meaning of powerpc

1. PowerPC 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 IBMs 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 doesnt. 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 dont 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].

Related Words

powerpc | powerpc 601 | powerpc g3 | powerpc platform | powerpc reference platform |

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