On Sun, Feb 01, 2009 at 12:30:58AM -0500, Paul Creekmore wrote: > The FPGA on USRP1 sends an extra two bits of data with each 16-bit word > (to the FX2 chip). If I'm not mistaken, the first bit is set when > accompanying a sample from rx channel 0, and the second bit is set when > accompanying an inphase (as opposed to quadrature) sample (presumably > from channels 0, 2, 4, or 6). > > * What significance do these two bits have in the handling of the data > after the FPGA? > > I'm trying to figure out how best to set these bits in the case of > packed samples at lower quantization levels. > > Thanks, > Paul
Uhh, what two extra bits? The GPIF bus is 16-bits wide... The FPGA does report two status bits (independent of the data bits) that indicate whether (1) it has room for a new packet from the FX2 and (2) if it has a packet available for the FX2. I don't think anything you're doing should have anything to do with how those flags are generated. Did this help? Eric _______________________________________________ Discuss-gnuradio mailing list [email protected] http://lists.gnu.org/mailman/listinfo/discuss-gnuradio
