XAE_FFC
reg = XAE_RD4(sc, XAE_FFC) & 0xffffff00;
XAE_WR4(sc, XAE_FFC, reg);
reg = XAE_RD4(sc, XAE_FFC);
XAE_WR4(sc, XAE_FFC, reg);
reg = XAE_RD4(sc, XAE_FFC);
XAE_WR4(sc, XAE_FFC, reg);