Can someone explain the origin or history of the term 'derived clock'?

I am interested in knowing the origin or history of the term 'derived clock' as it applies to FPGA programming. See the link below.
https://decibel.ni.com/content/docs/DOC-3003
Thank you.

A derived clock is nothing more than a clock you created (derived) from a real hardware clock. This is done by multiplying and/or dividing the base clock.
This is needed for some applications to make some segments work faster/slower than what the base clock will allow, usually with signal processing.
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Can someone explain how data is fed to the usage details screen in My Verizon?

Can someone explain to me how I can view my data usage for a past date today and when I look at the same date a few days from now there will be additional data. Customer support were adamant that the data usage details come directly from my device so I commented that my device must be saving usage and sending it to Verizon arbitrarily to which I was met with silence on the line.
Here's an example - on 4/1 I checked my data usage details for the date of 3/21 and it looked like this:
03/21/12
08:43:00 PM
0.02518
03/21/12
09:17:00 AM
0.01475
03/21/12
07:20:00 AM
0.01730
then on 4/7 when I checked my data usage details for the date 3/21 it looked like this:
03/21/12
11:45:00 PM
1.15382
03/21/12
11:38:00 PM
0.24853
03/21/12
08:43:00 PM
0.02518
03/21/12
07:50:00 PM
1.03191
03/21/12
06:55:00 PM
1.18499
03/21/12
06:10:00 PM
1.03968
03/21/12
09:17:00 AM
0.01475
03/21/12
07:20:00 AM
0.01730
The red rows have been added between 4/1 & 4/7, but where did they come from? This is just one example, it's happening all over my bill and Verizon cannot justify the anomaly and certainly won't consider removing the $40 in overage charges I have this month. Which brings up another question, why doesn't Verizon offer more than 10GB for the mifi? If I want to use more data and am willing to pay for it, I have to go to another provider?

Hi kellieh,
When you had your data overage (and the additional spurious charges), how did Verizon respond to you?
I have just reported a 2x discrepancy between individual device data usage (.89 GB total) and the reported 1.5 GB for my account. They claim it will take 72 hours to get back to me after they research the problem.
What avenues did you pursue to make contact?
I caled 611, then emailed tech support, then sent a private message to Verizon Wireless support.

Can someone explain what Apple did to remedy the battery life in version 1?

My original post got deleted...i guess it violated the TOS for "ranting" and "speculation".
Yes, the 3g iPhone is an amazing piece of technology with MANY features....but I simply cannot use them and expect it to be a dependable functional telephone at the same time. For years, I have had phones that remain on standby possibly for days, make lots of calls, do lots of texting, browse the net...etc...you get the point.
I purchased the iphone for the push feature, the 3G feature, the wifi feature and the ability to use it as a telephone ......dependably. I work on-call and need to have a phone on at all times day or night. I charge my phones overnight but still have NEVER had a phone lose a charge as quickly as the iPhone does.
Apple's solution right now is to turn off all the features that make the phone so attractive in the first place.
I suspect that I am like a lot of others in that I did not buy this PHONE (yes, it is a phone after all and should have adequate battery life to serve as a phone) to selectively and actively take the time in between calling, browsing, etc. to remember to turn wifi on and off, turn my 3G network on and off and then manually push email. This kind of defeats the purpose.
Is there something Apple can do to remedy this situation via software updates or are some of has hoping for a pipe dream that simply will/cannot happen? I know with the first iPhone there were updates that dealt with battery life. Does anybody know what the formaer updates did physically? I hope something can be done with the 3g version, because right now it is not usable and may need to be returned.
Any software/hardware engineer types out there who can advise if this is indeed a fixable thing or should I return the phone? I REALLY REALLY REALLY want to keep this thing, but as it is now, it is totally not usable for me.
Thanks for reading. . . .hope there is a solution!
(hope this isn't "too speculative" to be tossed again for violating the TOS)
Message was edited by: Woostiwa2

I suspect this is your first 3G phone and if so, this is a common problem with all 3G phones and a big complaint. Other 3G phones have a swappable battery which having is a requirement. Since the iPhone does not have a swappable battery, an extra wall charger or keeping the wall charger handy is required. Or having a computer nearby with a USB port along with having a vehicle charger.
If you aren't interested in turning off available features to conserve battery when needed or wanted, and you use your iPhone regulary for web and email account access via 3G, the battery won't last the day - which is the same for any 3G smart phone. With no swappable battery, if the other alternatives are not acceptable, you should return it.

