which is connected between the CAM cell (10) and a match line ML, and cuts off the CAM cell (10) from the match line ML by use of the output of the RAM cell (20). The CAM cell (10) checks a code applied from the outside with the code stored in it. If these codes are agreed with each other, the CAM cell (10) outputs an H level signal which represents the agreement to the match line ML. If disagreed, it outputs an L level signal which represents the disagreement to the match line ML. If the CAM cell does not engage in the checking operation, the corresponding RAM cell (20) outputs an L level signal to turn off the NMOS (30). When the NMOS is turned off, the output from the CAM cell (10) is not transmitted to the match line ML.
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