To provide an interface circuit for fetching data inside according to asynchronous access from external input equipment for reducing the number of state transition protecting circuits, and reducing the number of access cycles from the external input equipment.
This interface circuit is provided with a state transition protecting circuit for stabilizing data from the external input equipment 101, a comparator circuit 102 for detecting the coincidence of the stabilized data from the external input equipment with data generated by an internal circuit, and for informing the external input equipment of the coincidence information, and a comparator auxiliary circuit 103 for detecting the non-coincidence of the data from the external input equipment with the data generated by the internal circuit 104, and for informing the external input equipment of the non-coincidence information.
Hironori Honda
Toshimitsu Ichikawa
Takeshi Takamatsu
Yuriko Hamada
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