COPPER_REG_SCPR
ips_write_1(sc, COPPER_REG_SCPR, 0x80);
ips_write_1(sc, COPPER_REG_SCPR, 0);
ips_write_1(sc, COPPER_REG_SCPR, COPPER_EBM_BIT);
i = ips_read_1(sc, COPPER_REG_SCPR);