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Re: GA144 Application Board

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On Wednesday, March 21, 2012 12:13:23 PM UTC-7, rickman wrote:
> I read that someone at GA (may have been Chuck) had a 10 MHz crystal
> ringing in the lab, but it was far from what I would consider a
> crystal oscillator.  I think it might be practical to get a 32 kHz
> crystal to resonate, but I think MHz frequencies are just too high to
> be practical.  When I tried to discuss this in a non-forth forum some
> real experts in oscillators didn't even know how to approach it.  In
> other words, no one knew how to analyze it.  So how could the
> stability and operation over temperature, etc be predicted?

I looked at this once and decided the I/O structure wasn't really sufficient to run a crystal oscillator with one pin. The problem is that you need to bias the pin near its switching point to decide which side of the voltage swing you're on.

Maybe a node could be programmed as an inverter with two pins and you'd have a feedback resistor like a typical oscillator.
>
> Isn't 4 GB a bit much?  PDA's, tablets and cell phones don't have that
> much memory!  Geeze, this PC I am typing on only has 4 GB!!!  The idea
> of scrounging PC's at the dump for memory is a bit funny.  I think a
> $4 SRAM or SDRAM chip will do the job ok.
> 
Mobile SDR SDRAM would be easiest to use. Not DDR2 or DDR3. There is no PLL in the SDR parts so the clock doesn't have to be a fixed period, or any minimum period as long as times are met. These parts don't have the PC market pushing down their prices, but they will be around for a long time. They also come in small sizes like 16Mb (2M byte).

