Experimental Physics and
Industrial Control System

Hi,

I have a problem setting up a 162 cpu to work with the SIAM (Bira 7550) module.
This module allows A24 access only. It has an Status register (32 bits)
at its
base address and then various 16bit registers at +4... addresses. As far
as I
understand the BSP for the 162 (in syslib.c) the VME access in A24 mode is
word (16 bit) only. When the code accesses the statusregister with a long
pointer the VMEchip2 is supposed to break this into 2 cycles of 16 bit and
then fit the longword together from the two pieces, right?
When I print out the status register contents I get 0xcd55ffff. On a VMEbus
display I see the 0xffff and the last address being 0x00300002. But the word
0xcd55 is the (fixed) contents of the ID register of the module, at address
0x00300004.
 Something wrong in the way the registers are setup for the VMEchip2?

Burkhard Kolb
GSI Darmstadt
HADES detector

Replies:

Re: Problem with MVME162 and A24/D32 or D16 access to SIAM Perry L. Anthony

Re: Problem with MVME162 and A24/D32 or D16 access to SIAM Burkhard W. Kolb

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