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Microcode

In computer architecture, microcode is a layer of low-level control data or instructions used to implement a processor's instruction set architecture or internal control sequences. It consists of hardware-level operations that carry out higher-level machine code instructions or direct internal sequencing in many digital components. In many modern Intel…

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Overview

Justification

History

Examples

Implementation

Writable control store

Comparison to VLIW and RISC

Micro-operations

Alternate meanings of "microcode"

Advanced semantic analysis

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Map overview Semantic statistics

Microcode

Nodes222
Edges221
Triples246
Avg. degree1.99
Density0.009009
Components1

How this topic connects Entity context

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Microcode

Top relations

related to Further reading · 43
Microcode → Annals, April, Bibcode, Brief History, Cambridge Philosophical Society, Computer Architecture, Computing, Control Circuits, December, Design, Electronic Digital Computer, Historical Overview, History, How, Husson, IBM Systems Journal, ISBN, Ken, MAHC, Mark
related to Examples · 42
Microcode → After, Another CROS, Burroughs, Capacitor Read-Only Storage, Charles Babbage, COBOL, CROS, E-unit, Eclipse MV/8000, Fortran, I-unit, I/O, IBM System/360, KL10, KS10 PDP-10, Many, Most, Most Data General Eclipse, New Machine, PDP-11
related to Writable control store · 17
Microcode → Burroughs Small Systems, Data General Eclipse MV/8000, DEC PDP-10, DEC VAX, G-machines, IBM System/360, In, Many, Nautilus, RAM, ROM, Such, Symbolics, System/370, WCS, WISC, Xerox
related to Moving up the line · 13
Microcode → Among, But, By, CPU, Early, However, Intel, ISAs, PDP-11, ROM, The, VAX, Zilog Z80
related to Vertical microcode · 13
Microcode → Alpha, ALU, Architecture, CMOS, Consequently, CPU, DEC Alpha, IBM, In, PALcode, Some, System/390, This
related to The 360 · 12
Microcode → ALU, But, For, FPU, IBM, ISA, ROM, System/360, The, These, This, Using
related to RISC enters · 11
Microcode → As, IBM, Imposing, ISA, John Cocke, System/370, The, They, This, Using, While
related to Benefits · 10
Microcode → ALU, IBM, In, Model, System/360, System/360 Model, The, The IBM System/360, The Model, This
related to Implementation · 10
Microcode → An, An I-unit, AND, CPU, E-unit, Each, It, Often, The, To
related to Design · 8
Microcode → CPU, Engineers, However, In, PLA, ROM, SRAM, This

Important terminology Word statistics

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Important terminology

instructions control instruction memory used machine store system hardware cpu complex processor ibm logic data one design using computer architecture

Entity relationships Subject–Predicate–Object triples

SubjectPredicateObjectConfidenceSrc
Microcodeis alayer of low-level control data or instructions used to implement a processor's instruction set architecture or internal control sequences0.90text
addition or comparing two numbersinstance ofwhich performs instructions0.80text
circuits for readinginstance ofwhich performs instructions0.80text
writing data to external memoryinstance ofwhich performs instructions0.80text
and small areas of onboard memory to store these values while they are being processedinstance ofwhich performs instructions0.80text
PL/I is entirelyinstance ofin which each statement of a high-level language0.80text
directly executed by microcodeinstance ofin which each statement of a high-level language0.80text
without compilationinstance ofin which each statement of a high-level language0.80text
memory block transferinstance ofCPU speeds grew more quickly than memory speeds and numerous techniques0.80text
memory pre-fetchinstance ofCPU speeds grew more quickly than memory speeds and numerous techniques0.80text
multi-level caches were used to alleviate thisinstance ofCPU speeds grew more quickly than memory speeds and numerous techniques0.80text
translation lookaside bufferinstance ofused PALcode to implement features0.80text

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    Min side: 3
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