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📁 用VHDL编写的串口异步通信的例子
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<!doctype html public "-//w3c//dtd html 4.0 transitional//en"><html><head>   <meta http-equiv="Content-Type" content="text/html; charset=iso-8859-1">   <meta name="generator" content="RoboHELP by eHelp Corporation - www.ehelp.com">   <meta name="generator-major-version" content="0.1">   <meta name="generator-minor-version" content="1">   <meta name="filetype" content="kadov">   <meta name="filetype-version" content="1">   <meta name="page-count" content="1">   <meta name="layout-height" content="3556">   <meta name="layout-width" content="670">   <meta name="date" content="05 24, 2002 6:03:49 PM">   <meta name="GENERATOR" content="Mozilla/4.79 [en]C-CCK-MCD   (Windows NT 5.0; U) [Netscape]">   <title>Function Block Specifics</title><!--(==============================================================)--><!--(Document created with RoboEditor. )============================--><!--(==============================================================)--><!--(Meta)==========================================================--><style><!--p.whs1 {font-family: arial, sans-serif; font-size: 10pt;}p.whs2 {font-family: arial, sans-serif; font-size: 12pt;}p.whs3 {font-family: arial, sans-serif; font-size: 12pt;}h4.whs4 {font-family: arial, sans-serif;}ul.whs5 {list-style: disc;}p.whs6 {margin-left: 80px;}ul.whs7 {list-style: disc;}p.whs8 {margin-left: 80px;}ul.whs9 {list-style: disc;}p.whs10 {margin-left: 80px; font-family: arial, sans-serif; font-size: 10pt;}p.whs11 {margin-left: 80px; font-family: arial, sans-serif; font-size: 10pt;}ul.whs12 {list-style: disc;}ul.whs13 {list-style: disc;}p.whs14 {margin-left: 80px;}p.whs15 {font-weight: bold; font-family: arial, sans-serif; font-size: 10pt; margin-left: 120px;}ul.whs16 {list-style: disc;}p.whs17 {margin-left: 80px;}p.whs18 {margin-left: 80px;}h4.whs19 {font-family: arial, sans-serif;}p.whs20 {font-family: arial, sans-serif; font-size: 10pt;}p.whs21 {font-family: arial, sans-serif; font-size: 10pt;}p.whs22 {font-family: arial, sans-serif; font-size: 10pt;}p.whs23 {font-family: arial, sans-serif; font-size: 10pt;}p.whs24 {font-family: arial, sans-serif; font-size: 10pt;}p.whs25 {font-family: arial, sans-serif; font-size: 10pt;}p.whs26 {font-family: arial, sans-serif; font-size: 10pt;}ul.whs27 {list-style: disc;}p.whs28 {font-family: arial, sans-serif; font-size: 10pt;}p.whs29 {font-family: arial, sans-serif; font-size: 10pt;}p.whs30 {font-family: arial, sans-serif; font-size: 10pt;}p.whs31 {font-family: arial, sans-serif; font-size: 10pt;}p.whs32 {font-family: arial, sans-serif; font-size: 10pt;}--></style><script language="javascript" title="WebHelpInlineScript"><!--function reDo() {  if (innerWidth != origWidth || innerHeight != origHeight)     location.reload();}if ((parseInt(navigator.appVersion) == 4) && (navigator.appName == "Netscape")) {	origWidth = innerWidth;	origHeight = innerHeight;	onresize = reDo;}//--></script><style><!--  div.WebHelpPopupMenu {position:absolute; left:0px; top:0px; z-index:4; visibility:hidden;}  p.WebHelpNavBar {text-align:right;}--></style><!--(Body)==========================================================--></head><body><h1>Function Block Specifics</h1><div class="whs1">To access specific details for a particular functionblock, click on that function block in either the <a href="maplogicdoc.htm">MappedLogic</a>, <a href="mapinputdoc.htm">Mapped Inputs</a>, or <a href="fbsdoc.htm" style="font-family: arial, sans-serif; font-size: 10pt;">FunctionBlocks</a> sections of the fitter report.&nbsp;<!--kadov_tag{{<spaces>}}--><!--kadov_tag{{</spaces>}}-->Thefunction block details page displays a table of details about the particularfunction block you selected, a view button you can click to show a graphicaldisplay of the function block, and a pulldown menu you can use to selectother function blocks to see.</div><p class="whs2">The Table<p class="whs3">The View<p><script LANGUAGE="JavaScript"><!--if (navigator.appName=="Netscape"){ document.write("<img src='xml5.jpg' x-maintain-ratio='TRUE' width='648' height='397' border='0'>");}else{ document.write("<img src='xml5.jpg' x-maintain-ratio='TRUE' style='border: none; width: 648px; height: 397px; float: none;' width='648' height='397' border='0'>");}//--></script><h4 class="whs4"><a NAME="table"></a>The Table</h4><span style="font-family: arial, sans-serif; font-size: 10pt;"><font size=-1>Thetable at the top of the function block details page provides the followinginformation about the function block:</font></span><ul type="disc" class="whs5"><li class="kadov-p" class="kadov-p"><span style="font-family: arial, sans-serif; font-size: 10pt;"><font size=-1>Thesignal name&nbsp;</font></span></li></ul><div class="whs6"><span style="font-weight: bold;											font-family: arial, sans-serif;											font-size: 10pt;"><font size=-1><b>Note:</span><span  style="font-family: arial, sans-serif; font-size: 10pt;"></b>Clicking on a signal name will open a new window with the equations forthat signal.