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G1-200B-85-1.6 Folha de dados(PDF) 2 Page - National Semiconductor (TI) |
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G1-200B-85-1.6 Folha de dados(HTML) 2 Page - National Semiconductor (TI) |
2 / 247 page www.national.com 2 Revision 1.0 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. In addition to the advanced CPU features, the GX1 proces- sor integrates a host of functions typically implemented with external components. A full function graphics acceler- ator contains a VGA (video graphics array) controller, bit- BLT engine, and a ROP (raster operations) unit for complete GUI (Graphical User Interface) 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 Geode I/O or graphics companion chip (e.g., CS5530 or CS9211). Graphics and system memory accesses are supported by a tightly coupled SDRAM con- troller 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 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. 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. 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 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 300 MHz Unified Memory Architecture — Frame buffer and video memory reside in main memory — Minimizes PCB (Printed Circuit Board) 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 Six-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 |
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