</TR>
<TR><TD WIDTH="21%" VALIGN="MIDDLE">&nbsp;</TD>
<TD WIDTH="79%" VALIGN="MIDDLE" COLSPAN=2>
<FONT COLOR="#000000"><P ALIGN="JUSTIFY">For a scalar signal S, S'EVENT returns the value TRUE if an event has occurred on S during the current simulation cycle; otherwise, it returns the value FALSE. </FONT></TD>
</TR>
<TR><TD WIDTH="21%" VALIGN="MIDDLE">&nbsp;</TD>
<TD WIDTH="79%" VALIGN="MIDDLE" COLSPAN=2>
<FONT COLOR="#000000"><P ALIGN="JUSTIFY">For a composite signal S, S'EVENT returns TRUE if an event has occurred on any scalar subelement of S during the current simulation cycle; otherwise, it returns FALSE. </FONT></TD>
</TR>
<TR><TD WIDTH="21%" VALIGN="MIDDLE">
<FONT COLOR="#000000"><P ALIGN="JUSTIFY"><A NAME="S_ACTIVE">S'ACTIVE</A></FONT></TD>
<TD WIDTH="40%" VALIGN="TOP">&nbsp;</TD>
<TD WIDTH="40%" VALIGN="TOP">&nbsp;</TD>
</TR>
<TR><TD WIDTH="21%" VALIGN="MIDDLE">&nbsp;</TD>
<TD WIDTH="40%" VALIGN="TOP">
<FONT COLOR="#000000"><P ALIGN="JUSTIFY">Kind:</FONT></TD>
<TD WIDTH="40%" VALIGN="TOP">
<FONT COLOR="#000000"><P ALIGN="JUSTIFY">Function. </FONT></TD>
</TR>
<TR><TD WIDTH="21%" VALIGN="MIDDLE">&nbsp;</TD>
<TD WIDTH="40%" VALIGN="TOP">
<FONT COLOR="#000000"><P ALIGN="JUSTIFY">Prefix:</FONT></TD>
<TD WIDTH="40%" VALIGN="TOP">
<FONT COLOR="#000000"><P ALIGN="JUSTIFY">Any signal denoted by the static signal name S. </FONT></TD>
</TR>
<TR><TD WIDTH="21%" VALIGN="MIDDLE">&nbsp;</TD>
<TD WIDTH="40%" VALIGN="TOP">
<FONT COLOR="#000000"><P ALIGN="JUSTIFY">Result Type:</FONT></TD>
<TD WIDTH="40%" VALIGN="TOP">
<FONT COLOR="#000000"><P ALIGN="JUSTIFY">Type Boolean. </FONT></TD>
</TR>
<TR><TD WIDTH="21%" VALIGN="MIDDLE">&nbsp;</TD>
<TD WIDTH="40%" VALIGN="TOP">
<FONT COLOR="#000000"><P ALIGN="JUSTIFY">Result:</FONT></TD>
<TD WIDTH="40%" VALIGN="TOP">
<FONT COLOR="#000000"><P ALIGN="JUSTIFY">A value that indicates whether signal S is active. Specifically: </FONT></TD>
</TR>
<TR><TD WIDTH="21%" VALIGN="MIDDLE">&nbsp;</TD>
<TD WIDTH="79%" VALIGN="MIDDLE" COLSPAN=2>
<FONT COLOR="#000000"><P ALIGN="JUSTIFY">For a scalar signal S, S'ACTIVE returns the value TRUE if signal S is active during the current simulation cycle; otherwise, it returns the value FALSE. </FONT></TD>
</TR>
<TR><TD WIDTH="21%" VALIGN="MIDDLE">&nbsp;</TD>
<TD WIDTH="79%" VALIGN="MIDDLE" COLSPAN=2>
<FONT COLOR="#000000"><P ALIGN="JUSTIFY">For a composite signal S, S'ACTIVE returns TRUE if any scalar subelement of S is active during the current simulation cycle; otherwise, it returns FALSE. </FONT></TD>
</TR>
<TR><TD WIDTH="21%" VALIGN="MIDDLE">
<FONT COLOR="#000000"><P ALIGN="JUSTIFY"><A NAME="S_LAST_EVENT">S'LAST_EVENT</A></FONT></TD>
<TD WIDTH="40%" VALIGN="TOP">&nbsp;</TD>
<TD WIDTH="40%" VALIGN="TOP">&nbsp;</TD>
</TR>
<TR><TD WIDTH="21%" VALIGN="MIDDLE">&nbsp;</TD>
<TD WIDTH="40%" VALIGN="TOP">
