Re: [Discuss-gnuradio] USRP packet parsing

[Brian Padalino]

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
FIFO.

> Thibaud

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
me.

Brian