IG4_REG_FS_SCL_HCNT
REGDUMP(sc, IG4_REG_FS_SCL_HCNT);
v = reg_read(sc, IG4_REG_FS_SCL_HCNT);
reg_write(sc, IG4_REG_FS_SCL_HCNT, v);
reg_write(sc, IG4_REG_FS_SCL_HCNT, 100);