Re: [Discuss-gnuradio] Split-function implementation of 802.11g OFDM PHY and MAC on USRP2

[Nick Foster]

On Wed, 2011-08-17 at 21:47 +0400, Alexander Chemeris wrote:
> On Wed, Aug 17, 2011 at 21:15, Nick Foster <address@hidden> wrote:
> > On Wed, 2011-08-17 at 18:00 +0400, Alexander Chemeris wrote:
> >> Hi Nick,
> >>
> >> On Sat, Aug 13, 2011 at 02:41, Nick Foster <address@hidden> wrote:
> >> > On Fri, 2011-08-12 at 23:26 +0100, Nemanja Trecakov wrote:
> >> >> 1) Did anybody use this external SRAM
> >> >> on USRP2 before? According to the FAQ page the usual FPGA build is
> >> >> not using it.
> >> >> (http://gnuradio.org/redmine/projects/gnuradio/wiki/USRP2GenFAQ)
> >> >> However, my experience with these pages is that many of them are
> >> >> outdated. I also found the folder called extramfifo in
> >> >> uhd/fpga/usrp2 folder for which I believe has something to do with
> >> >> external RAM.True?
> >> >
> >> > The external SRAM is currently used for buffering TX packets.
> >>
> >> Is it true for USRP N and latest git too?
> >>
> >
> > yes
> >
> 
> By Tx do you mean Ethernet->RF aka RF Tx, or RF->Ethernet aka Eth Tx?

RF TX. It's there as a buffer so you can use timestamped TX packets to
say "send this data at exactly time X".

--n

> 
>