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- Microcode abstract "Microcode is a layer of hardware-level instructions or data structures involved in the implementation of higher level machine code instructions in central processing units, and in the implementation of the internal logic of many channel controllers, disk controllers, network interface controllers, network processors, graphics processing units, and other hardware. It resides in special high-speed memory and translates machine instructions into sequences of detailed circuit-level operations. It helps separate the machine instructions from the underlying electronics so that instructions can be designed and altered more freely. It also makes it feasible to build complex multi-step instructions while still reducing the complexity of the electronic circuitry compared to other methods. Writing microcode is often called microprogramming and the microcode in a particular processor implementation is sometimes called a microprogram.Modern microcode is normally written by an engineer during the processor design phase and stored in a ROM (read-only memory) or PLA (programmable logic array) structure,or a combination of both.However, machines also exist which have some (or all) microcode stored in SRAM or flash memory. This is traditionally denoted a "writeable control store" in the context of computers. Complex digital processors may also employ more than one (possibly microcode based) control unit in order to delegate sub-tasks which must be performed (more or less) asynchronously in parallel. Microcode is generally not visible or changeable by a normal programmer, not even by an assembly programmer. Unlike machine code which often retains some compatibility among different processors in a family, microcode only runs on the exact electronic circuitry for which it is designed, as it constitutes an inherent part of the particular processor design itself.More extensive microcoding has also been used to allow small and simple microarchitectures to emulate more powerful architectures with wider word length, more execution units and so on; a relatively simple way to achieve software compatibility between different products in a processor family.Some hardware vendors, especially IBM, use the term as a synonym for firmware, so that all code in a device, whether microcode or machine code, is termed microcode (such as in a hard drive for instance, which typically contains both).".
- Microcode wikiPageExternalLink wiki?WritableInstructionSetComputer.
- Microcode wikiPageExternalLink MAHC.1986.10035.
- Microcode wikiPageExternalLink MAHC.1988.10039.
- Microcode wikiPageExternalLink 758c1e6a8a3e5d0285256bfa00685a2f?OpenDocument.
- Microcode wikiPageExternalLink uprog.html.
- Microcode wikiPageExternalLink csp0174.htm.
- Microcode wikiPageExternalLink attic3_016.html.
- Microcode wikiPageExternalLink uprog.html.
- Microcode wikiPageExternalLink index_eng.php.
- Microcode wikiPageExternalLink ibmrd1002F.pdf.
- Microcode wikiPageExternalLink msg00126.html.
- Microcode wikiPageID "19999".
- Microcode wikiPageRevisionID "603110467".
- Microcode hasPhotoCollection Microcode.
- Microcode subject Category:Central_processing_unit.
- Microcode subject Category:Firmware.
- Microcode subject Category:Instruction_processing.
- Microcode comment "Microcode is a layer of hardware-level instructions or data structures involved in the implementation of higher level machine code instructions in central processing units, and in the implementation of the internal logic of many channel controllers, disk controllers, network interface controllers, network processors, graphics processing units, and other hardware. It resides in special high-speed memory and translates machine instructions into sequences of detailed circuit-level operations.".
- Microcode label "Microcode".
- Microcode label "Microcode".
- Microcode label "Microcódigo".
- Microcode label "Microprogrammation".
- Microcode label "Microprogrammazione".
- Microcode label "Mikrocode".
- Microcode label "Mikroprogram".
- Microcode label "Микрокод".
- Microcode label "マイクロプログラム方式".
- Microcode label "微程序".
- Microcode sameAs Mikrocode.
- Microcode sameAs Microcódigo.
- Microcode sameAs Microprogrammation.
- Microcode sameAs Microprogrammazione.
- Microcode sameAs マイクロプログラム方式.
- Microcode sameAs 마이크로코드.
- Microcode sameAs Microcode.
- Microcode sameAs Mikroprogram.
- Microcode sameAs m.050sg.
- Microcode sameAs Q175869.
- Microcode sameAs Q175869.
- Microcode wasDerivedFrom Microcode?oldid=603110467.
- Microcode isPrimaryTopicOf Microcode.