Q: 68360 and AMUX in 68040 companion mode

Q: 68360 and AMUX in 68040 companion mode

Post by Pierre Arna » Fri, 30 Aug 1996 04:00:00



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 !

        Pierre


http://diwww.epfl.ch/lami/team/arnaud/

 
 
 

1. 68040 and 68360 companion mode

Hi

Has anyone used the 360 in companion mode with the 040.  I have a
question regarding the timing specified in the 360 hardware users
manual on pg 10-58.  I need to know the WE and OE timing when
the 360 is in companion mode and when TSS40 = 1 and CSNT40 = 1.

If anyone has any experience with this, please drop me a line at

Hrishi

--

~~~~~Srinivasan Hrishikesh~~~~~~~~~NTD, COMSAT Labs, MD~~~~~~~~~~~
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|    URL : http://vtdal7.dal.ee.vt.edu/hrishi/hrishi.html        |
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