Wilhelm Eger wrote: > Hi there, > > is there any chance to shut down the decoder of a PVR 350 to save power? >
The cx23415 (the main mpeg encoder/decoder chip) actually uses hardware units from both the encoder/decoder for both encoding and decoding, so basically no it's impossible (for the mpeg encoder/decoder chip that is) because the decoder is used for encoding somewhat (like audio, PCM processing, and even DMA xfers cross over for how they function). It's a bad design being tangled up like that and one of the big flaws of these chips is exactly that, power hungry and encoder/decoder were not ever engineered properly to be separate (the cx23416 on the pvr250/150/500 had the hardware units switched around some to chop out the decoder but leave the units needed for the encoder). It originally was designed under the concept of a full set top box core and so everything was just thrown in together, they even forgot to have the Java processors separated enough to safely encode/decode together :) (so obviously more than just bad design but also major flaws that weren't able to be fully realized till too late in the game, it took years it seems to fully test all hardware units enough to know they were flawed it seems, I'm not sure what they were doing from 99'-01', the chip was birthed back in the late 90's) hence it's lucky that works so well actually through mulitple firmware hacks and driver hacks (and the wonderful DMA errors are partly a still visible side effect of that problem, 3 non-atomic locking Java processors working side by side blindly and accessing the same global block of registers is a 'bad thing'). Thanks, Chris > Greetings, > > Wilhelm > > _______________________________________________ > ivtv-devel mailing list > [email protected] > http://ivtvdriver.org/mailman/listinfo/ivtv-devel > > _______________________________________________ ivtv-devel mailing list [email protected] http://ivtvdriver.org/mailman/listinfo/ivtv-devel
