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<div>LEF/DEF 5.8 Language Reference</div>
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<h1>2<a name="918624"> </a></h1>
<h1><a name="919793">ALIAS Statements</a></h1>
<p><a name="920496">This chapter contains information about the following topics. </a></p>
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<td><a href="#ALIAS Statements" title="2" name="920506"><font color="Blue"><u>ALIAS Statements</u></font></a><a href="#ALIAS Statements" title="2"> </a></td>
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<td><a href="#Alias Definition" title="2" name="920508"><font color="Blue"><u>ALIAS Definition</u></font></a><a href="#Alias Definition" title="2"> </a></td>
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<td><a href="#Alias Examples" title="2" name="921270"><font color="Blue"><u>ALIAS Examples</u></font></a><a href="#Alias Examples" title="2"> </a></td>
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<td><a href="#Alias Expansion" title="2" name="921274"><font color="Blue"><u>ALIAS Expansion</u></font></a><a href="#Alias Expansion" title="2"> </a></td>
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<h2><a name="ALIAS Statements"></a><a name="918778">ALIAS Statements</a></h2>
<p><a name="918780">You can use alias statements in LEF and DEF files to define commands or parameters associated with the library or design.</a><strong> </strong>An alias statement can appear anywhere in a LEF or DEF file as follows:</p>
<blockquote>
<font size="2" face=""Courier New"" color="#000000"></font>
<font size="2" face=""Courier New"" color="#000000"><a name="918781">&ALIAS &&</a><font size="2" face="'Courier New'" color="#000000"><em>aliasName</em></font> = <em> </em><font size="2" face="'Courier New'" color="#000000"><em>aliasDefinition</em></font> &ENDALIAS</font>
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<p><a name="918782"><font size="2" face="'Courier New'" color="#000000">&ALIAS</font></a> and <font size="2" face="'Courier New'" color="#000000">&ENDALIAS</font> are both reserved keywords and are not case sensitive. An alias statement has the following requirements:</p>
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<td><a name="918783"><font size="2" face="'Courier New'" color="#000000">&ALIAS</font></a> must be the first token in the line in which it appears.</td>
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<td><a name="918784"><font color="#000000"><em>aliasName </em></font></a>is string name and must appear on the same line as <font color="#000000"><em>&ALIAS. </em></font>It is case sensitive based on the value of <font size="2" face="'Courier New'" color="#000000">NAMESCASENSITIVE</font> in the LEF input, or the value of <font size="2" face="'Courier New'" color="#000000">Input.Lef.Names.Case.Sensitive</font><font color="#000000"><em>.</em></font></td>
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<td><a name="918785"><font color="#000000"><em>aliasName </em></font></a>cannot contain any of the following special characters: #, space, tab, or control characters.</td>
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<td><a name="918786"><font size="2" face="'Courier New'" color="#000000">&ENDALIAS</font></a> must be the last token in the line in which it appears.</td>
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<td><a name="918787">Multiple commands can appear in the alias definition, separated by semicolons. However, the last command must not be terminated by a semicolon. </a></td>
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<h3><a name="Alias Definition"></a><a name="918790">ALIAS Definition</a></h3>
<p><a name="918791">The alias name (</a><font color="#000000"><em>aliasName</em></font>) is an identifier for the associated alias definition (<font color="#000000"><em>aliasDefinition</em></font>). The data reader stores the alias definition in the database. If the associated alias name already exists in the database, a warning is issued and the existing definition is replaced.</p>
<p><a name="918792">Alias definitions are text strings with the following properties:</a></p>
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<td><a name="918793"><font color="#000000"><em>aliasDefinition</em></font></a> is any text excluding "<font size="2" face="'Courier New'" color="#000000">&ENDALIAS</font>".</td>
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<td><a name="918794">All EOL, space, and tab characters are preserved.</a></td>
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<td><a name="918795"><font color="#000000"><em>aliasDefinition</em></font></a> text can expand to multiple lines.</td>
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<h3><a name="Alias Examples"></a><a name="918797">ALIAS Examples</a></h3>
<p><a name="918798">The following examples include legal and illegal alias statements:</a></p>
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<td><a name="918799">The following statement is legal.</a></td>
