(MAPLD Conference)
PAB4: Daniel E.
Rodriguez
The Johns Hopkins University/Applied Physics Laboratory
"A Simplified PCI Backplane Approach for the TIMED Spacecraft Integrated Electronics Module"
The NASA Thermosphere-Ionosphere-Mesosphere Energetics and Dynamics (TIMED) Spacecraft employs an Integrated Electronics Module (IEM) containing digital and RF subsystems for command and data handling, uplink and downlink signal processing, GPS navigation, and power conditioning. The fundamental design requirement for the communication path between several of these subsystems calls for a multi-master bus with a data transfer capability of 5 Mbytes/sec. Further requirements impose implementation of a bus controller within a single gate array device and utilization of commercially available test equipment for stand-alone board level testing. This article describes how the system requirements were satisfied by the selective implementation of the PCI bus specification. The design consists of a master and target controller co-existing within a single Actel, A1280A field-programmable gate array. Restricting the layout to combinational logic modules yields an SEU resistant design capable of withstanding the mission radiation environment.Home
Last Revised: July 03, 2002
Digital Engineering Institute
Web Grunt: Richard Katz