Can someone explain why one code works and the other one doesn't?

Hi,
I have been doing a little work with XML today and I wrote the following code which did not function properly. In short, it was as if there were elements in the NodeList that disappeared after the initial call to NodeList.getElementsByTagName("span"); The code completely drops through the for loop when I make a call to getTextContent, even though it is not a controlling variable and it does not throw an exception! I'm befuddled. The second portion of code works. For what it is worth, tidy is the HTML cleaner that's been ported to java (JTidy) and parseDOM(InputStream, OutputStream) is supposed to return a Document, which it does! So why I have to call a DocumentBuilderFactory and then get a DocumentBuilder is beyond me. If I don't call Node.getTextContent() the list is processed properly and calls to toString() indicate that the class nodes are in the list! Any help would be appreciated!
import com.boeing.ict.pdemo.io.NullOutputStream;
import java.io.File;
import java.io.FileInputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.PrintWriter;
import java.util.Properties;
import org.w3c.dom.Document;
import org.w3c.dom.NodeList;
import org.w3c.tidy.Tidy;
public class HTMLDocumentProcessor {
    // class fields
    private Properties tidyProperties   = null;
    private final String tidyConfigFile =
            "com/boeing/ict/pdemo/resources/TidyConfiguration.properties";
     * Creates a new instance of HTMLDocumentProcessor
    public HTMLDocumentProcessor() {
        initComponents();
    private void initComponents() {
        try {
            tidyProperties = new Properties();
            tidyProperties.load(ClassLoader.getSystemResourceAsStream(tidyConfigFile));
        } catch (IOException ignore) {
    public Document cleanPage(InputStream docStream) throws IOException {
        Document doc = null;
        NullOutputStream nos = new NullOutputStream(); // A NullOutputStream is
                                                       // is used to keep all the
                                                       // error output from printing
        // check to see if we were successful at loading properties
        if (tidyProperties.isEmpty()) {
            System.err.println("Unable to load configuration file for Tidy");
            System.err.println("Proceeding with default configuration");
        Tidy tidy = new Tidy();
        // set some local, non-destructive settings
        tidy.setQuiet(true);
        tidy.setErrout(new PrintWriter(nos));
        tidy.setConfigurationFromProps(tidyProperties);
        doc = tidy.parseDOM(docStream, nos);
        // assuming everything has gone ok, we return the root element
        return doc;
    public static void main(String[] args) {
        try {
            String fileName = "C:/tmp/metars-search.htm";
            File htmlFile = new File(fileName);
            if (!htmlFile.exists()) {
                System.err.println("File : " + fileName + " does not exist for reading");
                System.exit(0);
            FileInputStream fis = new FileInputStream(htmlFile);
            HTMLDocumentProcessor processor = new HTMLDocumentProcessor();
            Document doc = processor.cleanPage(fis);
            if (doc == null) {
               System.out.println("cleanPage(InputStream) returned null Document");
               System.exit(0);
            NodeList spanTags = doc.getElementsByTagName("span");
            int numSpanTags = spanTags.getLength();
            System.out.println("Number of <span> tags = " + numSpanTags);
            for (int i = 0; i < numSpanTags; i++) { // Loop falls through here!
                System.out.println("Span tag (" + i + ") = " +
                                    spanTags.item(i).getTextContent());
        } catch (Exception e) {
            e.printStackTrace();
        } finally {
            System.exit(0);
}This segment of code works!
import com.boeing.ict.pdemo.io.NullOutputStream;
import java.io.ByteArrayInputStream;
import java.io.ByteArrayOutputStream;
import java.io.File;
import java.io.FileInputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.PrintWriter;
import java.util.Properties;
import javax.xml.parsers.DocumentBuilder;
import javax.xml.parsers.DocumentBuilderFactory;
import javax.xml.parsers.ParserConfigurationException;
import org.w3c.dom.Document;
import org.w3c.dom.NodeList;
import org.w3c.tidy.Tidy;
import org.xml.sax.SAXException;
* Class designed to remove specific notam entries from the
