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ARM System Developer’s Guide phần 9

Đây là loại bộ nhớ cache được biết đến như một bộ nhớ cache thống nhất. Một bộ nhớ cache thống nhất bao gồm cả hướng dẫn và giá trị dữ liệu. Các kiến trúc Harvard có hướng dẫn riêng biệt và xe buýt dữ liệu để cải thiện hiệu suất hệ thống tổng thể | 15.1 Advanced DSP AND SIMD SUPPORT IN ARMv6 15.1.1 SIMD Arithmetic Operations 15.1.2 Packing Instructions 15.1.3 Complex Arithmetic Support 15.1.4 Saturation Instructions 15.1.5 Sum of Absolute Differences Instructions 15.1.6 Dual 16-Bit Multiply Instructions 15.1.7 Most Significant Word Multiplies 15.1.8 Cryptographic Multiplication Extensions 15.2 System and Multiprocessor Support Additions to ARMv6 15.2.1 Mixed-Endianness Support 15.2.2 Exception Processing 15.2.3 Multiprocessing Synchronization Primitives 15.3 ARMv6 Implementations 15.4 Future Technologies beyond ARMv6 15.4.1 TrustZone 15.4.2 Thumb-2 15.5 Summary Chapter The Future OF the Architecture 15 John Rayfield In October 1999 ARM began to consider the future direction of the architecture that would eventually become ARMv6 first implemented in a new product called ARM1136J-S. By this time ARM already had designs for many different applications and the future requirements of each of those designs needed to be evaluated as well as the new application areas for which ARM would be used in the future. As system-on-chip designs have become more sophisticated ARM processors have become the central processors in systems with multiple processing elements and subsystems. In particular the portable and mobile computing markets were introducing new software and performance challenges for ARM. Areas that needed addressing were digital signal processing DSP and video performance for portable devices interworking mixed-endian systems such as TCP IP and efficient synchronization in multiprocessing environments. The challenge for ARM was to address all of these market requirements and yet maintain its competitive advantage in computational efficiency computing power per mW as the best in the industry. This chapter describes the components within ARMv6 introduced by ARM to address these market requirements including enhanced DSP support and support for a multiprocessing environment. The chapter also introduces the first .