SEMICONDUCTOR INTEGRATED CIRCUIT

PROBLEM TO BE SOLVED: To transmit a signal suitable to a control system among circuit blocks by transmitting many signals with a small wiring number and a narrow wiring area, without constraining timings. SOLUTION: A multiplexer circuit 2 in a 1st circuit block 9 multiplexes control signals fed from an input terminal 1 on a transmission signal and transmits the multiplexed signal to a demultiplexer circuit 5 a 2nd circuit block 10. In this case, a coding circuit 4 encodes an enable signal at an enable terminal 3 of the 2nd circuit block 10 into a selection signal denoting a selection pattern of the multiplexer circuit 2 and gives the coded signal to the multiplexer circuit 2 of the 1st circuit block 9 to control the selection of the multiplexer circuit 2. Furthermore, the enable signal at the enable terminal 3 is also given to a demultiplexer circuit 5 of the 2nd circuit block 10 to control the demultiplexer circuit 5 in relation to the selection of the multiplexer circuit 2, to allow the demultiplexer circuit 5 demultiplex the multiplexed transmission signal received via a transmission signal line 7.