KanedaFr wrote:Like I said, I'd like to confirm if there is any link between comm, sub and data....or they're totally independant
so could you measure IRQ / WFCK / LRCK on the same timing ?
Here we come. Power up and boot
Earthworm Jim CD:
![Image](http://savepic.ru/14649417m.png)
Some closeups with nIRQ is active:
![Image](http://savepic.ru/14663752.png)
I think they must be independent, but still within 16MHz (
DFCK) clock domain. It makes sense to synchronize only I2C and sub-channel. Their flow can be synchronous, because they are read linearly from the CD matrix. Control section don't require to be synced to I2S and subchannel. I think the
nIRQ timing was done by
DFCK division.
It's like a
nIRQ not synced to any of signal. As I said before, this signal has 6,33ms period time slot. But it don't fire up at every slot (6,33ms), some slots a skipped (when drive controller busy?).
BTW, 6,33ms is ~157Hz. Maybe it is 2x 1/75? 75*2=150Hz and I got just measurement error?