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  GXM - Geode Processor Integrated x86 Solution with MMX Support

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Datasheet Knowledge Base

Features
 
General Features
Packaged in:
352-Terminal Ball Grid Array (BGA) or
320-Pin Staggered Pin Grid Array (SPGA)
0.35-micron four layer metal CMOS process
Split rail design (3.3V I/O and 2.9V core)
 
32-Bit x86 Processor
Supports the MMX instruction set extension for the acceleration of multimedia applications
Speeds offered up to 266 MHz
16 KB unified L1 cache
Integrated Floating Point Unit (FPU)
Re-entrant System Management Mode (SMM) enhanced for VSA
 
PCI Controller
Fixed, rotating, hybrid, or ping-pong arbitration
Supports up to three PCI bus masters
Synchronous CPU and PCI bus clock frequency
Supports concurrency between PCI master and L1 cache
 
Power Management
Designed to support CS5530 power management architecture
CPU only Suspend or full 3V Suspend supported:
Clocks to CPU core stopped for CPU Suspend
All on-chip clocks stopped for 3V Suspend
Suspend refresh supported for 3V Suspend
 
Virtual Systems Architecture Technology
Architecture allows OS independent (software) virtualization of hardware functions
Provides compatible high performance legacy VGA core functionality
 
Note: GUI (Graphical User Interface) graphics acceleration is pure hardware.
Provides 16-bit XpressAUDIO subsystem
 
2D Graphics Accelerator
Graphics pipeline performance significantly increased over previous generations by pipelining burst reads/writes
Accelerates BitBLTs, line draw, text
Supports all 256 raster operations
Supports transparent BLTs
Runs at core clock frequency
Full VGA and VESA mode support
Special "Driver level� instructions utilize internal scratchpad for enhanced performance
 
Display Controller
Video Generator (VG) improves memory efficiency for display refresh with SDRAM
Supports a separate MPEG1 video buffer and data path to enable video acceleration in the CS5530
Internal palette RAM for use with the CS5530
Direct interface to CS5530 for CRT and TFT flat panel support which eliminates need for external RAMDAC
Hardware frame buffer compressor/decompressor
Hardware cursor
Supports up to 1280x1024x8 bpp and 1024x768x16 bpp
 
XpressRAM Subsystem
Memory control/interface directly from CPU
64-Bit wide memory bus
Support for:
Two 168-pin unbuffered DIMMs
Up to 16 open banks simultaneously
Single or 16-byte reads (burst length of two)

  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.

The GXm processor core is a proven design that offers competitive CPU performance. More...

Typical Application
See Datasheet for Application Information


Datasheet


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Geode GXm Processor Integrated x86 Solution with MMX Support 4496 Kbytes 12-Apr-00 View Online Download Receive via Email

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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.

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.

In addition to the advanced CPU features, the GXm processor integrates a host of functions which are typically implemented with external components. A full-function graphics accelerator provides pixel processing and rendering 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 includes Virtual System Architecture® (VSA™ technology) enabling XpressGRAPHICS and XpressAUDIO subsystems as well as generic emulation capabilities. Software handler routines for the XpressGRAPHICS and XpressAUDIO subsystems can be included in the BIOS and provide compatible VGA and 16-bit industry standard audio emulation. XpressAUDIO technology eliminates much of the hardware traditionally associated with audio functions.

[Information as of 11-Oct-2007]