Студентам > Дипломные работы > Коммутатор цифровых каналов системы передачи
Коммутатор цифровых каналов системы передачиСтраница: 7/12
8.2.2 ПРИМЕР ТОПОЛОГИИ ВЫПОЛНЕНОЙ С УЧЕТОМ НОРМ
КОНСТРУКТИВНО - ТЕХНОЛОГИЧЕСКИХ ОГРАНИЧЕНИЙ
Проектирование топологии кристалла определяется
с одной стороны конструктивно-технологическими ограничениями, описанными
в предыдущем разделе, а с другой стороны - требованиями минимизации
площади, занимаемой схемой. Кроме того, выбранная архитектура кристалла
позволяет использовать предварительно разработанные библиотечные
элементы. К числу таких элементов относятся инвертор, двух-, трех- и
четырехпроводные логические элементы, триггеры различного назначения,
регистровые ячейки. Однако, требования миниатюризации, особенно для
блоков ОЗУ, привели к необходимости разработки оригинальных устройств.
На рисунках 8.1 и 8.2 показана разработанная топология запоминающей
ячейки и фрагмент ОЗУ из четырех ячеек.
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