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Re: [Discuss-gnuradio] USRP packet parsing

From: Brian Padalino
Subject: Re: [Discuss-gnuradio] USRP packet parsing
Date: Mon, 26 Mar 2007 15:56:34 -0400

On 3/26/07, Thibaud Hottelier <address@hidden> wrote:
I updated the wiki page
(http://gnuradio.org/trac/wiki/UsrpTxModifications) again, added the
command block FSM and renamed the fifos as Eric proposed. If nobody see
any major problem, I can start to implement these modifications by
working on the tx_usb_block.

Looks cool to me.

Here is what I think that could become an issue:

- The data_bus (used to transfer data between blocks) is 32 bits wide
which might be an overfill.

32-bits should be OK.  What problems do you think you may have an issue with?

- I don't do know how hard it is to add the "skip" functionality to the
Altera Fifo.

You will probably have to create your own FIFO from the lopsided RAM.
I don't think there is a way to infer a RAM where side A is a
different size than B.  The skip functionality is pretty straight
forward, and you probably just need empty and full flags.  That
shouldn't be difficult.

Is Quartus Web Edition able to run simulation like ModelSim? It looks
like it can but it wants the inputs to be defined in Vector Wave File
whereas I would rather generate them using my own testing blocks. I
would like to start by writing some testing blocks for the tx_usb_block.

They have a version of ModelSim you can download and use the Altera
blocks all for free.  I'd recommend just using that and not going
through the Altera tool.  Write a normal testbench and test out that


If you need me to verify any results or help with any of your coding,
just ask.  I have ModelSim along with the Altera tools available to


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