ZY7_SLCR_LVL_SHFTR_EN
WR4(sc, ZY7_SLCR_LVL_SHFTR_EN, 0);
WR4(sc, ZY7_SLCR_LVL_SHFTR_EN, ZY7_SLCR_LVL_SHFTR_EN_ALL);
reg = RD4(sc, ZY7_SLCR_LVL_SHFTR_EN);
WR4(sc, ZY7_SLCR_LVL_SHFTR_EN, ZY7_SLCR_LVL_SHFTR_EN_ALL);
WR4(sc, ZY7_SLCR_LVL_SHFTR_EN, 0);