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

[Alexander Chemeris]

On Wed, Aug 17, 2011 at 21:50, Nick Foster <address@hidden> wrote:
> 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 outdated.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".

Thanks. I've updated FAQ:
http://gnuradio.org/redmine/projects/gnuradio/wiki/USRP2GenFAQ#What-is-the-1-Megabyte-SRAM-used-for
Please check if I'm correct.


-- 
Regards,
Alexander Chemeris.