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<title>2.4 Using the stemi -chip option</title>
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<h2>
<a name="1206190"> </a><font color="#003366" face="Verdana, Arial, Helvetica, sans-serif">2.4 Using the stemi -chip option</font>
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<p>
<a name="1206191"> </a><font size=2 face="Verdana, Arial, Helvetica, sans-serif">Each ST chip has a number of attributes, one of which is the EMI part it uses. The option <font size=2 face=Courier><strong>chip</strong></font> is useful to design for a specific chip type, using the default attributes available for the type. Some attributes are not available for certain chips. It is recommended that <strong>stemi</strong> is always used with the <font size=2 face=Courier><strong>-chip</strong></font> option. The <font size=2 face=Courier><strong>-chip</strong></font> option may also take the values <font size=2 face=Courier><strong>EMI2</strong></font>, <font size=2 face=Courier><strong>EMI3</strong></font> and <font size=2 face=Courier><strong>EMI4</strong></font>. These values specify an ST EMI part rather than a chip and may be used when the more specific chip attributes are not required. Using the <font size=2 face=Courier><strong>chip</strong></font> option and specifying a chip requires extra range checks to be performed by <strong>stemi</strong>. These checks may result in warning or error messages about invalid option selections and inputs.</font>
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<a name="1206192"> </a><font size=2 face="Verdana, Arial, Helvetica, sans-serif">Supported <font size=2 face=Courier><strong>-chip</strong></font> options are:</font>
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<p> <font size=2 face="Verdana, Arial, Helvetica, sans-serif"><li ><a name="1206193"> </a><font size=2 face=Courier><strong>5508</strong></font> - selects STi5508 chip attributes which include an EMI3,</font></p>
<p> <font size=2 face="Verdana, Arial, Helvetica, sans-serif"><li ><a name="1206194"> </a><font size=2 face=Courier><strong>5510</strong></font> - selects STi5510 chip attributes which include an EMI2,</font></p>
<p> <font size=2 face="Verdana, Arial, Helvetica, sans-serif"><li ><a name="1206195"> </a><font size=2 face=Courier><strong>5512</strong></font> - selects STi5512 chip attributes which include an EMI3,</font></p>
<p> <font size=2 face="Verdana, Arial, Helvetica, sans-serif"><li ><a name="1206196"> </a><font size=2 face=Courier><strong>5514</strong></font> - selects STi5514 chip attributes which include an EMI4,</font></p>
<p> <font size=2 face="Verdana, Arial, Helvetica, sans-serif"><li ><a name="1206197"> </a><font size=2 face=Courier><strong>5518</strong></font> - selects STi5518 chip attributes which include an EMI3,</font></p>
<p> <font size=2 face="Verdana, Arial, Helvetica, sans-serif"><li ><a name="1206198"> </a><font size=2 face=Courier><strong>EMI2</strong></font> - selects EMI2 part attributes,</font></p>
<p> <font size=2 face="Verdana, Arial, Helvetica, sans-serif"><li ><a name="1206199"> </a><font size=2 face=Courier><strong>EMI3</strong></font> - selects EMI3 part attributes,</font></p>
<p> <font size=2 face="Verdana, Arial, Helvetica, sans-serif"><li ><a name="1206200"> </a><font size=2 face=Courier><strong>EMI4</strong></font> - selects EMI4 part attributes.</font></p>
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<p>
<a name="1206201"> </a><font size=2 face="Verdana, Arial, Helvetica, sans-serif">Some EMI parameter defaults are set dependent upon the <font size=2 face=Courier><strong>-chip</strong></font> option specified, and some EMI parameter options are only supported for certain chips. For example, the SDRAM padlogic options of <font face="Verdana, Arial, Helvetica, sans-serif"><b>bank3subdecode</b></font>, <font face="Verdana, Arial, Helvetica, sans-serif"><b>clockenable</b></font> and <font size=2 face=Courier><strong>clocktristate</strong></font> are only supported for <font face="Verdana, Arial, Helvetica, sans-serif"><b>chip 5512</b></font>.</font>
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<h3>
<a name="1206208"> </a><font color="#003366" face="Verdana, Arial, Helvetica, sans-serif">Example</font>
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<p>
<a name="1206209"> </a><font size=2 face="Verdana, Arial, Helvetica, sans-serif">If the following command was used to create an EMI file:</font>
</p>
<a name="1206210"> </a><font size=2 face=Courier><strong>stemi -chip 5510 -type SDRAM -o myemi.out<br></strong></font>
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<a name="1206211"> </a><font size=2 face="Verdana, Arial, Helvetica, sans-serif">the result would be the warning:</font>
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<a name="1206212"> </a><font size=2 face=Courier><strong>stemi: Error: option -type SDRAM not supported by chip 5510<br></strong></font>
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