About usrp_std.v

Hello

Can i know the exact functionality of usrp_std.v . which is inside
…radio\usrp\fpga\toplevel\usrp_std at GNU radio/wiki.

i tried to understand this program but getting difficulty in
understanding this.

Also it includes 2 more Verilog files
fpag_regs_standard.v
and
fpag_regs_common.v

so how these 2 files is used for usrp_std.v

also one usrp_std.vh file is there … which is also what type of code it
is… i mean it is not a verilog then what else…?

i hope for answer from the people who has downloded the verilog code
onto this usrp board.

Thank you
pankaj