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GA144 Application Board rickman <gnuarm@gmail.com> - 2012-03-10 17:24 -0800
  Re: GA144 Application Board Rafael Deliano <Rafael_Deliano@arcor.de> - 2012-03-11 10:10 +0100
    Re: GA144 Application Board rickman <gnuarm@gmail.com> - 2012-03-11 04:33 -0700
      Re: GA144 Application Board emmanuel <emmanuel.said@cern.ch> - 2012-03-11 06:00 -0700
        Re: GA144 Application Board rickman <gnuarm@gmail.com> - 2012-03-11 19:41 -0700
      Re: GA144 Application Board Rafael Deliano <Rafael_Deliano@arcor.de> - 2012-03-11 16:03 +0100
        Re: GA144 Application Board rickman <gnuarm@gmail.com> - 2012-03-11 13:45 -0700
  Re: GA144 Application Board Jecel <jecel@merlintec.com> - 2012-03-11 12:33 -0700
  Re: GA144 Application Board Albert van der Horst <albert@spenarnc.xs4all.nl> - 2012-03-11 19:45 +0000
    Re: GA144 Application Board Matthias Koch <koch@pci.uni-hannover.de> - 2012-03-15 14:11 +0100
  Re: GA144 Application Board Paul Rubin <no.email@nospam.invalid> - 2012-03-14 19:53 -0700
    Re: GA144 Application Board rickman <gnuarm@gmail.com> - 2012-03-20 20:15 -0700
      Re: GA144 Application Board Albert van der Horst <albert@spenarnc.xs4all.nl> - 2012-03-21 13:08 +0000
        Re: GA144 Application Board rickman <gnuarm@gmail.com> - 2012-03-21 12:13 -0700
          Re: GA144 Application Board Albert van der Horst <albert@spenarnc.xs4all.nl> - 2012-03-22 11:36 +0000
            Re: GA144 Application Board Albert van der Horst <albert@spenarnc.xs4all.nl> - 2012-03-22 17:50 +0000
              Re: GA144 Application Board rickman <gnuarm@gmail.com> - 2012-03-22 14:50 -0700
                Re: GA144 Application Board Albert van der Horst <albert@spenarnc.xs4all.nl> - 2012-03-23 12:24 +0000
                Re: GA144 Application Board rickman <gnuarm@gmail.com> - 2012-03-23 10:11 -0700
                Re: GA144 Application Board Roger Ivie <rivie@ridgenet.net> - 2012-03-23 13:15 -0500
                Re: GA144 Application Board rickman <gnuarm@gmail.com> - 2012-03-24 11:51 -0700
                Re: GA144 Application Board Albert van der Horst <albert@spenarnc.xs4all.nl> - 2012-03-25 12:06 +0000
                Re: GA144 Application Board rickman <gnuarm@gmail.com> - 2012-03-25 12:50 -0700
                GA144 memory interfacing was Re: GA144 Application Board Albert van der Horst <albert@spenarnc.xs4all.nl> - 2012-03-26 13:00 +0000
                Re: GA144 memory interfacing was Re: GA144 Application Board rickman <gnuarm@gmail.com> - 2012-03-26 20:03 -0700
                Re: GA144 memory interfacing was Re: GA144 Application Board Albert van der Horst <albert@spenarnc.xs4all.nl> - 2012-03-28 12:21 +0000
                Re: GA144 memory interfacing was Re: GA144 Application Board Paul Rubin <no.email@nospam.invalid> - 2012-03-28 07:59 -0700
            Re: GA144 Application Board rickman <gnuarm@gmail.com> - 2012-03-22 14:26 -0700
          Re: GA144 Application Board hwfwguy@gmail.com - 2012-03-22 12:25 -0700
            Re: GA144 Application Board Paul Rubin <no.email@nospam.invalid> - 2012-03-22 13:07 -0700
              Re: GA144 Application Board rickman <gnuarm@gmail.com> - 2012-03-22 14:54 -0700
                Re: GA144 Application Board Paul Rubin <no.email@nospam.invalid> - 2012-03-22 15:00 -0700
                Re: GA144 Application Board rickman <gnuarm@gmail.com> - 2012-03-23 10:15 -0700
                Re: GA144 Application Board Paul Rubin <no.email@nospam.invalid> - 2012-03-23 17:32 -0700
                Re: GA144 Application Board rickman <gnuarm@gmail.com> - 2012-03-24 12:01 -0700
                Re: GA144 Application Board Jan Coombs <jan_2011-02@murray-microft.co.uk> - 2012-03-24 22:27 +0000
                Re: GA144 Application Board rickman <gnuarm@gmail.com> - 2012-03-24 19:13 -0700
                Re: GA144 Application Board Paul Rubin <no.email@nospam.invalid> - 2012-03-24 16:01 -0700
                Re: GA144 Application Board rickman <gnuarm@gmail.com> - 2012-03-24 19:18 -0700
                Re: GA144 Application Board Paul Rubin <no.email@nospam.invalid> - 2012-03-25 13:06 -0700
                Re: GA144 Application Board rickman <gnuarm@gmail.com> - 2012-03-25 15:02 -0700
                Re: GA144 Application Board Paul Rubin <no.email@nospam.invalid> - 2012-03-25 15:51 -0700
                Re: GA144 Application Board rickman <gnuarm@gmail.com> - 2012-03-25 16:38 -0700
            Re: GA144 Application Board Richard Owlett <rowlett@pcnetinc.com> - 2012-03-22 16:54 -0500
              Re: GA144 Application Board rickman <gnuarm@gmail.com> - 2012-03-23 10:17 -0700
            Re: GA144 Application Board rickman <gnuarm@gmail.com> - 2012-03-22 14:52 -0700
            Re: GA144 Application Board Albert van der Horst <albert@spenarnc.xs4all.nl> - 2012-03-23 12:34 +0000
              Re: GA144 Application Board rickman <gnuarm@gmail.com> - 2012-03-23 10:24 -0700
            Re: GA144 Application Board Albert van der Horst <albert@spenarnc.xs4all.nl> - 2012-03-23 14:22 +0000
      Re: GA144 Application Board Paul Rubin <no.email@nospam.invalid> - 2012-03-22 08:12 -0700
        Re: GA144 Application Board Albert van der Horst <albert@spenarnc.xs4all.nl> - 2012-03-23 12:38 +0000
      Re: GA144 Application Board Paul Rubin <no.email@nospam.invalid> - 2012-03-22 08:52 -0700
        Re: GA144 Application Board rickman <gnuarm@gmail.com> - 2012-03-22 15:00 -0700
  Time to revisit S100 Bus? - was [Re: GA144 Application Board] Richard Owlett <rowlett@pcnetinc.com> - 2012-03-22 20:17 -0500
    Re: Time to revisit S100 Bus? - was [Re: GA144 Application Board] rickman <gnuarm@gmail.com> - 2012-03-23 10:29 -0700

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