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Спецификация 30046-23 изготовлена ​​​​«National Semiconductor» и имеет функцию, называемую «Geode GXLV Processor Series Low Power Integrated x86 Solutions».

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Номер произв 30046-23
Описание Geode GXLV Processor Series Low Power Integrated x86 Solutions
Производители National Semiconductor
логотип National Semiconductor логотип 

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30046-23 Даташит, Описание, Даташиты
April 2000
Geode™ GXLV Processor Series
Low Power Integrated x86 Solutions
General Description
The National Semiconductor® Geode™ GXLV processor
series is a new line of integrated processors specifically
designed to power information appliances for entertain-
ment, education, and business. Serving the needs of con-
sumers and business professionals alike, it is the perfect
solution for information appliance applications such as
thin clients, interactive set top boxes, and personal inter-
net access devices.
The GXLV processor series is divided into three main cat-
egories as defined by the core operating voltage. Avail-
able with core voltages of 2.2V, 2.5V, and 2.9V, it offers
extremely low typical power consumption (1.0W to 2.5W)
leading to longer battery life and enabling small form-fac-
tor, fanless designs. Each core voltage is offered in fre-
quencies that are enabled by specific system clock and
multiplier settings. This allows the user to select the
device(s) that best fit their power and performance
requirements. This flexibility makes the GXLV processor
series ideally suited for applications where power con-
sumption and performance (speed) are equally important.
Typical power consumption is defined as an average,
measured running Microsoft’s Windows at 80% Active Idle
(Suspend-on-Halt) with a display resolution of 800x600x8
bpp at 75 Hz.
Internal Block Diagram
SYSCLK
Clock Module
SYSCLK
multiplied by
A
Core
Clocks
X-Bus
Clocks
16 KB
Unified L1
Cache
(128)
X86 Compatible Core
Integer
TLB Unit
Instruction
Fetch
MMU
Load/Store
INT/NMI
Interrupt
Control
FP_Error
Floating Point
Unit
INTR
IRQ13
SMI#
C-Bus (64)
SUSP#
SUSPA#
Power
Management
Control
Core Suspend
Core Acknowledge
X-Bus Suspend
X-Bus Acknowledge
X-Bus (32)
Arbiter
Write Buffers
X-Bus Controller
Read Buffers
PCI Host
Arbiter Controller
2D Accelerator
VGA
BLT Engine
ROP Unit
X-Bus Clk ÷ B
Display Controller
Compression Buffer
Palette RAM
Timing Generator
3
REQ/GNT
Pairs
PCI Bus
4
SDRAM
Clocks
64-bit SDRAM
RGB
YUV
Video Companion Interface
National Semiconductor is a registered trademark of National Semiconductor Corporation.
Geode and WebPAD are trademarks of National Semiconductor Corporation.
For a complete listing of National Semiconductor trademarks, please visit www.national.com/trademarks.
© 2000 National Semiconductor® Corporation
www.national.com









