Xbox360 Front Side Bus – A 21.6 GB/s End-to-End Interface Design

David Siljenberg, Steve Baumgartner, Tim Buchholtz, Mark Maxson, Trevor Timpane, Jeff Johnson
IBM Systems & Technology Group
Asia and South Pacific Design Automation Conference, 2007. ASP-DAC ’07


   title={Xbox360 TM Front Side Bus-A 21.6 GB/s End-to-End Interface Design},

   author={Siljenberg, D. and Baumgartner, S. and Buchholtz, T. and Maxson, M. and Timpane, T. and Johnson, J.},

   booktitle={Proceedings of the 2007 Asia and South Pacific Design Automation Conference},



   organization={IEEE Computer Society}


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With a bandwidth of 21.6 GB/s, the front side bus (FSB) of the Microsoft Xbox360trade is one of the fastest, commercially available front side bus interfaces in the consumer market. This paper explains the end-to-end system approach used in designing the bus that achieved volume production ramp 18 months after design start. The 90 nm SOI-CMOS CPU and 90 nm bulk CMOS GPU designs are described. The chip carrier, circuit board, and signal integrity analyses are described. The design approach used to achieve high volume, low cost, and short development time is explained.
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