* HTML document returned in a request. The document will contain
* either formatted (HTML with CSS) or raw (HTML, pre tags). The
* Formatted HTML will extract the paragraph body information from the
* document in it's formatted state. The raw format will extract data
* as simple lines of text.
* @author John M. Resler (Capt. USAF, Ret.)<br/>
* Class : NotamExtractor<br/>
* Compiler : Sun J2SE version 1.5.0_06<br/>
* Date : June 15, 2006<br/>
* Time : 11:05 AM<br/>
public class HTMLDocumentProcessor {
    // class fields
    private Properties tidyProperties   = null;
    private final String tidyConfigFile =
            "com/boeing/ict/pdemo/resources/TidyConfiguration.properties";
     * Creates a new instance of HTMLDocumentProcessor
    public HTMLDocumentProcessor() {
        initComponents();
    private void initComponents() {
        try {
            tidyProperties = new Properties();
            tidyProperties.load(ClassLoader.getSystemResourceAsStream(tidyConfigFile));
        } catch (IOException ignore) {
    public Document cleanPage(InputStream docStream) throws IOException {
        Document doc = null;
        NullOutputStream nos = new NullOutputStream(); // A NullOutputStream is
                                                       // is used to keep all the
                                                       // error output from printing
        ByteArrayOutputStream bos = new ByteArrayOutputStream();
        // check to see if we were successful at loading properties
        if (tidyProperties.isEmpty()) {
            System.err.println("Unable to load configuration file for Tidy");
            System.err.println("Proceeding with default configuration");
        Tidy tidy = new Tidy();
        // set some local, non-destructive settings
        tidy.setQuiet(true);
        tidy.setErrout(new PrintWriter(nos));
        tidy.setConfigurationFromProps(tidyProperties);
        doc = tidy.parseDOM(docStream, bos);
        DocumentBuilderFactory docFactory = DocumentBuilderFactory.newInstance();
        DocumentBuilder docBuilder = null;
        try {
            docBuilder = docFactory.newDocumentBuilder();
        } catch (ParserConfigurationException ex) {
            ex.printStackTrace();
        try {
            doc = docBuilder.parse(new ByteArrayInputStream(bos.toByteArray()));
        } catch (IOException ex) {
            ex.printStackTrace();
        } catch (SAXException ex) {
            ex.printStackTrace();
        // assuming everything has gone ok, we return the root element
        return doc;
    public static void main(String[] args) {
        try {
            String fileName = "C:/tmp/metars-search.htm";
            File htmlFile = new File(fileName);
            if (!htmlFile.exists()) {
                System.err.println("File : " + fileName + " does not exist for reading");
                System.exit(0);
            FileInputStream fis = new FileInputStream(htmlFile);
            HTMLDocumentProcessor processor = new HTMLDocumentProcessor();
            Document doc = processor.cleanPage(fis);
            if (doc == null) {
               System.out.println("cleanPage(InputStream) returned null Document");
               System.exit(0);
            NodeList spanTags = doc.getElementsByTagName("span");
            int numSpanTags = spanTags.getLength();
            for (int i = 0; i < numSpanTags; i++ ) {
                System.out.println(spanTags.item(i).getTextContent().trim());
        } catch (Exception e) {
            e.printStackTrace();
        } finally {
            System.exit(0);
}

Thank you Dr but the following is true:
I placed this code in the for loop before I posted the question :
for (int i = 0; i < numSpanTags; i++) { // Loop falls through here!
      System.out.println("Span tag (" + i + ") = " + spanTags.item(i));
}And I receive 29 (The correct number) of non-null references to objects (Node objects) in the NodeList.
When I replace the exact same for loop with this code :
for (int i = 0; i < numSpanTags; i++) { // Loop falls through here!
      System.out.println("Span tag (" + i + ") = " + spanTags.item(i).getTextContent());
}Nothing prints. This discussion has never been about "clever means to suppress exceptions" it has been precisely about why a loop that has the
exact same references, exact same indices prints one time and doesn't print the other and does not throw an exception. If you can answer
that question then I am interested. I am not interested in pursuing avenues that are incorrect, not understood and most importantly shot from the hip without much thought.

