SAFE_PE_DMACFG
v = READ_REG(sc, SAFE_PE_DMACFG) &~
WRITE_REG(sc, SAFE_PE_DMACFG, v
WRITE_REG(sc, SAFE_PE_DMACFG, v);
v = READ_REG(sc, SAFE_PE_DMACFG);
WRITE_REG(sc, SAFE_PE_DMACFG, v);
WRITE_REG(sc, SAFE_PE_DMACFG, v | SAFE_PE_DMACFG_PEMODE);