On 06/09/2014 06:05 AM, bob wole wrote: > > Can I have a comment on it? > > Bob, > > we've given you a lot of information on this (see Tom's posts as a > start). If you still have questions, I recommend you start a new thread > and post exactly what you need to know and what your requirements are. > > M >
Marting, I got the answer from Tom, clock resolution for checking *tx_time* tag is 10ns (100MHz clock). Thanks -- Bob > > > > > -- > > Bob > > > > On Thu, Jun 5, 2014 at 11:02 AM, bob wole <bnw...@gmail.com > > <mailto:bnw...@gmail.com>> wrote: > > > > Sorry for not stating the hardware earlier. I am using USRP N210, > > with RFX2400 and WBX boards. > > > > -- > > Bob > > > > On Wed, Jun 4, 2014 at 11:07 PM, Marcus Leech <mle...@ripnet.com > > <mailto:mle...@ripnet.com>> wrote: > > > > I don't know the detailed answer, but any such answer will > > depend very much on which USRP hardware you're talking about. > > > > One of the R&D people who deals with the FPGA codebase may be > > able to give a precise answer, given stated hardware. > > > > > > > > on Jun 04, 2014, *bob wole* <bnw...@gmail.com > > <mailto:bnw...@gmail.com>> wrote: > > > > Marcus! Thanks for you comment. > > > > I think that USRP transmit FIFO is at the start of the DSP > > chain in FPGA i.e it is prior to both of the interpolation > > filters? right? I am not talking about when the burst will > > be over the air, I want to know when the first sample of the > > burst will leave the transmit FIFO if it has been tagged as > > tx_time=X. > > > > > > > > -- > > Bob > > > > > > On Wed, Jun 4, 2014 at 10:51 PM, Marcus Leech > > <mle...@ripnet.com <mailto:mle...@ripnet.com>> wrote: > > > > It will depend some on the effective group delay of both > > the interpolation filters in the the FPGA and the analog > > group delay of the analog bits of whatever daughtercard > > you're using. > > > > The only way to be sure is to measure... > > > > > > on Jun 04, 2014, *bob wole via USRP-users* > > <usrp-us...@lists.ettus.com > > <mailto:usrp-us...@lists.ettus.com>> wrote: > > > > I am using stream tags for the transmission control. > > I want to know what is the accuracy/precision of the > > tx_time tag? E.g if I tag a burst A with tx_time=X, > > then the burst A will come out of the USRP transmit > > FIFO at X+delta, how large the value of delta could > > be? > > > > > > -- > > Bob > >
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