Ruprecht-Karls-Universität Heidelberg

Design and Implementation of a Vitual Channel Based Low-Latency Crossbar Switch

Diploma Thesis by Frank Ueltzhoeffer


In this diploma thesis, the crossbar switch for the next generation of low-latency networks, namely EXTOLL, is developed. The goal was to achieve high throughput and low latency as well as efficient use of the available network resources.
The result is a synthesizable HDL description that allows clock speeds of up to 500MHz in a 0.13um CMOS process. The crossbar fully integrates the concept of virtual channels to achieve significantly higher network throughput in comparison to ATOLL, the predecessor of EXTOLL.
This work provides an overview of current crossbar architectures and arbitration algorithms, followed by the definition of a new congestion avoiding virtual channel arbitration protocol that, to the best of our knowledge, has not previously been considered.
Not only does this work present the first synthesizable module of the EXTOLL chip, but it also provides an overview of the target technology and libraries that can be used by all subsequent works.


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