ALSTOM SDK-C0147 12004-101-00 SBS04M17C模塊卡件
1.產(chǎn) 品 資 料 介 紹：
中文資料：
在ALSTOM SDK-C0147 12004-101-00 SBS04M17C完全運(yùn)行之前，大多數(shù)DRAM設(shè)備需要一定數(shù)量的訪問(wèn)周期通常情況下，板載刷新電路和正常DRAM安裝可以滿足這一要求。然而，軟件應(yīng)確保對(duì)RAM的每個(gè)存儲(chǔ)體執(zhí)行至少10個(gè)初始化周期。ALSTOM SDK-C0147 12004-101-00 SBS04M17C有關(guān)詳細(xì)編程信息，請(qǐng)參閱《單板計(jì)算機(jī)程序員參考指南》中的MEMC040或MCECC。
DRAM編程注意事項(xiàng)? DRAM映射解碼器可以被編程以適應(yīng)不同的基本地址和夾層板的尺寸。? 板載DRAM被本地總線重置禁用，ALSTOM SDK-C0147 12004-101-00 SBS04M17C并且必須在訪問(wèn)DRAM之前進(jìn)行編程。? 在DRAM完全可操作之前，大多數(shù)DRAM設(shè)備需要一定數(shù)量的訪問(wèn)周期。ALSTOM SDK-C0147 12004-101-00 SBS04M17C
通常情況下，板載刷新電路和正常DRAM安裝可以滿足這一要求。然而，軟件應(yīng)確保每個(gè)RAM組至少執(zhí)行10個(gè)初始化周期ALSTOM SDK-C0147 12004-101-00 SBS04M17C
英文資料：
Most DRAM devices require some number of access cycles before the DRAMs are fully operational. – Normally this requirement is met by the onboard refresh circuitry and normal DRAM installation. However, software should insure a minimum of 10 initialization cycles are performed to each bank of RAM. Refer to the MEMC040 or the MCECC in the Single Board Computers Programmer's Reference Guide for detailed programming information.ALSTOM SDK-C0147 12004-101-00 SBS04M17C
DRAM Programming Considerations ? The DRAM map decoder can be programmed to accommodate different base address(es) and sizes of mezzanine boards. ALSTOM SDK-C0147 12004-101-00 SBS04M17COnboard DRAM is disabled by a local bus reset and must be programmed before the DRAM can be accessed. ? Most DRAM devices require some number of access cycles before the DRAMs are fully operational.ALSTOM SDK-C0147 12004-101-00 SBS04M17C
Normally this requirement is met by the onboard refresh circuitry and normal DRAM installation. However, software should insure a minimum of 10 initialization cycles are performed to each bank of RAMALSTOM SDK-C0147 12004-101-00 SBS04M17C
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