Can someone explain how "Hybrid Power" works on the GT70?

I have had my GT70 20C for a couple months now and have yet to see Hybrid Power working once. I have been playing games that are clearly taxing my system to the max (SC Blacklist and Rome 2) but the Hybrid Power monitor always says "OFF".
Am i missing something obvious? I've tried searching the forums and Internet and it seems others are having the same issue, but i'm having trouble tracking down an answer.
It is my understanding that Hybrid Power only kicks in when it needs too, but it doesn't seem to be doing that at all.
Is there a way to force it on?
Can anyone shed some light on how this feature is supposed to work?
cheers,
-deluxxe

same question same computer. Hybrid power is a application but it already runs hidden on your laptop. I always play on my laptop with the charger connected. never on battery. I get about 40-80 frames on ultra on bf3 without the AA or Sync. One day I forgot to check if the outlet was on, and I noticed that my laptop was "struggling" to run the same setting I always run. I quickly checked if I was in "gaming" mode for the G settings and the windows 8 battery settings. I was and started getting worried that something happened to my laptops GPU. I started checking what was running on task manager, using cc cleaner to see and new start-up programs running, checked to see if the disk was in use or if that automatic maintenance was occurring since I have everything always running smooth. nothing was running expect the normal. I then realized that I was running on battery. I remembered that this hybrid energy thing only worked on if you have it plugged in and charging because somewhere I read said that the battery wouldn't be able to "Boost" the gpu or overclock or whatever they want to call it. Running on battery wont boost the gpu because theres not enough watts going in. While charging it will boost the gpu. im not sure wether this is the case that it does overclock the gpu because it clearly says cpu on the hybrid application. And once you go on gaming mode the gigherts gets locked to 3.3 on the cpu speed. its all confusing to me and im still trying to figure it out but all I know for sure is that you will gain a very big boost on ur speed or performance on ur gpu when you have it connected to the charger and charging. I tested it out by unplugging and pluging while play minecraft with a shaders mod(which really takes up a lot of GPU) and bf3 and arma. and yes, when on battery u have to lower ur settings to getting decent frames, while charging or plugged in you get to pretty much maximize your settings. I went from 60 frames on arma3 to 20-30 frames on battery. how sad that you must always be connected to get that good boost and fps. im not sure wether this is a good since only msi does this and it really its overclocking your gpu, or if 770m is always runs that good and msi just saves you battery when gaming on battery. im not sure but if it really is helping out my gaming then that hybrid power is really good becausae that boost in frames is like a never go back type of thing. always game with turbo fan on and plugged in and charging

Please can someone explain how to delete email addresses? I have people who when I type in their name it comes up with the correct email address but then when you hit return to confirm it promptly changes the name to someone else (always the same someone

Please can someone explain how to delete and email address that when typed in brings up one name but when you hit return to confirm it jumps to another name. I can't find them in my contacts list but they do come up when you type the first few letters of a name.
EG If I type xyz and the name of the person comes up, when I press return to confirm that's the one I want then it jumps to [email protected], always the same def address.
I can't fathom it out.
Thanks
Terri

Try this:
Start a new email. In the To address bar, type in xyz like you normally do, press return to confim, and when the address you want to remove shows up in the address bar, move your cursor over the address you want to delete.
A small triangle next to the name will show up. click on it, a drop down menu will open, click Remove from Previous Recipients List. Then do the drop down menu again and Remove Address.
Good luck.

