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NASA/BAE SYSTEMS SpaceWire EffortThis paper discusses the state of the NASA and BAE SYSTEMS developments of SpaceWire. NASA has developed intellectual property that implements SpaceWire in Register Transfer Level (RTL) VHDL for a SpaceWire link and router. This design has been extensively verified using directed tests from the SpaceWire Standard and design specification, as well as being randomly tested to flush out hard to find bugs in the code. The high level features of the design will be discussed, including the support for multiple time code masters, which will be useful for the James Webb Space Telescope electrical architecture. This design is now ready to be targeted to FPGA's and ASICs. Target utilization and performance information will be presented for Spaceflight worthy FPGA's and a discussion of the ASIC implementations will be addressed. In particular, the BAE SYSTEMS ASIC will be highlighted which will be implemented on their .25micron rad-hard line. The chip will implement a 4-port router with the ability to tie chips together to make larger routers without external glue logic. This part will have integrated LVDS drivers/receivers, include a PLL and include skew control logic. It will be targeted to run at greater than 300 MHz and include the implementation for the proposed SpaceWire transport layer. The need to provide a reliable transport mechanism for SpaceWire has been identified by both NASA And ESA, who are attempting to define a transport layer standard that utilizes a low overhead, low latency connection oriented approach that works end-to-end. This layer needs to be implemented in hardware to prevent bottlenecks.
Document ID
Document Type
Conference Paper
Rakow, Glenn Parker
(NASA Goddard Space Flight Center Greenbelt, MD, United States)
Schnurr, Richard G.
(NASA Goddard Space Flight Center Greenbelt, MD, United States)
Kapcio, Paul
(BAE Systems Manassas, VA, United States)
Date Acquired
August 21, 2013
Publication Date
October 1, 2003
Subject Category
Computer Programming And Software
Meeting Information
Meeting: International SpaceWire Seminar 2003
Location: Noordwijk
Country: Netherlands
Start Date: November 4, 2003
End Date: November 5, 2003
Distribution Limits
Work of the US Gov. Public Use Permitted.

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