DMG-CPU-Inside
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P10, P11, P12 and P13 nets are mislabelled
On page 5, the output of KALE
is wrongly labelled P13_C
, it should be P13_D
.
On the same page, the outputs of KOLE
and KYTO
are wrongly labelled P10_B
and P11_B
. They should be labelled P10_A
and P11_A
respectively.
P10_B
, P11_B
, P12_B
and P13_B
are all connected to each other directly at the IO ports. This connection is nowhere to be found in the schematics.
On page 2, the inputs of KERY
all should have the _C
suffix.
The label P10_B
is widely used throughout the schematic. KOLE
is not the driver of this net. KOLE
drives P10_A
as already mentioned above. I retraced the whole P10_B
net but I wasn't able to find the actual driving cell.
Just wanted to throw this out there, because I think it is interesting: After eliminating VAVE
in #22 and "re-connecting" VYPO
in #20, the net labelled P10_B
is the only one that has those pesky cells labelled "BUFFER?", which may or may not be inverting. Maybe this "discovery" helps somehow in finding the actual driver of this net.
Here are all the "BUFFER?" cells:
@msinger , I have come to the same conclusion as you regarding these cells. If incorrectly named net P10_B becomes GND, everything works properly in my PPU simulation.
@rgalland thank you very much, that's great to know. I haven't simulated the PPU yet, so I wasn't sure about this ground connection, until now. ^^