Processor DSP Cpu2Dsp HI REAL Cpu2Dsp LO REAL Dsp2Cpu HI REAL Dsp2Cpu LO REAL Dsp2Cpu HI SHDW Cpu2Dsp HI SHDW Copy SHDW -> REAL, Set Cpu2Dsp.HI.M Poll M Bit Set Clear Cpu2Dsp.HI.M Poll M Bit Set Clear Dsp2Cpu.HI.M Poll M Bit Clear Copy SHDW -> REAL, Set Dsp2Cpu.HI.M Poll M Bit Clear