Decision device for immediate modification of a structure

摘要

A decision device has a first to Kth decision circuit, which are respectively connected to a first to Kth request source, K representing a positive integer which is greater than one. Each of the first to Kth request sources is in communication with an external device. The decision device decides between the first to Kth request source with regard to the use of the external device in response to the first to Kth request signal. A kth of the first to kth decision circuits has a generation region, which responds to a kth request signal, for generating a kth enable signal to permit a kth request source to enter into communication with the external device if the kth decision circuit accepts the kth request signal, k representing a variable between 1 and K. A supply region supplies a kth inhibit signal to a (k+1)th to Kth decision circuit in order to terminate the generation of a (k+1)th to Kth enable signal if the kth decision circuit accepts the kth request signal.