COMSTAT
u32 comstat = asd_read_reg_dword(asd_ha, COMSTAT);
asd_write_reg_dword(asd_ha, COMSTAT, 0xFFFFFFFF);
asd_write_reg_dword(asd_ha, COMSTAT, COMSTAT_MASK);
reg = asd_read_reg_dword(asd_ha, COMSTAT);