DRAM_ROW_CNTL_HI
uint8 temp = INREG8(DRAM_ROW_CNTL_HI) & ~DRAM_REFRESH_RATE;
OUTREG8(DRAM_ROW_CNTL_HI, temp | DRAM_REFRESH_DISABLE);
temp = INREG8(DRAM_ROW_CNTL_HI) & ~DRAM_REFRESH_RATE;
OUTREG8(DRAM_ROW_CNTL_HI, temp | DRAM_REFRESH_60HZ);