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30030-23 Scheda tecnica(PDF) 1 Page - National Semiconductor (TI) |
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30030-23 Scheda tecnica(HTML) 1 Page - National Semiconductor (TI) |
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1 / 244 page  © 2000 National Semiconductor Corporation www.national.com 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. 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 pro- cessor integrates a host of functions which are typically implemented with external components. A full-function 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 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. Geode™ GXm Processor Internal Block Diagram Write-Back Unit FPU Internal Bus Interface Unit Graphics Memory Display PCI SDRAM Port CS5530 PCI Bus Integer Cache Unit Integrated Functions MMU (CRT/LCD TFT) X-Bus Pipeline Controller Controller Controller C-Bus 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. |
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