I was looking at the UsrpTxModifications page in wiki, I want to understand how the Tx goes.
my question is what is the spi_bus that goes into the data block and come out of the command block, is it internal in the FPGA?
looking at the UsrpRfxDiagrams in the first digram I see the signal come out of the FPGA as I and Q, But looking into the data sheet of the AD9862 there is only one input as the Tx data and from there it become as I and Q signals.
Is there any detailed diagram of the 'inside' FPGA, I have know two different diagram one on the wiki page the other is writing by Oussama Sekkat( I have it as pdf), which one is the write one.
Another thing I want to send two signals from two tx boards but phase shifted from each other, is there a way to control the phase of the Tx signal?