Document
Geode™ GX1 Processor Series Low Power Integrated x86 Solution
April 2000
Geode™ GX1 Processor Series Low Power Integrated x86 Solution
General Description
The National Semiconductor® Geode™ GX1 processor series is a line of integrated processors specifically designed to power information appliances for entertainment, education, and business. Serving the needs of consumers and business professionals alike, it’s the perfect www.DataSheet4U.com solution for IA (information appliance) applications such as thin clients, interactive set-top boxes, and personal internet access devices. The Geode GX1 processor series is divided into three main categories as defined by the core operating voltage. Available with core voltages of 2.0V, 1.8V, and 1.6V, it offers extremely low typical power consumption (1.2W, 1.0W, and 0.8W, respectively) leading to longer battery life and enabling small form-factor, fanless designs. Typical power consumption is defined as an average, measured running Microsoft Windows at 80% Active Idle (Suspend-on-Halt) with a display resolution of 800x600x8 bpp at 75 Hz.
Geode™ GX1 Processor Internal Block Diagram
Clock Module SYSCLK
SYSCLK multiplied by “A”
INTR Core Clocks X-Bus Clocks x86 Compatible Core INT/NMI TLB Integer Unit FP_Error Interrupt Control IRQ13 SMI#
Scratchpad
16 KB Unified L1 Cache
(128)
Instruction Fetch
MMU Load/Store Floating Point Unit
C-Bus (64)
SUSP#
Core Suspend
SUSPA#
Power Management Control
Core Acknowledge X-Bus Suspend X-Bus Acknowledge X-Bus (32) Arbiter X-Bus Controller
Write Buffers
Read Buffers
Arbiter
PCI Host Controller
2D Accelerator VGA BLT Engine ROP Unit
X-Bus CLK divide by “B”
Display Controller Compression Buffer Palette RAM Timing Generator
3 REQ/GNT Pairs
PCI Bus
4 SDRAM Clocks
64-bit SDRAM
RGB
YUV
Geode™ Graphics Companion Interface
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Geode™ I/O Companio
Geode™ GX1 Processor Series
While the x86 core provides maximum compatibility with the vast amount of Internet content available, the intelligent integration of several other functions, such as audio and graphics, offers a true system-level multimedia solution. The Geode GX1 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.
Features
General Features
Packaging: — 352-Terminal Ball Grid Array (BGA) or — 320-Pin Staggered Pin Grid Array (SPGA) 0.18-micron four layer metal CMOS process Split rail design: — Available 1.6V, 1.8V, or 2.0V core — 3.3V I/O interface Fully static design Low Typical Power Consumption: — 0.8W @ 1.6V/200 MHz — 1.2W @ 2.0V/300 MHz Typical power consumption is defined as an average, measured running Windows at 80% Active Idle (Suspend-on-Halt) with a display resolution of 800x600x8 bpp @ 75 Hz.
In addition to the advanced CPU features, the GX1 processor integrates a host of functions typically implemented with external components. A full function graphics accelerwww.DataSheet4U.com ator contains a VGA (video graphics array) controller, bitBLT engine, and a ROP (raster operations) unit for complete GUI (Graphical User Interface) acceleration under most operating systems. A display controller contains additional video buffering to enable >30 fps MPEG1 playback and video overlay when used with a National Semiconductor Geode I/O or graphics companion chip (e.g., CS5530 or CS9211). 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 supports up to three bus masters for additional connectivity and multimedia capabilities. The GX1 processor also incorporates Virtual System Architecture® (VSA™) technology. VSA technology enables the XpressGRAPHICS and XpressAUDIO subsystems. 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. Together the National Semiconductor I/O companion and GX1 processor Geode devices 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.
Note:
Speeds offered up to 300 MHz.