ATR_ROP
mgx_write_1(sc->sc_xreg, ATR_ROP, ROP_SRC);
mgx_write_1(sc->sc_xreg, ATR_ROP, ROP_SRC);
mgx_write_1(sc->sc_xreg, ATR_ROP, ROP_SRC);
mgx_write_1(sc->sc_xreg, ATR_ROP, ROP_SRC);
mgx_write_1(sc->sc_xreg, ATR_ROP, (uint8_t)~ROP_SRC);