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Re: [Discuss-gnuradio] Re: mux on usrp Tx side

From: Eric Blossom
Subject: Re: [Discuss-gnuradio] Re: mux on usrp Tx side
Date: Sat, 9 Jun 2007 07:03:53 -0700
User-agent: Mutt/1.5.9i

On Sat, Jun 09, 2007 at 09:43:02AM -0400, Achilleas Anastasopoulos wrote:
> After a bit of digging I think I partially
> answered my questions.
> Just to make sure I have it right:
> There are 2 complex interpolators implemented in the FPGA (say int0, and 
> int1). There are 4 real (ie, 2 complex) upconverters implemented in the 
> DAC chips (say dac0, dac1, dac2, dac3). The mux routes the I and Q
> of int0 and int1 to the appropriate dacs.
> Is it true that dac0,1 are hardwired to the TXA side of the USRP and 
> dac2,3 to the TXB?
> Also, is the second complex interpolator used only if nchannels = 2 ?
> Thanks
> Achilleas

Yes.  You have it right.


> Achilleas Anastasopoulos wrote:
> >
> >I understand the purpose of the mux on the rx side of the usrp.
> >
> >I have a question regarding the tx side of the usrp.
> >In particular, it is not clear to me what the purpose of the mux
> >is on the tx side.
> >My understanding is that the samples from the USB (say complex)
> >are interpolated by N in the FPGA, then further interpolated
> >by 4 in the DAC chip (to reach 128Msps), then digitally up-converted and 
> >then digital-to-analog converted.
> >
> >where is the Mux in this chain? and what does the default value 152 
> >represent?
> >
> >Thanks
> >Achilleas
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