Forward and Backward Guarding in Early Output Logic

Provided by: Institute of Electrical & Electronic Engineers
Topic: Hardware
Format: PDF
Quasi delay insensitive asynchronous logic is a very robust system allowing safe implementations while requiring minimal timing assumptions. Unfortunately the design methodologies using this system have always yielded very slow designs. Early output logic is a method which aims to improve the performance of QDI circuits without decreasing their robustness. In order to force QDI restrictions on early output circuits a form of guarding is necessary. This paper presents a new form of guarding which allows partial stage completion allowing desynchronisation of inputs.

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