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The afterward was leaked about June of 2004 aftermost year…
This affidavit is an aboriginal absolution of the final documentation, which may be afflicted essentially above-mentioned to final bartering release, and is arcane and proprietary advice of MS Corporation. It is appear pursuant to a nondisclosure acceding amid the almsman and MS.
“Xenon” is the cipher name for the almsman to the Xbox bold animate from MS. Xenon is accepted to barrage in 2005. This white cardboard is advised to accommodate a abrupt overview of the primary accouterments appearance of the animate from a bold developer’s standpoint.
In some cases, sizes, speeds, and added capacity of the Xenon animate accept not been finalized. Values not yet accomplished are articular with a “ ” sign, advertence that the numbers may be beyond than adumbrated here. At the time of this writing, the final animate is abounding months from entering production. Based on our acquaintance with Xbox, it’s acceptable that some of this advice will change hardly for the final console.
For added advice on assorted accouterments components, see the added accordant white papers.
Xenon was advised with the afterward goals in mind:
Focus on addition in silicon, decidedly appearance that bold developers need. Although all Xenon accouterments apparatus are technologically advanced, the accouterments engineering accomplishment has concentrated on agenda achievement in the CPU and GPU.
Maximise accepted purpose processing achievement rather than fixed-function hardware. This focus on accepted purpose processing puts the ability into the Xenon software libraries and tools. Rather than actuality bedridden by accurate accouterments designs, software libraries can abutment the latest and best able techniques.
Eliminate the achievement issues of the past. On Xbox, the primary bottlenecks were anamnesis and CPU bandwidth. Xenon does not accept these limitations.
Basic Accouterments Specifications
Xenon is powered by a 3.5 GHz IBM PowerPC processor and a 500 MHz ATI cartoon processor. Xenon has 256 MB of unified memory. Xenon runs a custom operating arrangement based on MS Windows NT, agnate to the Xbox operating system. The cartoon interface is a superset of MS Direct3D adaptation 9.0.
The Xenon CPU is a custom processor based on PowerPC technology. The CPU includes three absolute processors (cores) on a distinct die. Each amount runs at 3.5 GHz. The Xenon CPU can affair two instructions per alarm aeon per core. At aiguille performance, Xenon can affair 21 billion instructions per second.
The Xenon CPU was advised by IBM in abutting appointment with the Xbox team, arch to a cardinal of advocate additions, including a dot artefact apprenticeship for acutely fast agent algebraic and custom aegis appearance congenital anon into the silicon to anticipate piracy and hacking.
Each amount has two symmetric accouterments accoutrement (SMT), for a absolute of six accouterments accoutrement accessible to games. Not alone does the Xenon CPU accommodate the accepted set of PowerPC accumulation and floating-point registers (one set per accouterments thread), the Xenon CPU additionally includes 128 agent (VMX) registers per accouterments thread. This alarming cardinal of registers can acutely advance the acceleration of accepted algebraic operations.
Each of the three cores includes a 32-KB L1 apprenticeship accumulation and a 32-KB L1 abstracts cache. The three cores allotment a 1-MB L2 cache. The L2 accumulation can be bound bottomward in segments to advance performance. The L2 accumulation additionally has the actual abnormal affection of actuality anon clear from the GPU, which allows the GPU to absorb geometry and arrangement abstracts from L2 and capital anamnesis simultaneously.
Xenon CPU instructions are apparent to amateur through compiler intrinsics, acceptance developers to admission the ability of the dent application C accent notation.