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30046-23 Даташит, Описание, Даташиты
While the x86 core provides maximum compatibility with
the vast amount of internet content available, the intelli-
gent integration of several other functions, such as mem-
ory controller and graphics, offer a true system-level
multimedia solution.
The GXLV processor core is a proven x86 design that
offers competitive performance. It contains integer and
floating point execution units based on sixth-generation
technology. The integer core contains a single, five-stage
execution pipeline and offers advanced features such as
operand forwarding, branch target buffers, and extensive
write buffering. Accesses to the 16 KB write-back L1
cache are dynamically reordered to eliminate pipeline
stalls when fetching operands.
In addition to the advanced CPU features, the GXLV pro-
cessor integrates a host of functions typically imple-
mented with external components. A full function graphics
accelerator contains a Video Graphics Array (VGA) con-
troller, bitBLT engine, and a Raster Operations (ROP) unit
for complete Graphical User Interface (GUI) acceleration
under most operating systems. A display controller con-
tains additional video buffering to enable >30 fps MPEG1
playback and video overlay when used with a National
Semiconductor I/O Companion chip such as the CS5530.
Graphics and system memory accesses are supported by
a tightly coupled SDRAM controller which eliminates the
need for an external L2 cache. A PCI host controller sup-
ports up to three bus masters for additional connectivity
and multimedia capabilities.
The GXLV processor also incorporates Virtual System
Architecture® (VSA™) technology. VSA technology
enables the XpressGRAPHICS and XpressAUDIO sub-
systems. Software handlers are available that provide full
compatibility for industry standard VGA and 16-bit audio
functions that are transparent at the operating system
level.
The GXLV processor is designed to be used with the
CS5530 I/O Companion, also supplied by National Semi-
conductor. Together they provide a scalable, flexible, low-
power, system-level solution well suited for a wide array of
information appliances ranging from hand-held personal
information access devices to digital set top boxes and
thin clients.
Features
General Features
 Packaging:
— 352-Terminal Ball Grid Array (BGA) or
— 320-Pin Staggered Pin Grid Array (SPGA)
 0.25-micron four layer metal CMOS process
 Split rail design:
— Available 2.2V, 2.5V, or 2.9V core
— 3.3V I/O interface (5V tolerant)
 Low typical power consumption:
— 1.0W @ 2.2V/166 MHz
— 2.5W @ 2.9V/266 MHz
Note:
Typical power consumption is defined as an aver-
age, measured running Windows at 80% Active
Idle (Suspend-on-Halt) with a display resolution of
800x600x8 bpp @ 75 Hz.
 Speeds offered up to 266 MHz
 Unified Memory Architecture:
— Frame buffer and video memory reside in main
memory
— Minimizes Printed Circuit Board (PCB) area require-
ments
— Reduces system cost
 Compatible with multiple Geode I/O companion
devices provided by National Semiconductor
32-Bit x86 Processor
 Supports Intel’s MMX instruction set extension for the
acceleration of multimedia applications
 16 KB unified L1 cache
 Five-stage pipelined integer unit
 Integrated Floating Point Unit (FPU)
 Memory Management Unit (MMU) adheres to standard
paging mechanisms and optimizes code fetch perfor-
mance:
— Load-store reordering gives priority to memory
reads
— Memory-read bypassing eliminates unnecessary or
redundant memory reads
 Re-entrant System Management Mode (SMM)
enhanced for VSA technology
 Fully Static Design
Flexible Power Management
 Supports a wide variety of standards:
— APM for Legacy power management
— ACPI for Windows power management
– Direct support for all standard processor (C0-C4)
states
— OnNOW specification compliant
 Supports a wide variety of hardware and software
controlled modes:
— Fully Active
— Active Idle (core stopped, display active)
— Standby (core and all integrated functions halted)
— Sleep (core and integrated functions halted and all
external clocks stopped)
— Suspend Modulation (automatic throttling of CPU
core)
– Programmable duty cycle for optimal perfor-
mance/thermal balancing
— Several dedicated and programmable wake-up
events (via Geode I/O companion chip)
www.national.com
2
Revision 1.1









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30046-23 Даташит, Описание, Даташиты
PCI Host Controller
 Several arbitration schemes supported
 Supports up to three PCI bus masters
 Synchronous to CPU core
 Allows external PCI master accesses to main memory
concurrent with CPU accesses to L1 cache
Virtual Systems Architecture Technology
 Innovative architecture allowing OS independent (soft-
ware) virtualization of hardware functions
 Provides XpressGRAPHICS subsystem:
— High performance legacy VGA core compatibility
Note: Uses 2D Graphics Accelerator.
 Provides 16-bit XpressAUDIO subsystem:
— 16-bit stereo FM synthesis
— OPL3 emulation
— Supports MPU-401 MIDI interface
— Hardware assist provided via Geode I/O companion
chip
 Additional hardware functions can be supported as
needed
2D Graphics Accelerator
 Accelerates BitBLTs, line draw, text
 Bresenham vector engine
 Supports all 256 ROPs
 Supports transparent BLTs and page flipping for
Microsoft’s DirectDraw
 Runs at core clock frequency
 Full VGA and VESA mode support
 Special "driver level” instructions utilize internal
scratchpad for enhanced performance
Display Controller
 Display Compression Technology (DCT) architecture
greatly reduces memory bandwidth consumption of
display refresh
 Supports a separate video buffer and data path to
enable video acceleration in Geode I/O companion
devices
 Internal palette RAM for gamma correction
 Direct interface to Geode I/O companion devices for
CRT and TFT flat panel support eliminates the need for
an external RAMDAC
 Hardware cursor
 Supports up to 1280x1024x8 bpp and
1024x768x16 bpp
XpressRAM Subsystem
 SDRAM interface tightly coupled to CPU core and
graphics subsystem for maximum efficiency
 64-Bit wide memory bus
 Support for:
— Two 168-pin unbuffered DIMMs
— Up to 16 simultaneously open banks
— 16-byte reads (burst length of two)
— Up to 256 MB total memory supported
Diverse Operating System Support
 Microsoft’s Windows 2000, 9X, NT, and CE
 Sun Microsystems’ Java
 WindRiver Systems’ VxWorks
 QNX Software Systems’ QNX
 Linux
Revision 1.1
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Номер в каталогеОписаниеПроизводители
30046-23Geode GXLV Processor Series Low Power Integrated x86 SolutionsNational Semiconductor
National Semiconductor

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