Логическая схема одноразрядного двоичного сумматора
Разработка схемы коррекции.
Получим условие коррекции в случае запрещенной комбинации:
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Fзк |
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0 |
0 |
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1 |
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0 |
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1 |
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0 |
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1 |
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0 |
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0 |
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1 |
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0 |
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1 |
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4 |
не 4 |
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не 1 | ||
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не3 |
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не 2 |
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Fk= (¬γ8)∙(¬γ2) + (¬γ8)∙(¬γ4) + Пi=
Разработка схемы одноразрядного двоично-десятичного сумматора.
α8 Пi’
β8 Пi
α4
β4
γ8
α2
β2 Fk
γ4
α1
β1
γ2
γ1
Разработка преобразователя прямого кода в обратный для работы с отрицательными величинами.
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a8 |
a4 |
a2 |
a1 |
a'8 |
a'4 |
a'2 |
a'1 |
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Из таблицы сразу
видны уравнения функций
.
Остальные уравнения получаем с помощью
диаграмм Вейча:
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α1’ |
1 |
¬ 1 |
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¬ 0 |
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8 |
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¬ 2 | ||||
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¬8 |
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¬ 2 | |||||
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¬ 4 |
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¬ 4 |
¬ 4 |
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¬ 4 |
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α2’ |
1 |
¬ 1 |
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¬ 0 |
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¬ 0 |
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8 |
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¬8 |
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¬ 2 | |||||
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¬ 4 |
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¬ 4 |
¬ 4 |
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¬ 4 |
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α1’ =
α2’ =
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α4’ |
1 |
¬ 1 |
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¬ 0 |
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¬ 0 |
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1 |
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1 |
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¬ 2 | ||||
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¬8 |
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¬ 4 |
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¬ 4 |
¬ 4 |
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¬ 4 |
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α8’ |
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¬ 1 |
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¬ 0 |
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1 |
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¬8 |
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1 |
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¬ 4 |
4 |
¬ 4 |
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¬ 4 |
4 |
¬ 4 | ||||||
α4’ =
α8’ =
