Geode GXLV Processor Series Low Power Integrated x86 Solutions

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Geode GXLV Processor SeriesIntegrated Functions (Continued)SDRAM Refresh CycleFigure 4-7 shows a SDRAM auto refresh cycle. The memorycontroller always precedes the refresh cycle with aPRE command to all banks.SDCLKCS#RAS#Page MissFigure 4-8 shows a Read/WRT command after a pagemiss cycle. In order to program the new row address, aPRE command must be issued followed by an ACT command.CAS#WE#MA[10]Figure 4-7. Auto Refresh CycleSDCLKCOMMANDPRE NOP NOP ACT NOP NOP R/W NOPtRPtRCDADDRESSBAROWCOLFigure 4-8. Read/WRT Command to a New Row Addresswww.national.com 122 Revision 1.3
Integrated Functions (Continued)4.3.7 SDRAM Interface ClockingTheGXLVprocessordrivestheSDCLKtotheSDRAMs;one for each DIMM bank. All the control, data, andaddress signals driven by the memory controller are sampledby the SDRAM at the rising edge of SDCLK. SDCLK-OUT is a reference signal used to generate SDCLKIN.Read data is sampled by the memory controller at the risingedge of SDCLKIN.SDCLK[3:0]The delay for SDCLKIN from SDCLKOUT must bedesigned so that it lags the SDCLKs at the DRAM byapproximately 1 ns (check application notes for additionalinformation). The delay should also include the SDCLKtransmission line delay. All four SDCLK traces on theboard should be the same length, so there is no skewbetween them. These guidelines allow the memory interfaceto operate at a higher performance.SDCLK0SDCLK1DIMM0Geode GXLV Processor SeriesSDCLKOUTSDCLK2Geode GXLVProcessorDelaySDCLK3DIMM1SDCLKINFigure 4-9. SDCLKIN ClockingRevision 1.3 123 www.national.com
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Geode GXLV Processor SeriesTable of
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Geode GXLV Processor SeriesArchitec
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Architecture Overview (Continued)Ge
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Architecture Overview (Continued)SD
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2.0 Signal DefinitionsThis section
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Signal Definitions (Continued)PinNo
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Signal Definitions (Continued)PinNo
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3.0 Processor ProgrammingThis secti
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Integrated Functions (Continued)4.7
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Integrated Functions (Continued)4.7
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Power Management (Continued)CPU Sus
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Power Management (Continued)Table 5
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Electrical Specifications (Continue
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Instruction Set (Continued)Table 7-
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Instruction Set (Continued)7.5 MMX
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Geode GXLV Processor Series Low Pow
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Geode GXLV Processor Series Low Power Integrated x86 Solutions

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