Geode GXLV Processor Series Low Power Integrated x86 Solutions

Geode GXLV Processor Series1.0 Architecture OverviewThe Geode GXLV processor series represents the sixthgeneration of x86-compatible 32-bit processors with sixthgenerationfeatures. The decoupled load/store unit allowsreordering of load/store traffic to achieve higher performance.Other features include single-cycle execution, single-cycleinstruction decode, 16 KB write-back cache, andclock rates up to 266 MHz. These features are made possibleby the use of advanced-process technologies andpipelining.The GXLV processor has low power consumption at allclock frequencies. Where additional power savings arerequired, designers can make use of Suspend Mode, StopClock capability, and System Management Mode (SMM).The GXLV processor is divided into major functionalblocks (as shown in Figure 1-1):• Integer Unit• Floating Point Unit (FPU)• Write-Back Cache Unit• Memory Management Unit (MMU)• Internal Bus Interface Unit• Integrated FunctionsInstructions are executed in the integer unit and in thefloating point unit. The cache unit stores the most recentlyused data and instructions and provides fast access tothis information for the integer and floating point units.Write-BackCache UnitMMUIntegerUnitFPUC-BusInternal Bus Interface UnitX-BusIntegratedFunctionsGraphics Memory Display PCIPipeline Controller Controller ControllerSDRAM Port CS5530 PCI Bus(CRT/LCD TFT)Figure 1-1. Internal Block Diagramwww.national.com 10 Revision 1.3