S_MAC_SPEED_SEL
#define M_MAC_SPEED_SEL _SB_MAKEMASK(2, S_MAC_SPEED_SEL)
#define V_MAC_SPEED_SEL(x) _SB_MAKEVALUE(x, S_MAC_SPEED_SEL)
#define G_MAC_SPEED_SEL(x) _SB_GETVALUE(x, S_MAC_SPEED_SEL, M_MAC_SPEED_SEL)