Experimental Physics and
Industrial Control System

"Steven M. Hartman" <[email protected]> · Tue, 22 Nov 2011 12:08:21 -0500

Andrew Johnson wrote:

So basically your code is trying to read a D32 value from an A32 location with

a supervisory AM, but it's not getting any response (or the target is

rejecting an access of that AM or size).

Zenon--

It's been a number of years since I used a BiRa VSAM, but I recall

it had some peculiarities with its VME interface (among other

quirks) which I needed to work through at the time. (The VSAM is a

very nice card in terms of performance, though.)

With Andrew's analysis of your error message, and Google to help my

memory, this sounds like your problem . . .

"If you have an A32/D32 module at 0x80400000 and a VSAM at

0x00400000, the VSAM will generate a bus error for accesses to the

other module."

http://www.slac.stanford.edu/grp/cd/soft/epics/site/vsam/vsam_busError.txt

In my case, I did not cut the trace, but instead ensured that I

didn't have the address overlap.

--
Steven Hartman
[email protected]

Experimental Physics and Industrial Control System

Experimental Physics and
Industrial Control System