Рынок
встраиваемого управления обслуживается в настоящее время 8 и 16-разрядными приборами
от большого количества поставщиков. Однако, в перспективных применениях с
высокими функциональными возможностями, эти приборы часто не обеспечивают
требуемой производительности. Вот почему для таких применений необходима
32-разрядная производительность процессоров RISC, объединенная с высокой
плотностью кода, характерной для 16-разрядных процессоров CISC. Технология
Thumb обеспечивает обе эти потребности, наводя мосты между 16-разрядными
системами и завтрашними 32-разрядными системами.
Высокая
производительности без добавочной стоимости
Фирма
ARM считает, что Thumb-ориентированные ядра будут особенно успешно
использоваться в применениях с относительно ограниченными возможностями, т.е. в
тех, в которых сегодня используют 8-разрядные и 16-разрядные контроллеры и
которым необходима большая производительность без дополнительных затрат.
Рисунок
7: Thumb-ориентированные ядра и занимаемая ими область производительности
Совместимость Исходного текста
Так
как Thumb-ориентированные ядра - просто расширение архитектуры ARM, разработчик
может компилировать коды Thumb, коды ARM или смесь обоих. Эта совместимость исходного
текста между Thumb-ориентированными ядрами и ядрами ARM, обеспечивает
беспроблемный путь к будущим обновлениям до 32-разрядных уже находящихся в
эксплуатации систем, что делает Thumb-ориентированные ядра гарантированным
вложением капитала в будущее.
Кроме
того, простота реализации технологии Thumb гарантирует, что перспективные ядра
ARM с еще более высокой производительностью также будут располагать
Thumb-ориентированными возможностями.
Рисунок
8: Прикладные области для Thumb-ориентированного ядра
ARM7TDMI
Первым
Thumb-ориентированным ядром стало ядро ARM7TDMI. Это ядро семейства ARM7
располагающее:
Встроенной
макроячейкой EmbeddedICE™, поддерживающей отладку встроенного ядра
32-разрядным
аппаратным умножителем
Декомпрессором
Thumb
32-разрядной
производительностью в 8- и 16-разрядных управляющих применениях
Ядро
ARM7TDMI пополнило стандартный ряд 32-разрядных ядер ARM, обеспечив возможность
выхода на рынок встраиваемого управления, привнося 32-разрядную
производительность в 8 и 16-разрядные применения управления. Первый
Thumb-ориентированный прибор в кремнии был выпущен во второй половине 1995.
Ядро
ARM7TDMI используется как лицензионная макроячейка ASIC ARM, предназначенная
использования при создании стандартных приборов специального назначения .
Thumb
версии стандартных ядер фирмы ARM, уже разработанных и находящихся в разработке,
способны принести еще более высокую производительность в 8 и 16-разрядный мир
встраиваемого управления. Технология уплотнения кода Thumb в сочетании с
уникальной производительностью StrongARM обеспечит уникальные по
производительности решения для применений со встраиваемым управлением, требующих
производительности на уровне рабочей станции.
Список литературы
Для
подготовки данной работы были использованы материалы с сайта gaw/
Другие работы по теме:
Семейство ARM9 Thumb
Наиболее активно ASIC стали развиваться с введением технологии программных ядер и программных библиотек периферийных компонентов, которые, по мере их развития, позволили создавать на одном кристалле достаточное большое количество функций.
Семейство ARM9E
Основными областями применения ядра могут быть контроллеры HDD, DVD и других устройств массовой памяти; контроллеры устройств распознавания и синтеза речи, средств кодирования и распространения речи по сетям и через Internet.
Thumb-ориентированное ядро ARM7TDMI и его развитие
Архитектура ARM является RISC архитектурой, и система команд и связанный с нею механизм декодирования намного проще, чем у микропрограммируемых CISC компьютеров, что приводит к высокой скорости обработки команд.
Концепция Thumb
Технология Thumb - дополнительное расширение к архитектуре ARM. Система команд Thumb содержит 36 команд, производных от стандартной 32-разрядной системы команд ARM, перекодированных в 16-разрядные коды.
Модель ядра атома и таблица элементов
Каждый последующий элемент отличается от предыдущего тем, что в его ядре количество протонов увеличивается на единицу, а количество нейтронов растет, в общем случае на несколько.
Карликовый длиннохвостый личинкоед
Введение 1 Описание 2 Распространение 3 Размножение 4 Питание 5 Галерея Список литературы Введение Карликовый длиннохвостый личинкоед[1] (лат. Pericrocotus cinnamomeus) — маленькая певчая птица из семейства личинкоедовых.
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