IO_CG_VOLTAGE_DROP
sclk_more_cntl |= IO_CG_VOLTAGE_DROP;
sclk_more_cntl &= ~IO_CG_VOLTAGE_DROP;
dyn_sclk_vol_cntl |= IO_CG_VOLTAGE_DROP;
dyn_sclk_vol_cntl &= ~IO_CG_VOLTAGE_DROP;