PPU

I try to used ppu pck600 in P channel mode. for that I write state in the ppu APB interface .

But I don't get the output for the device with the state that I wrote and also I don't get high in the  preq_o (the output from the ppu t the device dev_preq_o and dev_pstate_o it stuck on 0 although the write in the APB interface  )

any idea what the issue or what I need to do to that the ppu will get out state to the device?