已知ROM的数据表如表7.7所示,若将地址输入A3,A2,A1,A0作为输入逻辑变量,将数据输出D3,D2,D1,D0作为函数输出
已知ROM的数据表如表7.7所示,若将地址输入A3,A2,A1,A0作为输入逻辑变量,将数据输出D3,D2,D1,D0作为函数输出,试写出输出与输入间的逻辑函数式,并化为最简“与-或”形式。
表7.7 | |||||||
地 址 输 入 | 数 据 输 出 | ||||||
A3 | A2 | A1 | A0 | D3 | D2 | D1 | D0 |
0 | 0 | 0 | 0 | 0 | 0 | 0 | 1 |
0 | 0 | 0 | 1 | 0 | 0 | 1 | 0 |
0 | 0 | 1 | 0 | 0 | 0 | 1 | 0 |
0 | 0 | 1 | 1 | 0 | 1 | 0 | 0 |
0 | 1 | 0 | 0 | 0 | 0 | 1 | 0 |
0 | 1 | 0 | 1 | 0 | 1 | 0 | 0 |
0 | 1 | 1 | 0 | 0 | 1 | 0 | 0 |
0 | 1 | 1 | 1 | 1 | 0 | 0 | 0 |
1 | 0 | 0 | 0 | 0 | 0 | 1 | 0 |
1 | 0 | 0 | 1 | 0 | 1 | 0 | 0 |
1 | 0 | 1 | 0 | 0 | 1 | 0 | 0 |
1 | 0 | 1 | 1 | 1 | 0 | 0 | 0 |
1 | 1 | 0 | 0 | 0 | 1 | 0 | 0 |
1 | 1 | 0 | 1 | 1 | 0 | 0 | 0 |
1 | 1 | 1 | 0 | 1 | 0 | 0 | 0 |
1 | 1 | 1 | 1 | 0 | 0 | 0 | 1 |