I have a small PCI board which hosts an 68040 and an
68360. It plugs into a PC and uses a Spanner chip for
the PCI/68040 bridge (http://lamipc16.epfl.ch/Sm400.htm)
The 68360 is configured in 68040 companion mode. I am
using an external multiplexer for the address lines, as
shown in fig. 9-15 of the 68360 User's Manual.
I am now trying to access DRAM and have the following
problem: I cannot figure out why AMUX/BADD2/BADD3 are
tied to 5V whatever I write to PEPAR (enable AMUX) and
to GMR (GAMX=0).
The DRAM is tied to RAS4/RAS5, which seem to operate
normally. I can read/write to memory, but I can only
access a tiny portion of it.
Any help ? Any advice ? Any help would be appreciated !