SHARC Processors
Analog Devices' 32-Bit Floating-Point SHARC® Processors are based on a Super Harvard architecture that balances exceptional core and memory performance with outstanding I/O throughput capabilities. This "Super" Harvard architecture extends the original concepts of separate program and data memory busses by adding an I/O processor with its associated dedicated busses. In addition to satisfying the demands of the most computationally intensive, real-time signal-processing applications, SHARC processors integrate large memory arrays and application-specific peripherals designed to simplify product development and reduce time to market.
COMMON ARCHITECTURAL FEATURES OF SHARC
32/40-Bit IEEE Floating-Point Math
32-Bit Fixed-Point Multipliers with 64-Bit Product & 80-Bit Accumulation
No Arithmetic Pipeline; All Computations Are Single-Cycle
Circular Buffer Addressing Supported in Hardware
32 Address Pointers Support 32 Circular Buffers
Six Nested Levels of Zero-Overhead Looping in Hardware
Rich, Algebraic Assembly Language Syntax
Instruction Set Supports Conditional Arithmetic, Bit Manipulation, Divide & Square Root, Bit Field Deposit and Extract
DMA Allows Zero-Overhead Background Transfers at Full Clock Rate Without Processor Intervention
First Generation SHARC products offer performance to 66 MHz/ 198 MFLOPs and form the cornerstone of the SHARC processor family. Their easy-to-use Instruction Set Architecture that supports both 32-bit fixed-point and 32/40-bit floating data formats combined with large memory arrays and sophisticated communications ports make them suitable for a wide array of parallel processing applications including consumer audio, medical imaging, military, industrial, and instrumentation.
Second Generation SHARC products double the level of signal processing performance (100MHz / 600MFLOPs) offered by utilizing a Single-Instruction, Multiple-Data (SIMD) architecture. This hardware extension to first generation SHARC processors doubles the number of computational resources available to the system programmer. Second generation products contain dual multipliers, ALUs, shifters, and data register files - significantly increasing overall system performance in a variety of applications. This capability is especially relevant in consumer, automotive, and professional audio where the algorithms related to stereo channel processing can effectively utilize the SIMD architecture.
Third Generation SHARC products employ an enhanced SIMD architecture that extends CPU performance to 450 MHz/2700 MFLOPs. These products also integrate a variety of ROM memory configurations and audio-centric peripherals design to decrease time to market and reduce the overall bill of materials costs. This increased level of performance and peripheral integration allow third generation SHARC processors to be considered as single-chip solutions for a variety of audio markets.
The fourth generation of SHARC® Processors, now includes the ADSP-21486, ADSP-21487, ADSP-21488, ADSP-21489 and offers increased performance, hardware-based filter accelerators, audio and application-focused peripherals, and new memory configurations capable of supporting the latest surround-sound decoder algorithms. All devices are pin-compatible with each other and completely code-compatible with all prior SHARC Processors. These newest members of the fourth generation SHARC Processor family are based on a single-instruction, multiple-data (SIMD) core, which supports both 32-bit fixed-point and 32-/40-bit floating-point arithmetic formats making them particularly suitable for high-performance audio applications
Fourth-generation SHARC Processors also integrate application-specific peripherals designed to simplify hardware design, minimize design risks, and ultimately reduce time to market. Grouped together, and broadly named the Digital Applications Interface (DAI), these functional blocks may be connected to each other or to external pins via the software-programmable Signal Routing Unit (SRU). The SRU is an innovative architectural feature that enables complete and flexible routing amongst DAI blocks. Peripherals connected through the SRU include but are not limited to serial ports, IDP, S/PDIF Tx/Rx, and an 8-Channel asynchronous sample rate converter block. The fourth generation SHARC allows data from the serial ports to be directly transferred to external memory by the DMA controller. Other peripherals such as SPI,UART and Two-Wire Interface are routed through a Digital Peripheral Interface (DPI).
TigerSHARC
The TigerSHARC DSP is an ultra-high-performance static superscalar architecture that is optimized for telecommunications infrastructure and other computationally demanding applications. This unique architecture combines elements of RISC, VLIW, and standard DSP processors to provide native support for 8, 16, and 32-bit fixed, as well as floating-point data types on a single chip.
Large on-chip memory, extremely high internal and external bandwidths and dual compute blocks provide the necessary capabilities to handle a vast array of computationally demanding, large signal processing tasks.
Strictly speaking, the term "DSP" applies to any microprocessor that operates on digitally represented signals. most DSP processors include specialized on-chip peripherals or I/O interfaces that allow the processor to efficiently interface with other system components, such as analog-to-digital converters and host processors.
The TigerSHARC DSP provides leading edge system performance while keeping the highest possible flexibility in software and hardware development - flexibility without compromise. This concept will allow wireless infrastructure manufacturers to continue adapting to the evolving 3G standards while deploying a highly optimized and effective Node B solution that will realize significant overall cost savings.For general purpose multiprocessing applications, TigerSHARC DSP's balanced architecture optimizes system, cost, power and density. A single TigerSHARC DSP, with its large on-chip memory, zero overhead DMA engine, large I/O throughput, and integrated multiprocessing support, has the necessary integration to be a complete node of a multiprocessing system. This enables a multiprocessor network exclusively made up of TigerSHARCS without any expensive and power consuming external memories or logic.
The ADSP-TS101S, the latest member of the TigerSHARC DSP family can execute 2.0 billion MACs per second while achieving the world's highest floating-point DSP performance. The TigerSHARC DSP's parallelism capabilities allow for up to four 32-bit instructions per cycle while an enhanced communication instruction set reduces some of the mountainous signal processing functions associated with wireless down to a manageable level. The ADSP-TS101S also provides an unmatched level of both internal and external bandwidth that enable high computation rates and high data rate processing.
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