Определение функций переходов для асинхронного rs-триггера.
Управление данным триггером происходит по следующей схеме.
S |
Qt+1 |
|
R |
Qt+1 |
||||
0 |
1 |
|
0 |
1 |
||||
Qt |
0 |
1 |
0 |
|
Qt |
0 |
– |
1 |
1 |
1 |
– |
|
1 |
0 |
1 |
||
Таблицы управления асинхронным RS-триггером.
Пары S2–R2, S1–R1 управляют триггерами y2, y1 соответственно (см. таблицу кодирования состояний).
1. Функции перехода в линейном кодировании.
S2 |
00 |
01 |
11 |
10 |
00 |
0 |
1 |
1 |
1 |
01 |
0 |
– |
– |
0 |
11 |
0 |
– |
1 |
1 |
10 |
0 |
– |
– |
0 |
R2 |
00 |
01 |
11 |
10 |
00 |
1 |
0 |
0 |
– |
01 |
1 |
1 |
1 |
1 |
11 |
1 |
0 |
0 |
– |
10 |
1 |
1 |
1 |
1 |
S1 |
00 |
01 |
11 |
10 |
00 |
0 |
1 |
1 |
– |
01 |
1 |
0 |
– |
1 |
11 |
0 |
1 |
1 |
1 |
10 |
1 |
0 |
1 |
1 |
R1 |
00 |
01 |
11 |
10 |
00 |
1 |
– |
0 |
1 |
01 |
– |
1 |
1 |
0 |
11 |
1 |
– |
0 |
0 |
10 |
– |
1 |
0 |
0 |
2. Функции перехода в минимальном кодировании.
S2 |
000 |
001 |
011 |
010 |
110 |
111 |
101 |
100 |
00 |
0 |
1 |
1 |
1 |
– |
– |
– |
1 |
01 |
1 |
1 |
1 |
1 |
– |
– |
– |
1 |
11 |
1 |
1 |
1 |
1 |
– |
– |
– |
1 |
10 |
1 |
1 |
1 |
1 |
– |
– |
– |
1 |
R2 |
000 |
001 |
011 |
010 |
110 |
111 |
101 |
100 |
00 |
1 |
– |
– |
– |
– |
– |
– |
0 |
01 |
– |
– |
– |
– |
– |
– |
– |
0 |
11 |
– |
– |
– |
– |
– |
– |
– |
0 |
10 |
– |
– |
– |
– |
– |
– |
– |
0 |
S1 |
000 |
001 |
011 |
010 |
110 |
111 |
101 |
100 |
00 |
1 |
1 |
– |
– |
– |
– |
– |
1 |
01 |
1 |
1 |
– |
– |
– |
– |
– |
1 |
11 |
1 |
1 |
1 |
– |
– |
– |
– |
1 |
10 |
0 |
1 |
– |
1 |
– |
– |
– |
1 |
R1 |
000 |
001 |
011 |
010 |
110 |
111 |
101 |
100 |
00 |
– |
– |
1 |
1 |
– |
– |
– |
– |
01 |
– |
– |
1 |
1 |
– |
– |
– |
– |
11 |
– |
– |
0 |
1 |
– |
– |
– |
– |
10 |
1 |
– |
1 |
0 |
– |
– |
– |
– |
S0 |
000 |
001 |
011 |
010 |
110 |
111 |
101 |
100 |
00 |
1 |
1 |
– |
0 |
– |
– |
– |
0 |
01 |
1 |
1 |
1 |
1 |
– |
– |
– |
0 |
11 |
1 |
1 |
– |
1 |
– |
– |
– |
0 |
10 |
1 |
1 |
– |
1 |
– |
– |
– |
0 |
R0 |
000 |
001 |
011 |
010 |
110 |
111 |
101 |
100 |
00 |
– |
0 |
1 |
1 |
– |
– |
– |
1 |
01 |
– |
0 |
0 |
– |
– |
– |
– |
1 |
11 |
– |
0 |
1 |
– |
– |
– |
– |
1 |
10 |
– |
0 |
1 |
– |
– |
– |
– |
1 |
