AMD-K6-2E/400AFR AMD [Advanced Micro Devices], AMD-K6-2E/400AFR Datasheet - Page 21

• Manufacturer Part Number: AMD-K6-2E/400AFR
• Manufacturer: AMD [Advanced Micro Devices]

Preliminary Information
AMD-K6™-2E Processor Data Sheet
22529B/0—January 2000
Microarchitecture
Th e A M D -K 6 -2 E p ro c e s s o r ’s R I S C 8 6 m i c ro a rch i t e c t u re i s a d e c o u p l e d
decode/execution superscalar design that implements state-of-the-art design
techniques to achieve leading-edge performance.
Advanced design techniques implemented in the AMD-K6-2E processor include
multiple x86 instruction decode, single-clock internal RISC operations, ten execution
units that support superscalar operation, out-of-order execution, data forwarding,
speculative execution, and register renaming.
In addition, the processor supports advanced branch prediction logic by
implementing an 8192-entry branch history table, a branch target cache, and a return
address stack, which combine to deliver better than a 95% prediction rate. These
design techniques enable the AMD-K6-2E to issue, execute, and retire multiple x86
instructions per clock, resulting in excellent scalable performance. The
microarchitecture of the AMD-K6-2E processor is more completely described in
“Internal Architecture” on page 7.
3DNow!™ Technology
AMD’s 3DNow! technology is an instruction-set extension to x86, which includes 21
new instructions to accelerate 3D graphics and other single-precision floating-point
compute intensive operations.
Improvements include fast frame rates on high-resolution graphics applications,
superior modeling of real-world environments and physics, life-like images, graphics,
and audio.
AMD has already shipped millions of processors with 3DNow! technology for desktop
and notebook PCs, revolutionizing the 3D experience with up to four times the peak
floating-point performance of previous sixth generation solutions. AMD is now
bringing this advanced capability to embedded systems.
AMD has taken a leadership role in developing these new instructions that enable
exciting new levels of performance and realism. 3DNow! technology was defined and
implemented in collaboration with Microsoft, application developers, and graphics
vendors, and has received an enthusiastic reception. It is compatible with today’s
existing x86 software, is supported by industry-standard APIs, and requires no
operating system support, thereby enabling a broad class of applications to benefit
from 3DNow! technology.
Industry-Standard x86 Architecture
The AMD-K6-2E processor is x86 binary code compatible. AMD’s extensive
experience through six generations of x86 processors has been carefully integrated
into the processor to enable compatibility with Windows®-based operating systems,
including Windows 95, Windows 98, Windows CE, Windows NT®, and Windows NTE.
Chapter 1
AMD-K6™-2E Processor
3