Rolls-Royce Controls and Data Services designs electronic engine controllers and other systems for aerospace gas turbines. They developed the VISIUM GR processor starting in 1997 using ASIC technology, and added Ada support in 2002. In 2005 they introduced the VISIUM GR5 using a multi-chip module design for improved robustness and obsolescence management. They are now developing the VISIUM GR6 to replace the GR5 due to many component obsolescences and to increase computing performance. Rolls-Royce partnered with AdaCore for support of the GNAT compiler targeting their GR5 and new GR6 processors.

1. 1
VISIUM™ GR6
Ivan Ellis
©2014 Rolls-Royce Controls and Data Services Limited
The information in this document is the property of Rolls-Royce Controls and Data Services Limited and may not be communicated to a third party or
used for any purpose other than that for which it is supplied, without the express written consent of Rolls-Royce Controls and Data Services Limited
©2014 Rolls-Royce Controls and Data Services Limited
Information proprietary to Rolls-Royce Controls and Data Services Limited

2. Agenda
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• Background
• Challenges
• VISIUM™ GR Processor History
• VISIUM™ GR5 & GR6
• Involvement with AdaCore
©2014 Rolls-Royce Controls and Data Services Limited
Information proprietary to Rolls-Royce Controls and Data Services Limited

3. Background
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• Controls and Data Services (CDS) designs and manufactures a range of
products for the aerospace gas turbine market
– Fuel Systems
• Pumps
• Metering Units
• Actuators
– Electronics
• Electronic Engine Controllers (FADEC)
– Software
• RTCA DO-178B (and now C)
©2014 Rolls-Royce Controls and Data Services Limited
Information proprietary to Rolls-Royce Controls and Data Services Limited

4. Challenges
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• Aerospace electronic engine controls has several challenges
– Environment
• Ambient temperature range, -54˚C to +85˚C (or greater)
• Moisture and Dust
• Lightning
• Vibration
– Obsolescence
• Products require supporting for 20 years or more
©2014 Rolls-Royce Controls and Data Services Limited
Information proprietary to Rolls-Royce Controls and Data Services Limited

5. VISIUM™ GR Processor History
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• First VISIUM™ GR design started in 1997
– Processor for a number of applications running a proprietary language
– Processor implemented in ASIC technology
• Separately packaged processor, RAM, PROM etc. on printed circuit board (PCB)
• Ada support developed in 2002 for 2003 VISIUM™ GR application
– In-house toolchain based on GNAT 3.4.4
• First Multi-Chip-Module design, VISIUM™ GR5, started in 2005
– RTCA DO-254 Level A compliant design processes
©2014 Rolls-Royce Controls and Data Services Limited
Information proprietary to Rolls-Royce Controls and Data Services Limited

6. VISIUM™ GR5 & GR6
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• Multi-Chip Module design
– Integrates all computing elements
into a single package
• Reduces PCB area
– Physically robust
• Vibration
• Temperature
• Atmosphere
– Improved obsolescence management
• But GR6 now needed
– Many GR5 components now obsolete
– Increased computing performance
• GR6 will replace GR5 in current
applications
©2014 Rolls-Royce Controls and Data Services Limited
Information proprietary to Rolls-Royce Controls and Data Services Limited

7. Involvement with AdaCore
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• Self-supporting a compiler can have many issues:
– High reliance on key individuals
– Limited knowledge outside specific areas of compiler design
– Long response time to problems
– Difficult to manage toolchain updates
• CDS has selected AdaCore to provide GNAT Pro with support for VISIUM™
GR5 and GR6 targets
• Further information on CDS is available at http://www.controlsdata.com/
©2014 Rolls-Royce Controls and Data Services Limited
Information proprietary to Rolls-Royce Controls and Data Services Limited