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30050-33

更新时间： 2022-11-25 18:04:54

品牌	Logo	应用领域
美国国家半导体 - NSC		/
页数	文件大小	规格书
244页	4221K
描述
Geode⑩ GXm Processor Integrated x86 Solution with MMX Support

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April 2000

Geode™ GXm Processor

Integrated x86 Solution with MMX Support

General Description

The National Semiconductor^®Geode™ GXm processor

is an advanced 32-bit x86 compatible processor offering

high performance, fully accelerated 2D graphics, a 64-bit

synchronous DRAM controller and a PCI bus controller,

all on a single chip that is compatible with Intel’s MMX

technology.

graphics accelerator provides pixel processing and ren-

dering functions.

A separate on-chip video buffer enables >30 fps MPEG1

video playback when used together with the CS5530 I/O

companion chip. Graphics and system memory accesses

are supported by a tightly-coupled synchronous DRAM

(SDRAM) memory controller. This tightly coupled memory

subsystem eliminates the need for an external L2 cache.

The GXm processor core is a proven design that offers

competitive CPU performance. It has integer and floating

point execution units that are based on sixth-generation

technology. The integer core contains a single, six-stage

execution pipeline and offers advanced features such as

operand forwarding, branch target buffers, and extensive

write buffering. A 16 KB write-back L1 cache is accessed

in a unique fashion that eliminates pipeline stalls to fetch

operands that hit in the cache.

The GXm processor includes Virtual System Architec-

ture^®(VSA™ technology) enabling XpressGRAPHICS

and XpressAUDIO subsystems as well as generic emula-

tion capabilities. Software handler routines for the Xpress-

GRAPHICS and XpressAUDIO subsystems can be

included in the BIOS and provide compatible VGA and 16-

bit industry standard audio emulation. XpressAUDIO tech-

nology eliminates much of the hardware traditionally asso-

ciated with audio functions.

In addition to the advanced CPU features, the GXm pro-

cessor integrates a host of functions which are typically

implemented with external components. A full-function

Geode™ GXm Processor Internal Block Diagram

Write-Back

Cache Unit

Integer

Unit

FPU

MMU

C-Bus

Internal Bus Interface Unit

X-Bus

Graphics

Pipeline

Memory

Controller

Display

Controller

PCI

Controller

Integrated

Functions

PCI Bus

SDRAM Port

CS5530

(CRT/LCD TFT)

National Semiconductor and Virtual System Architecture are registered trademarks of National Semiconductor Corporation.

Geode and VSA are trademarks of National Semiconductor Corporation.

For a complete listing of National Semiconductor trademarks, please visit www.national.com/trademarks.

www.national.com

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