<FONT COLOR="#000000"><P ALIGN="JUSTIFY">Kind:</FONT></TD>
<TD WIDTH="40%" VALIGN="TOP">
<FONT COLOR="#000000"><P ALIGN="JUSTIFY">Function. </FONT></TD>
</TR>
<TR><TD WIDTH="21%" VALIGN="MIDDLE">&nbsp;</TD>
<TD WIDTH="40%" VALIGN="TOP">
<FONT COLOR="#000000"><P ALIGN="JUSTIFY">Prefix:</FONT></TD>
<TD WIDTH="40%" VALIGN="TOP">
<FONT COLOR="#000000"><P ALIGN="JUSTIFY">Any signal denoted by the static signal name S. </FONT></TD>
</TR>
<TR><TD WIDTH="21%" VALIGN="MIDDLE">&nbsp;</TD>
<TD WIDTH="40%" VALIGN="TOP">
<FONT COLOR="#000000"><P ALIGN="JUSTIFY">Result Type: </FONT></TD>
<TD WIDTH="40%" VALIGN="TOP">
<FONT COLOR="#000000"><P ALIGN="JUSTIFY">Type Time. </FONT></TD>
</TR>
<TR><TD WIDTH="21%" VALIGN="MIDDLE">&nbsp;</TD>
<TD WIDTH="40%" VALIGN="TOP">
<FONT COLOR="#000000"><P ALIGN="JUSTIFY">Result:</FONT></TD>
<TD WIDTH="40%" VALIGN="TOP">
<FONT COLOR="#000000"><P ALIGN="JUSTIFY">The amount of time that has elapsed since the last event occurred on signal S. Specifically: </FONT></TD>
</TR>
<TR><TD WIDTH="21%" VALIGN="MIDDLE">&nbsp;</TD>
<TD WIDTH="79%" VALIGN="MIDDLE" COLSPAN=2>
<FONT COLOR="#000000"><P ALIGN="JUSTIFY">For a signal S, S'LAST_EVENT returns the smallest value T of type TIME such that S'EVENT = True during any simulation cycle at time NOW - T, if such value exists; otherwise, it returns TIME'HIGH. </FONT></TD>
</TR>
<TR><TD WIDTH="21%" VALIGN="MIDDLE">
<FONT COLOR="#000000"><P ALIGN="JUSTIFY"><A NAME="S_LAST_ACTIVE">S'LAST_ACTIVE</A></FONT></TD>
<TD WIDTH="40%" VALIGN="TOP">&nbsp;</TD>
<TD WIDTH="40%" VALIGN="TOP">&nbsp;</TD>
</TR>
<TR><TD WIDTH="21%" VALIGN="MIDDLE">&nbsp;</TD>
<TD WIDTH="40%" VALIGN="TOP">
<FONT COLOR="#000000"><P ALIGN="JUSTIFY">Kind:</FONT></TD>
<TD WIDTH="40%" VALIGN="TOP">
<FONT COLOR="#000000"><P ALIGN="JUSTIFY">Function. </FONT></TD>
</TR>
<TR><TD WIDTH="21%" VALIGN="MIDDLE">&nbsp;</TD>
<TD WIDTH="40%" VALIGN="TOP">
<FONT COLOR="#000000"><P ALIGN="JUSTIFY">Prefix:</FONT></TD>
<TD WIDTH="40%" VALIGN="TOP">
<FONT COLOR="#000000"><P ALIGN="JUSTIFY">Any signal denoted by the static signal name S. </FONT></TD>
</TR>
<TR><TD WIDTH="21%" VALIGN="MIDDLE">&nbsp;</TD>
<TD WIDTH="40%" VALIGN="TOP">
<FONT COLOR="#000000"><P ALIGN="JUSTIFY">Result Type:</FONT></TD>
<TD WIDTH="40%" VALIGN="TOP">
<FONT COLOR="#000000"><P ALIGN="JUSTIFY">Type Time. </FONT></TD>
</TR>
<TR><TD WIDTH="21%" VALIGN="MIDDLE">&nbsp;</TD>
<TD WIDTH="40%" VALIGN="TOP">
<FONT COLOR="#000000"><P ALIGN="JUSTIFY">Result:</FONT></TD>
<TD WIDTH="40%" VALIGN="TOP">
<FONT COLOR="#000000"><P ALIGN="JUSTIFY">The amount of time that has elapsed since the last time at which signal S was active. Specifically: </FONT></TD>
</TR>
<TR><TD WIDTH="21%" VALIGN="MIDDLE">&nbsp;</TD>
<TD WIDTH="79%" VALIGN="MIDDLE" COLSPAN=2>
