根據題目的描述, 得到狀態表.
狀態表 | |||||||
X | Q2 | Q1 | Q0 | Q2* | Q1* | Q0* | Z |
0 | 0 | 0 | 0 | 0 | 0 | 1 | 0 |
0 | 0 | 0 | 1 | 0 | 1 | 0 | 0 |
0 | 0 | 1 | 0 | 0 | 1 | 1 | 0 |
0 | 0 | 1 | 1 | 1 | 0 | 0 | 0 |
0 | 1 | 0 | 0 | 1 | 0 | 1 | 0 |
0 | 1 | 0 | 1 | 0 | 0 | 0 | 1 |
0 | 1 | 1 | 0 | × | × | × | 0 |
0 | 1 | 1 | 1 | × | × | × | 0 |
1 | 0 | 0 | 0 | 0 | 0 | 1 | 0 |
1 | 0 | 0 | 1 | 0 | 1 | 0 | 0 |
1 | 0 | 1 | 0 | 0 | 1 | 1 | 0 |
1 | 0 | 1 | 1 | 1 | 0 | 0 | 0 |
1 | 1 | 0 | 0 | 0 | 0 | 0 | 1 |
1 | 1 | 0 | 1 | × | × | × | 0 |
1 | 1 | 1 | 0 | × | × | × | 0 |
1 | 1 | 1 | 1 | × | × | × | 0 |
根據狀態表, 得到狀態激勵表.
狀態激勵表 | |||||||
X | Q2 | Q1 | Q0 | D2 | D1 | D0 | Z |
0 | 0 | 0 | 0 | 0 | 0 | 1 | 0 |
0 | 0 | 0 | 1 | 0 | 1 | 0 | 0 |
0 | 0 | 1 | 0 | 0 | 1 | 1 | 0 |
0 | 0 | 1 | 1 | 1 | 0 | 0 | 0 |
0 | 1 | 0 | 0 | 1 | 0 | 1 | 0 |
0 | 1 | 0 | 1 | 0 | 0 | 0 | 1 |
0 | 1 | 1 | 0 | × | × | × | 0 |
0 | 1 | 1 | 1 | × | × | × | 0 |
1 | 0 | 0 | 0 | 0 | 0 | 1 | 0 |
1 | 0 | 0 | 1 | 0 | 1 | 0 | 0 |
1 | 0 | 1 | 0 | 0 | 1 | 1 | 0 |
1 | 0 | 1 | 1 | 1 | 0 | 0 | 0 |
1 | 1 | 0 | 0 | 0 | 0 | 0 | 1 |
1 | 1 | 0 | 1 | × | × | × | 0 |
1 | 1 | 1 | 0 | × | × | × | 0 |
1 | 1 | 1 | 1 | × | × | × | 0 |
用4片74151分別實現D0、D1、D2和Z的邏輯表達式.
根據上面的分析, 繪製電路的原理圖.