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Altera_Forum
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19 years ago

Edge Capture

I'm using PIO cores to change informations among processors. When I send some data from a cpu A to a cpu B, A also sends a flag signal to B. In B, its input PIO (which receives that signal) is sensitive to either rising or falling edge. However, every time A sends data to B, it needs to toggle the value of flag (between 0 and 1) in order to B capture some edge.

I'd like to avoid these "toggles" (my application has 4 flags till now). Is there some another way (another PIO resource) to give notice B that a new data is avaliable to it?

Another thing: If I use intensively internal Pio Cores can I have problems with the Watchdog time? Which ones? (As far I can see the pio cores use the Avalon Switch Fabric.)

Thanks people!!!

2 Replies

  • Altera_Forum's avatar
    Altera_Forum
    Icon for Honored Contributor rankHonored Contributor
    19 years ago

    --- Quote Start ---

    originally posted by mendonca@May 30 2006, 08:18 PM

    i'm using pio cores to change informations among processors. when i send some data from a cpu a to a cpu b, a also sends a flag signal to b. in b, its input pio (which receives that signal) is sensitive to either rising or falling edge. however, every time a sends data to b, it needs to toggle the value of flag (between 0 and 1) in order to b capture some edge.

    i'd like to avoid these "toggles" (my application has 4 flags till now). is there some another way (another pio resource) to give notice b that a new data is avaliable to it?

    <div align='right'><{post_snapback}> (index.php?act=findpost&pid=15695)

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    When you mean "sensitive to either rising or falling edge" you mean you&#39;ll raise a remote interrupt for every data you are sending to the other CPU?

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    originally posted by mendonca@May 30 2006, 08:18 PM

    another thing: if i use intensively internal pio cores can i have problems with the watchdog time? which ones? (as far i can see the pio cores use the avalon switch fabric.)

    <div align='right'><{post_snapback}> (index.php?act=findpost&pid=15695)

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    I don&#39;t think you&#39;ll have such problems... the Avalon is basically a crossbar switch!

    bye

    Paolo
  • Altera_Forum's avatar
    Altera_Forum
    Icon for Honored Contributor rankHonored Contributor
    19 years ago

    --- Quote Start ---

    originally posted by paolo.gai@Jun 3 2006, 05:24 PM

    when you mean "sensitive to either rising or falling edge" you mean you&#39;ll raise a remote interrupt for every data you are sending to the other cpu?

    <div align='right'><{post_snapback}> (index.php?act=findpost&pid=15695)

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    Yes. Every time I send data (a new data) to another cpu, this one may be warned. I&#39;ll run a iterative algorithm on the system.

    --- Quote Start ---

    originally posted by paolo.gai@Jun 3 2006, 05:24 PM

    i don&#39;t think you&#39;ll have such problems... the avalon is basically a crossbar switch!

    <div align='right'><{post_snapback}> (index.php?act=findpost&pid=15844)

    --- quote end ---

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    Thanks!