<FONT COLOR="#000000"><P ALIGN="JUSTIFY">For a signal S, S'LAST_ACTIVE returns the smallest value T of type TIME such that S'ACTIVE = True during any simulation cycle at time NOW - T, if such value exists; otherwise, it returns TIME'HIGH. </FONT></TD>
</TR>
<TR><TD WIDTH="21%" VALIGN="MIDDLE">
<FONT COLOR="#000000"><P ALIGN="JUSTIFY"><A NAME="S_LAST_VALUE">S'LAST_VALUE</A></FONT></TD>
<TD WIDTH="40%" VALIGN="TOP">&nbsp;</TD>
<TD WIDTH="40%" VALIGN="TOP">&nbsp;</TD>
</TR>
<TR><TD WIDTH="21%" VALIGN="MIDDLE">&nbsp;</TD>
<TD WIDTH="40%" VALIGN="TOP">
<FONT COLOR="#000000"><P ALIGN="JUSTIFY">Kind: </FONT></TD>
<TD WIDTH="40%" VALIGN="TOP">
<FONT COLOR="#000000"><P ALIGN="JUSTIFY">Function. </FONT></TD>
</TR>
<TR><TD WIDTH="21%" VALIGN="MIDDLE">&nbsp;</TD>
<TD WIDTH="40%" VALIGN="TOP">
<FONT COLOR="#000000"><P ALIGN="JUSTIFY">Prefix:</FONT></TD>
<TD WIDTH="40%" VALIGN="TOP">
<FONT COLOR="#000000"><P ALIGN="JUSTIFY">Any signal denoted by the static signal name S. </FONT></TD>
</TR>
<TR><TD WIDTH="21%" VALIGN="MIDDLE">&nbsp;</TD>
<TD WIDTH="40%" VALIGN="TOP">
<FONT COLOR="#000000"><P ALIGN="JUSTIFY">Result Type:</FONT></TD>
<TD WIDTH="40%" VALIGN="TOP">
<FONT COLOR="#000000"><P ALIGN="JUSTIFY">The base type of S. </FONT></TD>
</TR>
<TR><TD WIDTH="21%" VALIGN="MIDDLE">&nbsp;</TD>
<TD WIDTH="40%" VALIGN="TOP">
<FONT COLOR="#000000"><P ALIGN="JUSTIFY">Result:</FONT></TD>
<TD WIDTH="40%" VALIGN="TOP">
<FONT COLOR="#000000"><P ALIGN="JUSTIFY">The previous value of S, immediately before the last change of S. </FONT></TD>
</TR>
<TR><TD WIDTH="21%" VALIGN="MIDDLE">
<FONT COLOR="#000000"><P ALIGN="JUSTIFY"><A NAME="S_DRIVING">S'DRIVING</A></FONT></TD>
<TD WIDTH="40%" VALIGN="TOP">&nbsp;</TD>
<TD WIDTH="40%" VALIGN="TOP">&nbsp;</TD>
</TR>
<TR><TD WIDTH="21%" VALIGN="MIDDLE">&nbsp;</TD>
<TD WIDTH="40%" VALIGN="TOP">
<FONT COLOR="#000000"><P ALIGN="JUSTIFY">Kind: </FONT></TD>
<TD WIDTH="40%" VALIGN="TOP">
<FONT COLOR="#000000"><P ALIGN="JUSTIFY">Function. </FONT></TD>
</TR>
<TR><TD WIDTH="21%" VALIGN="MIDDLE">&nbsp;</TD>
<TD WIDTH="40%" VALIGN="TOP">
<FONT COLOR="#000000"><P ALIGN="JUSTIFY">Prefix:</FONT></TD>
<TD WIDTH="40%" VALIGN="TOP">
<FONT COLOR="#000000"><P ALIGN="JUSTIFY">Any signal denoted by the static signal name S. </FONT></TD>
</TR>
<TR><TD WIDTH="21%" VALIGN="MIDDLE">&nbsp;</TD>
<TD WIDTH="40%" VALIGN="TOP">
<FONT COLOR="#000000"><P ALIGN="JUSTIFY">Result Type:</FONT></TD>
<TD WIDTH="40%" VALIGN="TOP">
<FONT COLOR="#000000"><P ALIGN="JUSTIFY">Type Boolean. </FONT></TD>
</TR>
<TR><TD WIDTH="21%" VALIGN="MIDDLE">&nbsp;</TD>
<TD WIDTH="40%" VALIGN="TOP">
<FONT COLOR="#000000"><P ALIGN="JUSTIFY">Result:</FONT></TD>
<TD WIDTH="40%" VALIGN="TOP">
