DSP芯片ADSP21020解密研究及性能分析

　ADSP21020芯片解密是龙芯世纪科技目前成功破解的典型DSP系列芯片解密型号，针对DSP系列芯片解密，龙芯世纪科技已经取得全乡突破，可以针对各种典型芯片提供极具可靠性和经济价值的解密方案。
　有ADSP21020芯片解密等疑难系列芯片解密需求者欢迎与我们联系咨询更多合作详情，本文，我们仅对DSP系列ADSP21020芯片的内部功能特征做简单介绍，供客户及解密工程师进行技术参考和借鉴。因为在芯片解密过程中，只有深入理解芯片内部结构及其加解密性质，才能更好的保证IC解密技术过程的实现和安全可靠。
GENERAL DESCRIPTION
   The ADSP21020 is the first member of Analog Devices’ family of single-chip IEEE floating-point processors optimized for digital signal processing applications. Its architecture is similar to that of Analog Devices’ ADSP-2100 family of fixed-point DSP processors.Fabricated in a high-speed, low-power CMOS process, the ADSP-21020 has a 30 ns instruction cycle time. With a high-performance on-chip instruction cache, the ADSP-21020 can execute every instruction in a single cycle.The ADSP-21020 features:
•Independent Parallel Computation Units
   The arithmetic/logic unit (ALU), multiplier and shifter perform single-cycle instructions. The units are architecturally arranged in parallel, maximizing computational throughput. A single multifunction instruction executes parallel ALU andmultiplier operations. These computation units support IEEE 32-bit single-precision floating-point, extended precision 40-bit floating-point, and 32-bit fixed-point data formats.
•Data Register File
   A general-purpose data register file is used for transferring data between the computation units and the data buses, and for storing intermediate results. This 10-port (16-register) register file, combined with the ADSP-21020’s Harvard architecture, allows unconstrained data flow between computation units and off-chip memory.•Single-Cycle Fetch of Instruction and Two OperandsThe ADSP-21020 uses a modified Harvard architecture in which data memory stores data and program memory stores both instructions and data. Because of its separate program and data memory buses and on-chip instruction cache, the processor can simultaneously fetch an operand from data memory, an operand from program memory, and an instruction from the cache, all in a single cycle.
•Memory Interface
   Addressing of external memory devices by the ADSP-21020 is facilitated by on-chip decoding of high-order address lines to generate memory bank select signals. Separate control lines are also generated for simplified addressing of page-mode DRAM.The ADSP-21020 provides programmable memory wait states, and external memory acknowledge controls allow interfacing to peripheral devices with variable access times. 

    基于ADSP21020的以上特性，我们目前已经成功完成ADSP21020芯片解密，更多可解密DSP芯片解密型号不断更新中，有ADSP21020芯片解密等冷偏门疑难系列单片机解密、芯片解密需求者欢迎与龙芯世纪科技芯片解密服务中心联系咨询更多解密详情。

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