Date: Thu, 03 Mar 2011 09:27:36 -0700
From: Dennis Muhlestein <[email protected]>
Subject: Re: [Fx2lib-devel] Change sync delay macro (Daniel O'Connor)
To: fx2lib developer mailing list <[email protected]>
Message-ID: <[email protected]>
Content-Type: text/plain; charset=ISO-8859-1; format=flowed
>
> To be honest, after using the GPIF designer a few times I was sorely tempted
> to
>write a bunch of macros to generate the GPIF data words :-/
>
After using the gpif a bit, my impression was that everyone switched to
slave fifo :).
...
So, to make along story short: Slave fifo solved the issue.
>
>GPIF is used when the peripheral interface bus needs to be mastered. I have
>not
>come across a better programmable parallel bus interface implementation than
>GPIF for bus mastering. It is true that GPIF adds an additional layer on top
>of
>the Slave FIFO interface, and in doing so has more limitations. These
>limiations are rarely a show-stopper. When these limitations are hit,
>they're usually because the peripheral is already a bus master. Flowstate is
>an
>additional layer on top of GPIF, and in my opinion is only useful for UDMA
>intefacing. Flowstate sounds cool, attracts EVERYONE - just pulls them right
>in, and 99% of the time is not a good fit to solve other interfacing needs,
>again this is my opinion. Tip: Only use Flowstate for UDMA interfacing.
>I've
>designed peripheral interfaces with GPIF and Slave FIFO on and off for more
>than
>a decade now, and have never failed to provide a fully functional interface.
>Please feel free to ping me if you ever need help with GPIF and / or Slave
>FIFO.
>
>
>P.S. I use the older GPIFTool utility :)
------------------------------------------------------------------------------
What You Don't Know About Data Connectivity CAN Hurt You
This paper provides an overview of data connectivity, details
its effect on application quality, and explores various alternative
solutions. http://p.sf.net/sfu/progress-d2d
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