fix STT bug for strong waves (or cleaned ones)

[proxmark3-svn] / fpga / xst_hf.scr

run -ifn fpga_hf.v -ifmt Verilog -ofn fpga_hf.ngc -ofmt NGC -p xc2s30-5-vq100 -top fpga_hf -opt_mode area -opt_level 2 -resource_sharing yes -fsm_style bram -fsm_encoding compact