<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)
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.
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: comp.sys.powerpc, comp.sys.mac.hardware.
["Microprocessor Report", 16 October 1991].
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