&nbsp;</font></span></div><ul type="disc" class="whs7"><li class="kadov-p" class="kadov-p"><span style="font-family: arial, sans-serif; font-size: 10pt;"><font size=-1>Thetotal product terms used&nbsp;</font></span></li><li class="kadov-p" class="kadov-p"><span style="font-family: arial, sans-serif; font-size: 10pt;"><!--kadov_tag{{<spaces>}}--><font size=-1>&nbsp;<!--kadov_tag{{</spaces>}}-->Alist of product terms</font></span></li></ul><div class="whs8"><span style="font-weight: bold;											font-family: arial, sans-serif;											font-size: 10pt;"><font size=-1><b>Note:</span><span  style="font-family: arial, sans-serif; font-size: 10pt;"></b>Clicking on a&nbsp;<!--kadov_tag{{<spaces>}}--><!--kadov_tag{{</spaces>}}-->productterm will open a new window with the equations for that term.&nbsp;</font></span></div><ul type="disc" class="whs9"><li class="kadov-p" class="kadov-p"><span style="font-family: arial, sans-serif; font-size: 10pt;"><font size=-1>Themacrocell number in which the function block is located</font></span></li></ul><div class="whs10"><span style="font-family: arial, sans-serif; font-size: 10pt;"><span  style="font-weight: bold;"><font size=-1><b>Note:</span></b>Clicking on the underscored macrocell number will provide a graphical displayof the macrocell that looks like this:</font></span></div><p class="whs11"><script LANGUAGE="JavaScript"><!--if (navigator.appName=="Netscape"){ document.write("<img src='macrocell.gif' x-maintain-ratio='TRUE' width='540' height='420' border='0'>");}else{ document.write("<img src='macrocell.gif' x-maintain-ratio='TRUE' style='border: none; width: 540px; height: 420px; float: none;' width='540' height='420' border='0'>");}//--></script>.<ul type="disc" class="whs12"><li class="kadov-p" class="kadov-p"><span style="font-family: arial, sans-serif; font-size: 10pt;"><font size=-1>Thepower mode</font></span></li><li class="kadov-p" class="kadov-p"><span style="font-family: arial, sans-serif; font-size: 10pt;"><font size=-1>Thepin number - an asterisk "*" indicates a user assignment</font></span></li></ul><ul type="disc" class="whs13"><div class="whs14"><span style="font-family: arial, sans-serif; font-size: 10pt;"><span  style="font-weight: bold;"><font size=-1><b>N</span></b>ote:</span><span style="font-family: arial, sans-serif; font-size: 10pt;">Clicking on the underscored pin number will provide the pin layout diagramfor the highlighted pin.&nbsp;<!--kadov_tag{{<spaces>}}--><!--kadov_tag{{</spaces>}}-->Rollingyour mouse over the colored pin will pop up a tooltip with the signal nameassigned to the pin, the I/O standard,&nbsp;<!--kadov_tag{{<spaces>}}--><!--kadov_tag{{</spaces>}}-->theI/O style, the slew rate, and/or any constraints assigned to the pin:</font></span></div></ul><div class="whs15"><script LANGUAGE="JavaScript"><!--if (navigator.appName=="Netscape"){ document.write("<img src='pin.gif' x-maintain-ratio='TRUE' width='309' height='312' border='0'>");}else{ document.write("<img src='pin.gif' x-maintain-ratio='TRUE' style='border: none; width: 309px; height: 312px; float: none;' width='309' height='312' border='0'>");}//--></script></div><ul type="disc" class="whs16"><li class="kadov-p" class="kadov-p"><span style="font-family: arial, sans-serif; font-size: 10pt;"><font size=-1>Thepin type</font></span></li><li class="kadov-p" class="kadov-p"><span style="font-family: arial, sans-serif; font-size: 10pt;"><font size=-1>Thepin use&nbsp;</font></span></li><li class="kadov-p" class="kadov-p"><span style="font-family: arial, sans-serif; font-size: 10pt;"><font size=-1><i>XPLA3only</i> - The GCK (Global Clock Signal) mapping&nbsp;</font></span></li></ul><div class="whs17"><span style="font-weight: bold;											font-family: arial, sans-serif;											font-size: 10pt;"><font size=-1><b>Note:</span><span  style="font-family: arial, sans-serif; font-size: 10pt;"></b>Moving your mouse cursor over an "I" in the Pin Use column will displaythat input signal as a tooltip.</font></span></div><br><span style="font-family: arial, sans-serif; font-size: 10pt;"><br><span style="font-family: arial, sans-serif; font-size: 10pt;"><i>XBRonly</i> - Below the resource table there is another table listing the<b>Function Block Control Term</b> usage, the product term mapped to thecontrol term is listed. Clicking on the product term will bring up a pop-upwindow displaying that product term.