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11<H1 align="left">DC_Unlockdown <IMG src="../../image/NTR.gif" align="middle"><IMG src="../../image/TWL.gif" align="middle"></H1>
12<H2>Syntax</H2>
13<DL>
14  <DD>
15  <PRE><CODE>#include &lt;nitro/os.h&gt;</CODE></PRE>
16  <PRE><CODE>void DC_Unlockdown( u32 num );</CODE></PRE>
17</DL>
18<H2>Arguments</H2>
19<TABLE border="1" width="100%">
20  <TBODY>
21    <TR>
22      <TD width="13%"><EM><STRONG>num</STRONG></EM></TD>
23      <TD width="87%">Designates the number of lockdown blocks to deallocate.</TD>
24    </TR>
25  </TBODY>
26</TABLE>
27<H2>Return Values</H2>
28<P>None.</P>
29<H2>Description</H2>
30<P>This function takes a data cache that has been locked with the <A href="DC_LockdownRange.html"><CODE>DC_LockdownRange</CODE></A> function, preventing it from being deleted, and releases this cache so it can be deleted when caches are replaced.</P>
31<P>This function releases, in order, a <I><B>num</B></I> number of lockdown blocks from the region that was last locked with the <CODE><A href="DC_LockdownRange.html">DC_LockdownRange</A></CODE> function.</P>
32<P>There are a maximum of three configurable lockdown blocks, so the maximum number of lockdown blocks that can be designated with <I><B>num</B></I> is also three.</P>
33<H2>Internal Operation</H2>
34<P>Operates registers 7 and 9 of the system control coprocessor.</P>
35<H2>See Also</H2>
36<P><CODE><A href="DC_LockdownRange.html">DC_LockdownRange</A>,<A href="DC_UnlockdownAll.html">DC_UnlockdownAll</A></CODE></P>
37<H2>Revision History</H2>
38<P>2005/01/21 Initial version.</P>
39<hr><p>CONFIDENTIAL</p></body>
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