AMD-K6-2ESLASH233AMZ datasheet(26/332 Pages) AMD

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Internal Architecture

Chapter 2

AMD-K6™-2E Processor Data Sheet

22529B/0—January 2000

Preliminary Information

Enhanced RISC86®

Microarchitecture

Th e En hanced RISC86 m i croarchitecture d e fi nes the

characteristics of the AMD-K6-2E processor. The innovative

RISC86 microarchitecture approach implements the x86

instruction set by internally translating x86 instructions into

RISC86 operations. These RISC86 operations were specially

designed to include direct support for the x86 instruction set

while observing the RISC performance principles of fixed

length encoding, regularized instruction fields, and a large

Th e E n hanced RISC 86 mi c roa rchitecture used in the

A M D-K6 -2 E pro c es s o r en a b l e s hi gh er proc e s s o r co re

performance and promotes straightforward extensibility in

future designs. Instead of directly executing complex x86

instruct ions, w h ich have lengths of 1 to 15 by tes, the

AMD-K 6-2E processor executes the simpler and easier

fixed-length RISC86 opcodes, while maintaining the instruction

coding efficiencies found in x86 programs.

The AMD-K6-2E processor contains parallel decoders, a

centralized RISC86 operation scheduler, and ten execution

units that support superscalar operation—multiple decode,

execution, and retirement—of x86 instructions. These elements

are packed into an aggressive and highly efficient six-stage

pipeline.

AMD-K6™-2E

Processor Block

Diagram

As shown in Figure 1 on page 9, the high-performance,

out-of-order execution engine of the AMD-K6-2E processor is

mated to a split level-one 64-Kbyte writeback cache with 32

Kbytes of instruction cache and 32 Kbytes of data cache. The

instruction cache feeds the decoders and, in turn, the decoders

feed the scheduler. The Instruction Control Unit (ICU) issues

and retires RISC86 operations contained in the scheduler. The

system bus interface is an industry-standard 64-bit Super7 and

Socket 7 demultiplexed bus.

The AMD-K6-2E processor combines the latest in processor

microarchitecture to provide the highest x86 performance for

today’s computational systems. The AMD-K6-2E offers true

sixth-generation performance and x86 binary software

compatibility.

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