<FONT COLOR="#000000"><P ALIGN="JUSTIFY">If the prefix denotes a scalar signal, the result is False if the current value of the driver for S in the current process is determined by the null transaction; True otherwise. If the prefix denotes a composite signal,the result is True if and only if R'DRIVING is True for every scalar subelement R of S; False otherwise. If the prefix denotes a null slice of a signal, the result is True. </FONT></TD>
</TR>
<TR><TD WIDTH="21%" VALIGN="MIDDLE">&nbsp;</TD>
<TD WIDTH="40%" VALIGN="TOP">
<FONT COLOR="#000000"><P ALIGN="JUSTIFY">Restrictions:</FONT></TD>
<TD WIDTH="40%" VALIGN="TOP">
<FONT COLOR="#000000"><P ALIGN="JUSTIFY">This attribute is available only from within a process, a concurrent statement with an equivalent process, or a subprogram. If the prefix denotes a port, it is an error if the port does not have a mode of <B>inout</B>, <B>out</B>, or <B>buffer</B>. It is also an error if the attribute name appears in a subprogram body that is not a declarative item contained within a process statement and the prefix is not a formal parameter of the given subprogram or of a parent of that subprogram. Finally, it is an error if the prefix denotes a subprogram formal parameter whose mode is not <B>inout</B> or <B>out</B>. </FONT></TD>
</TR>
<TR><TD WIDTH="21%" VALIGN="MIDDLE">
<FONT COLOR="#000000"><P ALIGN="JUSTIFY"><A NAME="S_DRIVING_VALUE">S'DRIVING_VALUE</A></FONT></TD>
<TD WIDTH="40%" VALIGN="TOP">&nbsp;</TD>
<TD WIDTH="40%" VALIGN="TOP">&nbsp;</TD>
</TR>
<TR><TD WIDTH="21%" VALIGN="MIDDLE">&nbsp;</TD>
<TD WIDTH="40%" VALIGN="TOP">
<FONT COLOR="#000000"><P ALIGN="JUSTIFY">Kind: </FONT></TD>
<TD WIDTH="40%" VALIGN="TOP">
<FONT COLOR="#000000"><P ALIGN="JUSTIFY">Function. </FONT></TD>
</TR>
<TR><TD WIDTH="21%" VALIGN="MIDDLE">&nbsp;</TD>
<TD WIDTH="40%" VALIGN="TOP">
<FONT COLOR="#000000"><P ALIGN="JUSTIFY">Prefix:</FONT></TD>
<TD WIDTH="40%" VALIGN="TOP">
<FONT COLOR="#000000"><P ALIGN="JUSTIFY">Any signal denoted by the static signal name S. </FONT></TD>
</TR>
<TR><TD WIDTH="21%" VALIGN="MIDDLE">&nbsp;</TD>
<TD WIDTH="40%" VALIGN="TOP">
<FONT COLOR="#000000"><P ALIGN="JUSTIFY">Result Type:</FONT></TD>
<TD WIDTH="40%" VALIGN="TOP">
<FONT COLOR="#000000"><P ALIGN="JUSTIFY">The base type of S. </FONT></TD>
</TR>
<TR><TD WIDTH="21%" VALIGN="MIDDLE">&nbsp;</TD>
<TD WIDTH="40%" VALIGN="TOP">
<FONT COLOR="#000000"><P ALIGN="JUSTIFY">Result:</FONT></TD>
<TD WIDTH="40%" VALIGN="TOP">
<FONT COLOR="#000000"><P ALIGN="JUSTIFY">If S is a scalar signal S, the result is the current value of the driver for S in the current process. If S is a composite signal, the result is the aggregate of the values of R'DRIVING_VALUE for each element R of S. If Sis a null slice, the result is a null slice. </FONT></TD>
</TR>
<TR><TD WIDTH="21%" VALIGN="MIDDLE">&nbsp;</TD>
<TD WIDTH="40%" VALIGN="TOP">
<FONT COLOR="#000000"><P ALIGN="JUSTIFY">Restrictions:</FONT></TD>
<TD WIDTH="40%" VALIGN="TOP">
