<TABLE>
<TR  bgcolor="#C0C0C0">
<TH>Hierarchy</TH>
<TH>Input</TH>
<TH>Constant Input</TH>
<TH>Unused Input</TH>
<TH>Floating Input</TH>
<TH>Output</TH>
<TH>Constant Output</TH>
<TH>Unused Output</TH>
<TH>Floating Output</TH>
<TH>Bidir</TH>
<TH>Constant Bidir</TH>
<TH>Unused Bidir</TH>
<TH>Input only Bidir</TH>
<TH>Output only Bidir</TH>
</TR>
</TABLE>