Re: [Discuss-gnuradio] USRP packet parsing

[Brian Padalino]

On 3/22/07, Thibaud Hottelier <address@hidden> wrote:
> Yes, I forgot that the packet are ordered by timestamps, which solved
> the fragmentation issues. However I cannot find an Altera RAM
> megafunction that provides more that two independent ports. This is not
> enough and will prevent the FPGA from processing packets (that have the

You cannot have more than 2 ports on their RAM.  It is wired up as a
dual-port RAM at most.  Use a FIFO for each channel as they are
independent from each other anyway.  Moreover, if you get it working
for 1 channel, instantiating the rest of the chain for 2, 3, N
channels is as easy as a for loop.

> I think sending one packet per transmit window in the most common.
> However I remember having read somewhere on the wiki what the maximum
> transmit is but I cannot find it again.

I am not really thinking about the rates, but more the mechanism as to
how it will be compared.  What will the state machine look like?  What
is the length of 1 tick?  How will it operate to make sure it can send
everything properly?  If a FIFO gets half empty, how quickly can we
get more samples to send out of modulated data?

Things like that.

Brian