S_IO_SLEW2
#define M_IO_SLEW2 _SB_MAKEMASK(2, S_IO_SLEW2)
#define V_IO_SLEW2(x) _SB_MAKEVALUE(x, S_IO_SLEW2)
#define G_IO_SLEW2(x) _SB_GETVALUE(x, S_IO_SLEW2, M_IO_SLEW2)