Experimental Physics and
Industrial Control System

[email protected] (Jim B. Kowalkowski) · Wed, 15 Jun 94 10:11:36 CDT

>To: [email protected]
>Subject: Re:  DSP
>In-Reply-To: Mail from 'Abhijit Nagchaudhuri <[email protected]>'
>     dated: Wed, 15 Jun 1994 10:25:54 -0400
>Status: R

The Pentek board I have has a C30 (TI) in it.  I think they have a version
with the C40 also.  I haven't done any research on other boards that
use the C30/C40 processors, so I am not promoting this board as being
THE board to use - even though it does look very reasonable and it
was chosen by a group that needs high performance.

I chose to map the Pentek card into A32 on the VME backplane.  The MV167
memory is mapped on the backplane.  I reserved a section of Pentek
memory for interprocess communication and am using a VME interrupt to 
signal the MV167 that the Pentek card need servicing.  I am creating a loader
that runs under vxWorks, in the startup.cmd file the user can invoke the
this loader.  The loader copies the C30 execuable into the Pentek module's
memory in A32 on the VME backplane and signals the Pentek to start executing.

Here is the general scheme:
1) load Pentek memory with program from vxWorks on the MV167

2) initialize a interprocess communication control block
   - the control contains a buffer address for pentek module to deposite
   data when it completes an operation and some flags.

2) start the program executing

3) the  pentek completes an operation
   - copy the results (over VMEbus) to the address in the control block
   - interrupt (VME) the MV167/vxWorks

4) vxWorks interrupt handler alerts record processing (EPICS) that data
   is available.

5) record suppport runs and does things that record support normally does -
   set alarms, trigger monitors, forward link, etc..

This is a fairly simple system, all transfers are done over the VME A32
address space and controlled by a small control block in the Pentek module's
memory.

Jim K.

Experimental Physics and Industrial Control System

Experimental Physics and
Industrial Control System