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[Discuss-gnuradio] Re: USB FIFO

From: Brian Padalino
Subject: [Discuss-gnuradio] Re: USB FIFO
Date: Thu, 29 Mar 2007 16:47:19 -0400

On 3/29/07, Thibaud Hottelier <address@hidden> wrote:
My idea was that the process in the fpga that read usb_bus can store the
packet and the total length is reached, ignore the data coming because
we know its padding. That process is the first process in the wiki page
(http://gnuradio.org/trac/wiki/UsrpTxModifications). This way we don't
need a dual clock fifo that can skip, only a single clock one.

We need a dual clocked FIFO just because the FX2 is running on a
different clock domain than the FPGA.  The FPGA runs at 64MHz whereas
the FX2 runs at something like 24MHz I believe.  Because these clocks
know nothing about each other - their domains need a nice handoff
point like that dual clocked FIFO.

For a handy reference:

If you don't understand, we'll have to talk it over some more.  It's a
good concept to understand and surely will help in the future.


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