<blockquote><li>CTC - control term clock</li><li>CTR - control term reset</li><li>CTS - control term set</li><li>CTE - control term output enable</li></blockquote><p><br><span style="font-family: arial, sans-serif; font-size: 10pt;"><font size=-1>Belowthis table you will find a list of signals used by logic in the functionblock you are viewing.&nbsp;<!--kadov_tag{{<spaces>}}--><!--kadov_tag{{</spaces>}}-->Thelist displays output signals as links.&nbsp;<!--kadov_tag{{<spaces>}}--><!--kadov_tag{{</spaces>}}-->Clickingon an output signal link will open a new window showing the equations forthat signal.</font></span><!--begin!kadov{{--><br><!--}}end!kadov--><!--kadov_tag{{<implicit_p>}}--><p class="whs18"><span style="font-family: arial, sans-serif;											font-size: 10pt;											font-weight: bold;"><font size=-1><b>Note:</span><span  style="font-family: arial, sans-serif; font-size: 10pt;"><!--kadov_tag{{<spaces>}}--><!--kadov_tag{{</spaces>}}--></b>Thereis also a&nbsp;<script LANGUAGE="JavaScript"><!--if (navigator.appName=="Netscape"){ document.write("<img src='legend.gif' x-maintain-ratio='TRUE' width='68' height='28' border='0'>");}else{ document.write("<img src='legend.gif' x-maintain-ratio='TRUE' style='border: none; width: 68px; height: 28px; float: none;' width='68' height='28' border='0'>");}//--></script>buttonbelow the table.&nbsp;<!--kadov_tag{{<spaces>}}--><!--kadov_tag{{</spaces>}}-->Clickthis button to open a new window describing all of the acronyms used inthe function block table.&nbsp;<!--kadov_tag{{<spaces>}}--><!--kadov_tag{{</spaces>}}-->Youcan select either brief descriptions or more detailed descriptions by clickingthe "Verbose" button at the top of the window.</font></span><h4 class="whs19"><a NAME="view"></a>The View</h4><div class="whs20">When you click on the&nbsp;<script LANGUAGE="JavaScript"><!--if (navigator.appName=="Netscape"){ document.write("<img src='view.gif' x-maintain-ratio='TRUE' width='61' height='53' border='0'>");}else{ document.write("<img src='view.gif' x-maintain-ratio='TRUE' style='border: none; width: 61px; height: 53px; float: none;' width='61' height='53' border='0'>");}//--></script>buttonabove the table, a new window will open with a graphical display of thefunction block you are examining.&nbsp;<!--kadov_tag{{<spaces>}}--><!--kadov_tag{{</spaces>}}-->Thepins are all color-coded: input pins are green, output pins are blue, andclocks are magenta:</div><p class="whs21"><script LANGUAGE="JavaScript"><!--if (navigator.appName=="Netscape"){ document.write("<img src='fb1.gif' x-maintain-ratio='TRUE' width='482' height='378' border='0'>");}else{ document.write("<img src='fb1.gif' x-maintain-ratio='TRUE' style='border: none; width: 482px; height: 378px; float: none;' width='482' height='378' border='0'>");}//--></script><p class="whs22">Right-click anywhere within the window to pull up a menuthat allows you to zoom in or out for easier viewing.&nbsp;<!--kadov_tag{{<spaces>}}--><!--kadov_tag{{</spaces>}}--><p class="whs23">This menu also allows you choose to see all of the inputconnections, all of the output connections, or both at once.&nbsp;<!--kadov_tag{{<spaces>}}--><!--kadov_tag{{</spaces>}}-->Likethe pins, the signals are color-coded: inputs are red, outputs are yellow,and macrocell connections are aqua:<p class="whs24"><script LANGUAGE="JavaScript"><!--if (navigator.appName=="Netscape"){ document.write("<img src='fb.gif' x-maintain-ratio='TRUE' width='497' height='377' border='0'>");}else{ document.write("<img src='fb.gif' x-maintain-ratio='TRUE' style='border: none; width: 497px; height: 377px; float: none;' width='497' height='377' border='0'>");}//--></script><p class="whs25">To examine the signals of single pins, simply click thepin whose signals you wish to see.&nbsp;<!--kadov_tag{{<spaces>}}--><!--kadov_tag{{</spaces>}}-->Toexamine multiple pins without having to see everything at once, hold downthe control key while you click the pins you want to view.<p class="whs26">To view the signals for individual macrocells:<ul type="disc" class="whs27"><div class="whs28">Click the inside edge of the macrocell to display itsmacrocell connections and inputs.</div><p class="whs29">Click the outer edge to display its output signals<p class="whs30">Click in the center to display everything<p class="whs31">Double click in the center to open a new window with adetailed macrocell diagram</ul><div class="whs32"></div></body></html>

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