I cannot find a way to sort the bookmark folders themselves alphabetically by name.I am not talking about in a view mode but in the way they are displayed when I click on my bookmarks tab. Can someone explain to me how to accomplish this.

I have a lot of various book mark folders with websites contained within each folder. I am able to sort the websites within each folder alphabetically by name but I cannot find a way to sort the bookmark folders themselves alphabetically by name.I am not talking about in a view mode but in the way they are displayed when I click on my bookmarks tab. Can someone explain to me how to accomplish this other than manually dragging them as this is extremely hard for me due to the fact that I am a quadriplegic with limited hand movement dexterity

Bookmark folders that you created are in the Bookmarks Menu folder. "Sort" that folder.
http://kb.mozillazine.org/Sorting_bookmarks_alphabetically

I need to download all of my photos from my iPhone 4S and my iPad 2 to my MacBook Air. I want to make sure all my photos are not lost and that they do not return to the original devices because of the cloud. Can someone please help ?

I need to download all of my photos from my iPhone 4S and my iPad 2 to my MacBook Air because there is no more storage space available. I want to make sure all my photos are not lost and that they do not return to the original devices because of the cloud. Can someone please help ?

Connect your devices to the computer with the USB cable (one device at a time) and import the photos via iPhoto or Image Capture.
If you have not changed any default settings on your computer, iPhoto will automatically launch when you plug in the device. Then follow the import prompts.

CAN SOMEONE EXPLAIN ME THE DISPLAY QUALITY

I have just purchased a new macbook pro 15" 2.4ghz. Im a designer, i havent even created my appleid, im on my sisters... i made a sacrifice to buy this $2700 laptop.
and Im so dissapointed...
I CANT SEE SMOOTH GRADIENTS.. all i see are ugly lines... i dont get it, for such a high class LAPTOP.
Apple support please help me solve this. ive been reading forums about 6bit screens for this laptop.. i dont want to believe that. can someone explain? im returning this...

I can verify that all of Apple's laptops use 18 bit (6 bits per Red, Green Blue) color, which is about 260,000 colors. The OS then using dithering to fake the missing colors. Despite what you have read, they are incapable of 24 bit 'millions of colors'.
The problem with this argument is that, when it comes down to it, the color displays are made up of dithered red, green, and blue elements anyway. We accept that this form of display gives us "full color", so it's difficult to argue that millions of colors can't be represented using the same mechanism. It's not quite 16.7 million (more like 16.3 or something) but Apple's text has always taken care to read "millions of colors" rather than 16.7 million (which you'll still see on the specifications for the Cinema displays).
Just for informational sakes though, these kinds of 6-bit displays don't rely on OS spatial dithering; they actually make use of their very fast switching to perform temporal dithering, switching a pixel between two shades very quickly to generate an in-between shade. That's why for most people the result is usually visually indistinguishable from true 8-bit color, and doesn't look like what you'd see with traditional dithering.
If the OP is noticing severe banding on gradients, it's more likely to be an issue with color profiles than with the display being 6-bit.

Can someone explain the use of a hashtable in java?

can someone explain the use of a hashtable in java?

Hashtable allows us to store values along with keys.
One other advantage is, it provides Synchronised methods.
Hope you got it.

Can Someone Explain the order of things Using Swingworker?

Hi:
Can someone explain very clearly the order of things using Swingworker? Please do not refer the SUN tutorials. I am totally dead in the water with a very large application and the order of things is not sensible. Also, if the worker thread is too long, the GUI gets updated, but my progress bar (killed right after in the finished method) remains running in some instances only.
Can someone explain any debugging methods for thread work?
I am a veteran programmer of 19 years and this one's got me. The event dispatch thread returns immediate, the GUI responds well, but the progress bar setVisible(false); ... just after in the finished() method (on Event Dispatch thread) does not go away, continues running, only on very long (large query) work. I'm truly stumped. I have successful applications of the Swingworker use, the progress bar, and everything works fine. Not this one.
Debugging threads is what I need. Or some tool that visually shows threads as the program runs.
Thanks for any help,
PiratePete

Thanks. I guess I should count my blessings when using free stuff. But I have been impressed with what the J2SDK has to offer. I have been writing a complicated application that I am going to market and most of my problems have been "design" in nature.
Thanks again,
PiratePete

Can someone explain the hyperthreading settings in cmos (the 4x,5x, etc.)?

