USRP2 firmware

GNU Radio
1

Dear all,

  1. I have resynthesized USRP2 verilog code and generated its bit stream.
    I’m using ISE10.1 (with latest service pack). For top level module, I
    use u2_rev3.v and u2_core_udp.v are used. And bit file generated has
    size of 937kByte. But that size is different from “UDP fpga image (about
    841kB)” available at
    “http://code.ettus.com/redmine/ettus/projects/public/wiki/U2binaries”.
    Please advice to me.

  2. And for FPGA firmware, i’m quite confused. Because there are many
    available firmware images. Which one should i use (name with UDP)??

PN