powerpc

Computing Dictionary

PowerPC definition

processor, standard
(PPC) A RISC microprocessor designed to meet a standard which was jointly designed by Motorola, IBM, and Apple Computer (the PowerPC Alliance). The PowerPC standard specifies a common instruction set architecture (ISA), allowing anyone to design and fabricate PowerPC processors, which will run the same code. The PowerPC architecture is based on the IBM POWER architecture, used in IBM's RS/6000 workstations. Currently IBM and Motorola are working on PowerPC chips.
The PowerPC standard specifies both 32-bit and 64-bit data paths. Early implementations were 32-bit (e.g. PowerPC 601); later higher-performance implementations were 64-bit (e.g. PowerPC 620). A PowerPC has 32 integer registers (32- or 64 bit) and 32 floating-point (IEEE standard 64 bit) floating-point registers.
The POWER CPU chip and PowerPC have a (large) common core, but both have instructions that the other doesn't. The PowerPC offers the following features that POWER does not:
Support for running in little-endian mode.
Addition of single precision floating-point operations.
Control of branch prediction direction.
A hardware coherency model (not in Book I).
Some other floating-point instructions (some optional).
The real time clock (upper and lower) was replaced with the time base registers (upper and lower), which don't count in sec/ns (the decrementer also changed).
64-bit instruction operands, registers, etc. (in 64 bit processors).
See also PowerOpen, PowerPC Platform (PReP).
IBM PPC info (http://fnctsrv0.chips.ibm.com/products/ppc/index.html).
(gopher://info.hed.apple.com/), "Apple Corporate News/" (press releases), "Apple Technologies/" and "Product Information/". (gopher://ike.engr.washington.edu/), "IBM General News/", "IBM Product Announcements/", "IBM Detailed Product Announcements/", "IBM Hardware Catalog/".
Usenet newsgroups: news:comp.sys.powerpc, news:comp.sys.mac.hardware.
["Microprocessor Report", 16 October 1991].
(1994-09-30)
The Free On-line Dictionary of Computing, © Denis Howe 2010 http://foldoc.org
Cite This Source
Explore Dictionary.com
Previous Definition: poweropen environment
Next Definition: powerpc 601
Words Near: powerpc
More from Thesaurus.com
Synonyms and Antonyms for powerpc
More from Reference.com
Search for articles containing powerpc
More from Dictionary.com Translator
Dictionary.com Word FAQs

Dictionary.com presents 366 FAQs, incorporating some of the frequently asked questions from the past with newer queries.

Copyright © 2014 Dictionary.com, LLC. All rights reserved.
  • Please Login or Sign Up to use the Recent Searches feature