| 摘要 |
PURPOSE:To exceed plural logical operations with a PLA, by selecting and using only prescribed one of product member lines forming an array. CONSTITUTION:When the signal which is effective to a selection terminal S1 and ineffective to a selection terminal S2 is supplied, the part of A1 becomes effective in terms of an AND array part 1 and an OR array part 2. Therefore the logical operations as shown by the following equations for the information applied to a-d of an input terminal 11 to obtain outputs X, Y and Z: X= a.b, Y=a.b.c+d, Z=c+d. Then the signal which is effective to the terminal S2 and ineffective to the terminal S1 is applied, the part of A2 becomes effective for each array. Thus it is possible to carry out logical operations as shown by the following equations: X=a+b, Y=a+b+c and Z=a.b.c.d. |
