Re: [Discuss-gnuradio] USRP question: Writing to AD9862 registers from FPGA?

[Eric Blossom]

On Wed, Jun 03, 2009 at 10:28:55PM -0400, Aviv Keshet wrote:
> Hi gnuradiators,
> 
> I know I can use the usrper program to write values to the registers of the 
> two
> 9862 chips (on the USRP1). I am using the USRP1 for a custom application, with
> my own FPGA code. My question is whether it is possible for the FPGA to write
> values to these registers directly?

No, there are no wires that connect these.

> Or is it only the cypress microcontroller that has access to these registers?

yes.

> And if so, is it possible for the FPGA to command the microcontroller to do 
> so?

no.


> I didn't find any obvious verilog module that does this when looking through 
> the
> original verilog code. If it exists and I missed it, please let me know.
> 
> Thank you,
>    Aviv Keshet

FYI, on the USRP2 everything connects to the FPGA ;-)

Eric