طراحی ضرب‌کننده‌های ممیز- شناور با قابلیت کار در مدهای عادی و تحمل‌پذیر اِشکال با استفاده از کاهش دقت محاسبات
الموضوعات :مریم مهاجر 1 , مجتبی ولی‌نتاج 2
1 - دانشگاه صنعتی نوشیروانی بابل
2 - مهندسی برق و کامپیوتر
الکلمات المفتاحية: دقت کاهش‌یافتهتحمل‌پذیری اشکالتشخیص خطاتصحیح خطاضرب‌کننده ممیز- شناور,
ملخص المقالة :
عملیات ضرب یکی از مهم‌ترین محاسبات مورد استفاده در انواع پردازش‌های سیگنال خصوصاً صوت و تصویر محسوب می‌شود. با این حال، ضرب‌کننده‌ها به عنوان مدارهای دیجیتالی به خاطر وجود عوامل محیطی گوناگون مانند انواع نویزها مستعد تولید خروجی‌های نادرست هستند. در این مقاله، روشی جدید برای طراحی ضرب‌کننده ممیز- شناور 32بیتی ارائه می‌شود که می‌تواند با توجه به شرایط محیطی که در آن استفاده می‌شود، در دو مد کاری عادی یا تحمل‌پذیر اشکال عمل کند. در مد تحمل‌پذیر اشکال، با کاهش دقت محاسبات و قبول مقدار ناچیزی خطای محاسباتی در خروجی، بخشی از مدار اولیه آزاد شده و برای فراهم‌کردن محاسبات افزونه به منظور تشخیص یا تصحیح خطاهای ناشی از اشکال‌ها استفاده می‌شود. بدین روش، دو معماری ضرب‌کننده با قابلیت تشخیص یا تصحیح خطا پیشنهاد می‌شوند که در مد کاری تحمل‌پذیر اشکال، دارای قابلیت اطمینان مناسبی در برابر انواع اشکال‌های دائمی و گذرا هستند. نتایج پیاده‌سازی نشان می‌دهد که در مد تحمل‌پذیر اشکال به جای 23 بیت مانتیس اولیه، حفظ 13 بیت برای دست‌یافتن به ضرب‌کننده با قابلیت تشخیص خطا و حفظ 11 بیت برای دست‌یافتن به ضرب‌کننده با قابلیت تصحیح خطا، با سربار مساحت و توان قابل قبول که از 12% تا 26% خواهد بود و همچنین حفظ دقت مورد نیاز برای اکثر کاربردها، مناسب است.
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