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Definition
The Crusoe processor solutions consist of a hardware engine logically surrounded
by a software layer. The engine is a very long instruction word (VLIW) CPU capable
of executing up to four operations in each clock cycle. The VLIW's native instruction
set bears no resemblance to the x86 instruction set; it has been designed purely
for fast lowpower
implementation using conventional CMOS fabrication. The
surrounding software layer gives x86 programs the impression that they are running
on x86 hardware. The software layer is called Code Morphing software because it
dynamically "morphs" x86 instructions into VLIW instructions. The Code
Morphing software includes a number of
advanced features to achieve good system-level
performance. Code Morphing support facilities are also built into the underlying
CPUs. In other words, the Transmeta designers have judiciously rendered some functions
in hardware and some in software, according to the product design goals and constraints.
Transmeta's Code Morphing technology changes the entire approach to designing
microprocessors. By demonstrating that practical microprocessors can be implemented
as hardware-software hybrids, Transmeta has dramatically expanded the design space
that microprocessor designers can explore for optimum solutions. Upgrades to the
software portion of a microprocessor can be rolled out independently from the
chip. Finally, decoupling the hardware design from the system and application
software that use it frees hardware designers to evolve and eventually replace
their designs without perturbing legacy software.
Crusoe processor
Mobile computing
has been the buzzword for quite a long time.Mobile computing devices like laptops,webslates
& notebook PCs are becoming common nowadays.The heart of every PC whether
a desktop or mobile PC is the microprocessor.Several microprocessors are available
in the market for desktop PCs from companies like Intel ,
AMD , Cyrix etc.The
mobile computing market has never had a microprocesor specifically designed for
it.The microprocessors used in mobile PCs are optimized versions of the desktop
PC microprocessor.
The concept
of Crusoe is well understood from the simple sketch of the proceesor architecture
, called 'amoeba'.In this concept , the x86 architecture is an ill-defined amoeba
containing features like segmentation, ASCII arithmetic ,variable-length instructions
etc. The amoeba explained how a traditional microprocessor was, in their design,
to be divided up into hardware and software.Thus Crusoe was conceptualised as
a hybrid microprocessor , that is it has a software part and a hardware part with
the software layer surrounding the hardware unit.The role of software is to act
as an emulator to translate x86 binaries into native code at run time. Crusoe
is a 128-bit microprocessor fabricated using the CMOS process.
The chip's design
is based on a technique called VLIW to ensure design simplicity and high performance.Besides
this it also uses Transmeta's two pateneted technologies , namely , Code Morphing
Software and LongRun Power Management.It is a highly integrated processor available
in different vesions for different market segments.
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