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EM68C16CWQG-18IH 参数 Datasheet PDF下载

EM68C16CWQG-18IH图片预览
型号: EM68C16CWQG-18IH
PDF下载: 下载PDF文件 查看货源
内容描述: [64M x 16 bit DDRII Synchronous DRAM (SDRAM)]
分类和应用: 动态存储器双倍数据速率
文件页数/大小: 60 页 / 1276 K
品牌: ETRON [ ETRON TECHNOLOGY, INC. ]
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EtronTech  
EM68C16CWQG  
Off-chip drive (OCD) impedance adjustment  
DDR2 SDRAM supports driver calibration feature and the following flow chart is an example of sequence.Every  
calibration mode command should be followed by OCD calibration mode exitbefore any other command being  
issued.All MR should be programmed before entering OCD impedance adjustment and ODT (On Die Termination)  
should be carefully controlled depending on system environment.  
Figure 4. OCD impedance adjustment sequence  
Before entering OCD impedance adjustment, all MR should be programmed and  
ODT should be carefully controlled depending on system environment  
Start  
EMRS:OCD calibration mode exit  
EMRS:Drive(1)  
EMRS:Drive(0)  
DQ &DQS HIGH;DQS# LOW  
DQ &DQS LOW;DQS# HIGH  
ALL OK  
ALL OK  
Test  
Test  
EMRS:OCD calibration mode exit  
EMRS:Enter Adjust Mode  
EMRS:OCD calibration mode exit  
EMRS:Enter Adjust Mode  
BL=4 code input to all DQs  
Inc, Dec, or NOP  
BL=4 code input to all DQs  
Inc, Dec, or NOP  
EMRS:OCD calibration mode exit  
EMRS:OCD calibration mode exit  
EMRS:OCD calibration mode exit  
End  
Rev. 1.2  
13  
Apr. /2016