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The variable <code>ram</code> uses the <code>lpm_ram_dq</code> function from the LPM library. The ports are initially defined and then mapped to the LPM ports, as shown in red text. The parameter values are then passed through with the keyword <code>defparam</code>. In this example, a 16 x 256 RAM block is instantiated; you can use a similar process to instantiate RAM blocks of other sizes.<p><p>The <code>lpm_file</code> parameter refers to the Memory Initialization File (<b>.mif</b>) that specifies the initial content of a memory block (RAM or ROM). An MIF is an ASCII text file can be created manually or saved from the output of a simulation. In an MIF, you are required to specify the memory depth and width values and optionally you can specify the radixes used to display and interpret addresses and data values. These values are shown in red text in the <a href="#mif">extract</a> from the sample file, <b>map_lpm_ram.mif</b>, which is included below. An MIF is used as an input file for memory initialization in the MAX+PLUS II Compiler and Simulator.</P>For more information on using this example in your project, go to:<UL TYPE=DISC> <LI><A HREF="verilog.html#using">How to Use Verilog HDL Examples</A> <LI>MAX+PLUS II Help</UL></P><HR noshade><P><B><I>RAMveri.v</I></B></P><PRE>// instantiation of lpm_ram_dq, 16-bit data, 256 address locationmodule map_lpm_ram (dataout, datain, addr, we, inclk, outclk);// port instantiationinput [15:0] datain;input [7:0] addr;input we, inclk, outclk;output [15:0] dataout;// instantiating lpm_ram_dq<font color="#FF0000">lpm_ram_dq ram (.data(datain), .address(addr), .we(we), .inclock(inclk), .outclock(outclk), .q(dataout));</font>// passing the parameter valuesdefparam ram.lpm_width = 16;defparam ram.lpm_widthad = 8;defparam ram.lpm_indata = "REGISTERED";defparam ram.lpm_outdata = "REGISTERED";defparam ram.lpm_file = "map_lpm_ram.mif";endmodule-----------------------------------------------------------------------------</pre><a name="mif"><h3>Extract from the MIF file </h3><p>Download <a href="map_lpm_ram.mif">map_lpm_ram.mif</a></p><pre><font color="#FF0000">WIDTH = 16;DEPTH = 256;ADDRESS_RADIX = HEX;DATA_RADIX = HEX;</font>CONTENT BEGIN 0 : ffff; 1 : 0000; 2 : bbf3; 3 : 0000; 4 : 0000; . . . fb : 0000; fc : 0000; fd : 0000; fe : 0000; ff : 0000;END;</PRE><HR noshade><h2>Feedback</h2><p>Did this information help you?</p><p>If no, please log onto <a href="https://mysupport.altera.com/eservice/">mySupport</a> to file a technical request or enhancement.</p><p><hr noshade></p><font size="-1">Altera does not warrant that this solution will work for the customer's intended purpose and disclaims all liability for use of or reliance on the solution.</font><!-- end content --><!--stopindex--> <p> </p> </td> <td rowspan="3" width="15"><img src="/common/template/spacer.gif" width="15" height="15" alt="" border="0"></td> </tr> <tr valign="top"> <td bgcolor="#e0e0e0" valign="top" width="161"> </td></tr><tr> <td bgcolor=#e0e0e0 valign="bottom" width="161" height="2"> <p class="footer"> <br> Contact Us<br> <a href="/corporate/contact/info/con-feedback_form.jsp">Please Give Us Feedback</a><br> <a href="/corporate/contact/signup/con-signup.jsp">Sign Up for E-mail Updates</a></p> </td></tr><!-- Footer Information --> <tr><td bgcolor="#0182C4" colspan="4" align="right"><img src="/common/template/footer_user.gif" width="761" height="18" usemap="#footer_user" border="0" alt="footer"><map name="footer_user"><area shape="rect" coords="521,3,578,16" href="/common/new_user.html" alt="New User to the Altera Web Site" title="New User to the Altera Web Site"><area shape="rect" coords="587,4,631,15" href="/common/sitemap.html" alt="Altera Site Map" title="Altera Site Map"><area shape="rect" coords="643,3,684,14" href="/common/privacy.html" alt="Altera Privacy Policy" title="Altera Privacy Policy"><area shape="rect" coords="690,3,757,14" href="/common/legal.html" alt="Altera Legal Notice" title="Altera Legal Notice"></map></td> </tr><tr> <td width="161"> </td> <td colspan="3" width="100%"class="footer"><br><!-- begin top level navigation (bottom) --><a href=/index.jsp>Home</a> | <a href=/products/prd-index.html>Products</a> | <a href=/support/spt-index.html>Support</a> | <a href=/solutions/sln-index.html>System Solutions</a> | <a href=/education/edu-index.html>Education & Events</a> | <a href=http://buy.altera.com/ecommerce/>Buy On-Line</a> | <a href=/corporate/crp-index.html>Corporate</a><br><!-- end top level navigation (bottom) --> <!-- begin second level navigation (bottom) --><a href=/mysupport >mySupport</a> | <a href=/support/kdb/spt-search_kdb.html>Knowledge Database</a> | <a href=/support/software/sof-index.html>Software</a> | <a href=/support/devices/dvs-index.html>Devices</a> | <a href=/support/examples/exm-index.html>Design Examples</a><br><!-- end second level navigation (bottom) --> <p class="footer">Copyright © 1995 - 2002 Altera Corporation, 101 Innovation Drive, San Jose, California 95134, USA.</p> </td> </tr> </table> </td></tr></table><!--startindex--></body></html>?? 快捷鍵說(shuō)明
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