EPICS Controls Argonne National Laboratory

Experimental Physics and
Industrial Control System

1994  <19951996  1997  1998  1999  2000  2001  2002  2003  2004  2005  2006  2007  2008  2009  2010  2011  2012  2013  2014  2015  2016  2017  2018  2019  2020  2021  2022  2023  2024  Index 1994  <19951996  1997  1998  1999  2000  2001  2002  2003  2004  2005  2006  2007  2008  2009  2010  2011  2012  2013  2014  2015  2016  2017  2018  2019  2020  2021  2022  2023  2024 
<== Date ==> <== Thread ==>

Subject: Re: IOC time 1min=90sec ??
From: Andrew Johnson <[email protected]>
Date: Tue, 17 Jan 1995 15:34:16 GMT
On Mon, 16 Jan 95 13:50:35 -0600 [email protected] wrote:

> Hmmmm that is 33.3333333333333333333% off the expected speed.  I find
> it interesting to note that 33 is 33.33.3333333333333333333% more than
> 25.  I don't fully understand your entire note.  But I suspect that you
> have a 33mHz mvme167 board that has its vxWorks configured for a 25mHz
> board.

I've never heard of a milli-Herz MV167!  (Sorry, couldn't resist that!)

I hadn't thought about this as being a symptom of having the wrong speed 
setting, but it makes perfect sense.

> I don't exectly know how to set the value in the NVRAM to to proper
> value, but that would be the nice way to fix the problem...  Otherwise
> you will have to change the hard-coded clock rate settings in sysLib.c.
> Grep for 'cpuSpeed' in sysLib.c to find the line(s) of interest.  (WRS
> blew it, the value on the assignment should be #define'd.)

Simple, for a 33Mhz CPU (33 = 0x21):

->m 0xfffc00fe
fffc00fe:  0000-21ee
fffc0100:  0000-.

value = 1 = 0x1
->reboot

- Andrew

          ,_}\_.        Andrew Johnson, Technology Division
         /      \       Royal Greenwich Observatory
~~~~~~~~| ,--/;. )~~~~  Madingley Road, Cambridge, UK
    .,  |/  (/  U       Phone: +44 (0)1223 374823
  .`., /_\ . .          Email: [email protected]
     wwWWWww'           WWW: http://cast0.ast.cam.ac.uk/~anj/




Navigate by Date:
Prev: NI VXIcpu-030 Ric Claus
Next: Re: TS - EAST from GMT Deb Kerstiens
Index: 1994  <19951996  1997  1998  1999  2000  2001  2002  2003  2004  2005  2006  2007  2008  2009  2010  2011  2012  2013  2014  2015  2016  2017  2018  2019  2020  2021  2022  2023  2024 
Navigate by Thread:
Prev: IOC time 1min=90sec ?? Gabor Csuka, DESY - Germany
Next: NI VXIcpu-030 Ric Claus
Index: 1994  <19951996  1997  1998  1999  2000  2001  2002  2003  2004  2005  2006  2007  2008  2009  2010  2011  2012  2013  2014  2015  2016  2017  2018  2019  2020  2021  2022  2023  2024 
ANJ, 10 Aug 2010 Valid HTML 4.01! · Home · News · About · Base · Modules · Extensions · Distributions · Download ·
· Search · EPICS V4 · IRMIS · Talk · Bugs · Documents · Links · Licensing ·