Someone once said admitting you don't know something is the first step on the road to knowledge....or something like that
Can someone explain the hyperthreading setting in the CMOS Setup - mine is set to 5x, which I think is correct for my cpu - Venice 3500+, but I don't really know what it does. What does that setting affect? I think it was 4x by default, until I loaded optimal settings, and it went to 5x.....

HT = Hyper Transport
Q: What is HyperTransport™ technology?
A: HyperTransport™ technology is a new high speed, high performance point-to-point link for interconnecting integrated circuits on a motherboard. It can be significantly faster than a PCI bus for an equivalent number of pins. HyperTransport was previously codenamed Lightning Data Transport, or LDT. HyperTransport technology was invented by AMD and perfected with the help of several partners throughout the industry. It is primarily targeted for the IT and Telecomm industries, but any application where high speed, low latency and scalability is necessary can potentially take advantage of HyperTransport technology. HyperTransport technology was invented in order to unleash the tremendous power of the AMD microprocessors. HyperTransport is planned to bring the computation experience to a new level.
Hyperthreading Technology used by Intel.

Can someone explain the code for having the Accordion panels closed?

I located the answer to my own question (how to get all the accordion panels to remain closed when the browser opens) but I still don't understand the answer. Can someone explain this?
This feature is only supported when using variable height panels, so you must pass a false into the Accordion's constructor for the "useFixedPanelHeights" constructor options, and a -1 for the "defaultPanel" option:
<script type="test/javascript">
var acc1 = new Spry.Widget.Accordion ("Acc1", { useFixPanelHeights: false, defaultPanel: -1});
</script>
Angela

GPDMTR25 wrote:
I located the answer to my own question (how to get all the accordion panels to remain closed when the browser opens) but I still don't understand the answer. Can someone explain this?
This feature is only supported when using variable height panels, so you must pass a false into the Accordion's constructor for the "useFixedPanelHeights" constructor options, and a -1 for the "defaultPanel" option:
<script type="test/javascript">
var acc1 = new Spry.Widget.Accordion ("Acc1", { useFixPanelHeights: false, defaultPanel: -1});
</script>
Angela
Hi Angela,
You are right, the only way it will work is by setting the fixed height to false. As for the for the default panel option, -1 is not a panel and if you had 3 panels we could have used the number 3 (panel1 = 0) or 99 or whatever as long as there is no panel with that number. If we had used the number 1 for instance, then the 2nd panel would be opened by default.
Hope this helps.
Ben

I have downloaded ios 5.1.1 and the wifi has stop working or it would stay on for less then 20min its only 9 months old can someone explain what is happening and if some know how to fix it

I have downloaded ios 5.1.1 and the wifi has stop working or it would stay on for less then 20min its only 9 months old can someone explain what is happening and if some know how to fix it

I have taken it back to the Apple store genius bar, but they say they don't see anything wrong. Well unless you use it all day and experience the problems when they happen, you wont see anything wrong. But there are lots wrong with it. But this would be the same store as I purchased the phone. And they backed up my old Iphone 4, but were not able to get anything to load back onto my new phone. So, I lost pretty much everything. But over time, some of my contacts have started showing up, although i am still missing over 800 of them.

Can someone explain the difference between width, maxWidth, explicitWidth, explicitMaxWidth?

Can someone explain the difference between width, maxWidth, explicitWidth, explicitMaxWidth of the UI component? I read the API and I have no idea what do they mean.

Width is the current width. ExplicitWidth is set if you give an component
an explicit width vs a temporary width via setActualSize.
MaxWidth and minWidth factor in either the measuredMax/MinWidth or one set
explicitly.

Can someone explain the origin or history of the term 'derived clock'?

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