CIRCUIT FOR LOGICAL EMULATION, LOGICAL BOARD WITH THE CIRCUIT, LOGICAL EMULATOR, AND COMMUNICATION METHOD IN LOGICAL EMULATION

PROBLEM TO BE SOLVED: To provide an apparatus and a method to control communication of time multiplexed data signal among asynchronous clock regions during hardware based emulation. SOLUTION: In a hardware-based logical emulation environment, communication of time multiplexed data signals among clock regions is controlled during emulation, by using a buffer 30 inserted into a common signal path among the asynchronous clock regions. Each data signal communicated across the path is latched through efficient use of the buffer 30 so that the regions receiving such signals extract the signals respectively at suitable points of evaluation cycles of the areas in a receiving circuit. Storage locations in the buffer 30 are associated with specified steps of evaluation cycles of the areas in a transmitting circuit and the receiving circuit, so that data writing and data reading are executed to the storage locations based on steps of present evaluations performed in each cycle in the transmitting and receiving circuits.