Experimental Physics and Industrial Control System
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Title: RE: compact PCI versus VME
Ø what fpga are you using for
this?
That design uses a 400Mhz
XScale microprocessor external to the FPGA.
Ø Are you integrating timing in the compact Rio?
Micro Research Finland
has a cRIO
timing event receiver design in progress.
Ø Why use the proprietary backplane in place of just
dedicated fast serial interfaces?
Personally, I am not enamored
of proprietary backplanes, nor wire nanny-nudging proprietary programming
languages with binary source code formats changing every release, but the idea of modular analog front-ins that
attach directly to the pins of the FPGA is a pretty good one. With the cRIO approach for example the wire scanner DAQ and stepper motor
control logic IP can be in the same FPGA. The downside is that DAQ BW appears
to be limited based on the number of FPGA pins allocated to each of the signal conditioning
modules.
Jeff
______________________________________________________
Jeffrey O. Hill
Email [email protected]
LANL MS
H820
Voice 505 665 1831
Los Alamos NM 87545 USA
FAX 505 665 5107
Message
content: TSPA
From: Dalesio, Leo [mailto:[email protected]]
Sent: Tuesday, January 26, 2010 2:01 PM
To: Jeff Hill; Hoff, Lawrence
Cc: Fred E. Shelley Jr.; Eric Bjorklund; [email protected]
Subject: RE: compact PCI versus VME
For LANSCE LLRF they need the real-estate provided by 6u boards, and for DAQ
the bandwidth between the FPGA and the analog modules isn't appearing to be
sufficient in cRIO. So for those systems we need either cPCI, VME, or uTCA.
If we have a centralized CPU then the bandwidth in cPCI Express, VME/VXS, or
uTCA for DAQ interconnects looks attractive. Another option which we are
looking at is to just run EPICS embedded on every one of the (Ethernet
directly connected) DAQ/LLRF modules thereby eliminating the system
interconnect as a bottleneck/complexity between the DAQ/FPGA hardware and
switched Ethernet.
----------what fpga are you using for this? We looked at putting a power PC
core onto the FPGA, then we found out that this would not be supported on their
next generation FPGA. We have been looking at running the micro blaze processor
on it - and using a canned modbus server to talk to it over a 1Git Ethernet
port.
Are you integrating timing in the compact Rio?
Why use the proprietary backplane in place of just dedicated fast serial
interfaces?
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ANJ, 02 Sep 2010 |
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