powerpc 音标拼音: [p'ɑʊɚp'is'i]
n . 由
IBM 公司与
Motorola 公司推出一种
RISC 微处理器
由
IBM 公司与
Motorola 公司推出一种
RISC 微处理器
(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 )
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