On Thu, Oct 12, 2006 at 12:10:23AM -0700, Oussama Sekkat wrote: > One of the input to the usrp_std module is SDI. From my understading, a > serial address and serial data is sent through that input in order to > control registers inside the FPGA. What I don't know is the origin of the > input. It doesn't seem to be coming from the GPIF bus. > How is the SDI signal sent from the USB to the FPGA?
The 8051 bit-bangs the SDI data, clock, and strobe lines. They are "slow" compared to other FPGA actions. See usrp-*/firmware/src/usrp1/spi.c - Larry _______________________________________________ Discuss-gnuradio mailing list Discuss-gnuradio@gnu.org http://lists.gnu.org/mailman/listinfo/discuss-gnuradio