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之前介紹的大部分規(guī)則都適合于在PCB上含有一個(gè)或更多的DIMM，例外的是在DIMM里所要考慮到去耦因素同在DIMM組里有所區(qū)別。
在DIMM組里，對(duì)于ADDR/CMD/CNTRL所采用的拓?fù)浣Y(jié)構(gòu)里，帶有少的短線菊花鏈拓?fù)浣Y(jié)構(gòu)和樹(shù)形拓?fù)浣Y(jié)構(gòu)是適用的。
10
案例
上面所介紹的相關(guān)規(guī)則，在DDR2 PCB、DDR3 PCB和DDR3-DIMM PCB里，都已經(jīng)得到普遍的應(yīng)用。
在下面的案例中，我們采用MOSAID公司的控制器，它提供了對(duì)DDR2和DDR3的操作功能。在SI仿真方面，采用了 IBIS模型，其存儲(chǔ)器的模型來(lái)自MICRON Technolgy，Inc。
對(duì)于DDR3 SDRAM的模型提供1333 Mbps的速率。在這里，數(shù)據(jù)是操作是在1600 Mbps下的。對(duì)于不帶緩存（unbuffered DIMM（MT_DDR3_0542cc）EBD模型是來(lái)自Micron Technology，下面所有的波形都是采用通常的測(cè)試方法，且是在SDRAM die級(jí)進(jìn)行計(jì)算和仿真的。
圖2所示的6層板里，只在TOP和BOTTOM層進(jìn)行了布線，存儲(chǔ)器由兩片的SDRAM以菊花鏈的方式所構(gòu)成。而在DIMM的案例里，只有一個(gè)不帶緩存的DIMM被使用。圖9-11是對(duì)TOP/BOTTOM層布線的一個(gè)閃照?qǐng)D和信號(hào)完整性仿真圖。
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