PURPOSE: To intend to decrease the number of total selectors by forming matrices by multistage, and by decreasing the number of selectors which are provided at the part of multistage matrices.
CONSTITUTION: Matrices consists of small matrix groups L10, L20∼ in the X axis direction and small matrix groups M1∼Mn in the Y axis direction. For the small matrix M1, selectors SW are provided at all intersection points of drop circuits m1y1∼m2ym and selection lines m1x1∼m1xm. On the other hand, for the small matrices L10, L20∼, the selectors SW are provided at only diagonal intersection points of selection lines m1x1∼m1xm and local lines l1x1, l1x2∼ of the small matrix M1. Thus, matrices are formed by multistage and the number of selectors of the other is decreased. Therefore, the number of total selectors can be decreased.
KURATA MASAAKI