This allows constant data, such as text strings or function tables, to be accessed without first having to be copied into data memory, preserving scarce (and power-hungry) data memory for read/write variables. Therefore, it is impossible for program contents to be modified by the program itself. If, for instance, every instruction run in the CPU requires an access to memory, the computer gains nothing for increased CPU speeda problem referred to as being memory bound. Harvard architecture is used as the CPU accesses the cache. external design 3 Modern uses of the Harvard architecture 4 References 5 External links . Digital signal processors (DSPs) generally execute small, highly optimized audio or video processing algorithms. References. Typically, code (or program) memory is read-only and data memory is read-write.
While the CPU executes from cache, it acts as a pure Harvard machine. This article needs additional citations for verification. All rights reserved.. Even in these cases, it is common to employ special instructions in order to access program memory as though it were data for read-only tables, or for reprogramming; those processors are modified Harvard architecture processors. Internal vs. Instruction address zero might identify a twenty-four bit value, while data address zero might indicate an eight-bit byte that is not part of that twenty-four bit value. Products Download Events Support All Product Families ARM7, ARM9, and Cortex-M3 Products C16x, XC16x, and ST10 Products C251 and 80C251 Products Cx51 and 8051 Products Modified Anytime In the Last 7 Days In the Last 14 Days In the Last 30 Days In the Last 90 Days In the Last 6 Months . 403 Forbidden.. In some systems, instructions can be stored in read-only memory while data memory generally requires read-write memory. (March 2011) (Learn how and when to remove this template message) .
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