Re: [Discuss-gnuradio] USRP2 with Basic Tx Daugther board io_tx pins monitoring

[Matt Ettus]

On 03/14/2011 08:14 AM, Leonard Marziliano wrote:
> Hi,
> 
> I want to monitor the I and Q samples being send over to the AD9777 DAC
> (channel 1). I've noticed on the USRP2 schematic that the FPGA provides
> io_tx[0:15] pins which are routed on the daughter board for probing (I
> use the Basic Tx daugther board). Now, when I run the tx_samples app
> example to transmit sample (using a file read continuously) I get the
> signal to the sma connector alright but if I probe the io_tx pins, I get
> nothing.
> 
> The main question will be, is it possible for these pins to provide the
> same values send to the DAC ? Is there a special configuration or
> command that needs to be send to the FPGA to make these pins do what I
> want or  something else needs to be done ?


You would need to modify the FPGA code to send the DAC signal to those
pins, which are normally used for daughterboard control.

Matt