<FONT COLOR="#000000"><P ALIGN="JUSTIFY">This attribute is available only from within a process, a concurrent statement with an equivalent process, or a subprogram. If the prefix denotes a port, it is an error if the port does not have a mode of <B>inout</B>, <B>out</B>, or <B>buffer</B>. It is also an error if the attribute appears in a subprogram body that is not a declarative item contained within a process statement and the prefix is not a formal parameter of the given subprogram or of a parent of that subprogram. Finally, it is an error if the prefix denotes a subprogram formal parameter whose mode is not <B>inout</B> or <B>out</B>, or if S'DRIVING is False at the time of the evaluation of S'DRIVING_VALUE. </FONT></TD>
</TR>
<TR><TD WIDTH="21%" VALIGN="MIDDLE">
<FONT COLOR="#000000"><P ALIGN="JUSTIFY"><A NAME="E_SIMPLE_NAME">E'SIMPLE_NAME</A></FONT></TD>
<TD WIDTH="40%" VALIGN="TOP">&nbsp;</TD>
<TD WIDTH="40%" VALIGN="TOP">&nbsp;</TD>
</TR>
<TR><TD WIDTH="21%" VALIGN="MIDDLE">&nbsp;</TD>
<TD WIDTH="40%" VALIGN="TOP">
<FONT COLOR="#000000"><P ALIGN="JUSTIFY">Kind:</FONT></TD>
<TD WIDTH="40%" VALIGN="TOP">
<FONT COLOR="#000000"><P ALIGN="JUSTIFY">Value. </FONT></TD>
</TR>
<TR><TD WIDTH="21%" VALIGN="MIDDLE">&nbsp;</TD>
<TD WIDTH="40%" VALIGN="TOP">
<FONT COLOR="#000000"><P ALIGN="JUSTIFY">Prefix:</FONT></TD>
<TD WIDTH="40%" VALIGN="TOP">
<FONT COLOR="#000000"><P ALIGN="JUSTIFY">Any named entity as defined in </FONT><A HREF="1076_5.HTM#5.1"><FONT COLOR="#000000">5.1 </FONT></A><FONT COLOR="#000000">. </FONT></TD>
</TR>
<TR><TD WIDTH="21%" VALIGN="MIDDLE">&nbsp;</TD>
<TD WIDTH="40%" VALIGN="TOP">
<FONT COLOR="#000000"><P ALIGN="JUSTIFY">Result Type: </FONT></TD>
<TD WIDTH="40%" VALIGN="TOP">
<FONT COLOR="#000000"><P ALIGN="JUSTIFY">Type String. </FONT></TD>
</TR>
<TR><TD WIDTH="21%" VALIGN="MIDDLE">&nbsp;</TD>
<TD WIDTH="40%" VALIGN="TOP">
<FONT COLOR="#000000"><P ALIGN="JUSTIFY">Result:</FONT></TD>
<TD WIDTH="40%" VALIGN="TOP">
<FONT COLOR="#000000"><P ALIGN="JUSTIFY">The simple name, character literal, or operator symbol of the named entity, without leading or trailing whitespace or quotation marks but with apostrophes (in the case of a character literal) and both a leading and trailing reverse solidus (backslash) (in the case of an extended identifier).In the case of a simple name or operator symbol, the characters are converted to their lowercase equivalents. In the case of an extended identifier, the case of the identifier preserved, and any reverse solidus characters appearing as part of the identifier are represented with two consecutive reverse solidus characters. </FONT></TD>
</TR>
<TR><TD WIDTH="21%" VALIGN="MIDDLE">
<FONT COLOR="#000000"><P ALIGN="JUSTIFY"><A NAME="E_INSTANCE_NAME">E'INSTANCE_NAME</A></FONT></TD>
<TD WIDTH="40%" VALIGN="TOP">&nbsp;</TD>
<TD WIDTH="40%" VALIGN=