胎盘屏障
在仿真之前，需要相应的IBIS模型文件，并把它转换为Cadence需要的DML文件，现在已经下载了一个IBIS 文件，它是Altera公司的cyclone3的IBIS文件：cyclone3.ibs。为了把它转化，我们首先需要打开Model Integrity打开Model Integrity后，
网络守护神
选择File Open 打开需要转化的IBIS文件
打开后如下图：
点击cyclon3，然后点右键，选择IBIS to DML，来实现IBIS到DML的转化
在转化时报错：
查看LOG File有如下说明：
这个时候实际上是出了很多报错，报错的说明如下：
WARNING: CYCLONE3_sstl18c1_cio_d10s Ramp value for maximum of Fall is significantly different with that computed from the corresponding TV curve - fixed
ERROR: TVCurve start time of CYCLONE3_ttl18_rdio_d8s RisingWaveform rise_1 at line 483255 is not same as CYCLONE3_ttl18_rdio_d8s FallingWaveform fall_1 at line 482667
ERROR: TVCurve start time of CYCLONE3_ttl18_rdio_d8s RisingWaveform rise_2 at line 483368 is not same as CYCLONE3_ttl18_rdio_d8s FallingWaveform fall_2 at line 482778
WARNING: CYCLONE3_sstl2c1_cio_d12s Ramp value for typical of Fall is significantly different with that computed from the corresponding TV curve - fixed
价值工程
WARNING: CYCLONE3_sstl2c1_rio_d12s Ramp value for typical of Fall is significantly different with that computed from the corresponding TV curve - fixed
WARNING: CYCLONE3_ttl18_rdio_d10s Ramp value for maximum of Rise is significantly different with that computed from the corresponding TV curve - fixed
Translation failed due to DMLCHECK errors.
Output saved as D:\yanshi\2\
Run ibis2signoise -d, a DML will be generated.
中国人的焦虑从哪里来Examine it with line numbers from the log message.
对于这个错误，说明是在DOS环境下运行ibis2signoise -d，可以了，那么就在DOS下运行 邓福德运行结束后，在运行目录下可以看到已经生成了文件：cyclone3.ibs.dml，修改它为cyclone3.dml
摆度DML文件已经生成，关闭Model Integrity
下一步就是要进行仿真了，
首先打开PCB SI
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