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<font size="2" face=""Courier New"" color="#000000"></font>
<font size="2" face=""Courier New"" color="#000000"><a name="918800">&ALIAS &&MAC = SROUTE ADDCELL AREA &&CORE &ENDALIAS</a></font>
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<td><a name="918801">The following statement is illegal because </a><font size="2" face="'Courier New'" color="#000000">MAC</font> does not start with "<font size="2" face="'Courier New'" color="#000000">&&</font>".</td>
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<font size="2" face=""Courier New"" color="#000000"></font>
<font size="2" face=""Courier New"" color="#000000"><a name="918802">&ALIAS MAC = SROUTE AREA &&CORE &ENDALIAS</a></font>
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<td><a name="918803">The following statement is illegal because </a><font size="2" face="'Courier New'" color="#000000">&ALIAS</font> is not the first token in this line.</td>
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<font size="2" face=""Courier New"" color="#000000"></font>
<font size="2" face=""Courier New"" color="#000000"><a name="918804">( 100 200 ) &ALIAS &&MAC = SROUTE AREA &&CORE &ENDALIAS</a></font>
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<td><a name="918805">The following statement is legal. It contains multiple commands; the last command is not terminated by a semicolon.</a></td>
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<font size="2" face=""Courier New"" color="#000000"></font>
<font size="2" face=""Courier New"" color="#000000"><a name="918806">$ALIAS $$ = INPUT LEF myfile.txt;<br>VERIFY LIBRARY<br>ENDALIAS</a></font>
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<p><a name="918807">The following examples show legal and illegal alias names:</a></p>
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<td><a name="918808">"</a><font size="2" face="'Courier New'" color="#000000">Engineer_change</font>" is a legal alias name.</td>
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<font size="2" face=""Courier New"" color="#000000"></font>
<font size="2" face=""Courier New"" color="#000000"><a name="918809">&&Engineer_change</a></font>
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<td><a name="918810">"</a><font size="2" face="'Courier New'" color="#000000">&Version&History&&</font>" is a legal alias name.</td>
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<font size="2" face=""Courier New"" color="#000000"></font>
<font size="2" face=""Courier New"" color="#000000"><a name="918811">&&&Version&History&&</a></font>
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<td><a name="918812">"</a><font size="2" face="'Courier New'" color="#000000">design history</font>" is an illegal alias name. It contains a space character and is considered as two tokens: an <font color="#000000"><em>aliasName </em></font>token "<font size="2" face="'Courier New'" color="#000000">&&design</font>," and a non-<font color="#000000"><em>aliasName </em></font>token "<font size="2" face="'Courier New'" color="#000000">history</font>".</td>
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<font size="2" face=""Courier New"" color="#000000"></font>
<font size="2" face=""Courier New"" color="#000000"><a name="918813">&&design history</a></font>
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<td><a name="918814">"</a><font size="2" face="'Courier New'" color="#000000">someName#IO-pin-Num</font>" is an illegal alias name. It contains a "#" character and is translated as one <font color="#000000"><em>aliasName </em></font>token "<font size="2" face="'Courier New'" color="#000000">&&someName</font>". The "#" is considered a comment character.</td>
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<font size="2" face=""Courier New"" color="#000000"></font>
<font size="2" face=""Courier New"" color="#000000"><a name="918815">&&someName#IO-pin-Num</a></font>
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<h3><a name="Alias Expansion"></a><a name="918818">ALIAS Expansion</a></h3>
<p><a name="918819">Alias expansion is the reverse operation of alias definition. The following is the syntax for alias expansion.</a></p>
<blockquote>
<font size="2" face="Courier" color="#000000"></font>
<font size="2" face="Courier" color="#000000"><a name="918820"><font size="2" face="'Courier New'" color="#000000">&&</font></a><font size="2" face="'Courier New'" color="#000000"><em>aliasName</em></font></font>
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<p><a name="918821">where </a><font color="#000000"><em>aliasName </em></font>is any name previously defined by an alias statement. If an <font color="#000000"><em>aliasName </em></font>does not exist in the database, no substitution occurs.</p>
<p><a name="918822">You use aliases as string expansion parameters for LEF or DEF files. An alias can substitute for any token of a LEF or DEF file.</a></p>
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