Demonstration and Comparison of On-Chip High-Frequency Test Methods for RSFQ Circuits

Li, Songrui; Chen, Liyun; Ying, Liliang; Ren, Jie; Wang, Zhen

doi:10.1109/tasc.2023.3234880

Cited by 2 publications

(1 citation statement)

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“…The linear feedback shift register (LFSR) is a truly wondrous construct: it consists of a very simple hardware structure yet adheres to very powerful mathematical properties. This is the reason why the LFSR has been adopted in many applications such as pseudo-random number generation [1], circuit testing [2,3], error detection and correction [4,5], and the implementation of fast counters for various applications [6,7].…”

Section: Introductionmentioning

confidence: 99%

New Programmable LFSR Counters with Automatic Encoding and State Extension

Grymel

2024

Electronics

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An efficient method for detecting the end of a count of a linear feedback shift register (LFSR) is presented. We show how this detector can be used to extend a maximum-length LFSR sequence by a number of states up to one less than the degree of the polynomial. In addition, a new algorithm is proposed to encode binary sequence values into their corresponding LFSR sequence states. Based on this algorithm and an alternative second method, two novel programmable, full-range, high-speed LFSR counter designs are proposed. The time complexity of the conversion algorithms ranges from quadratic to exponential time in the degree of the underlying polynomial. The proposed counter solutions are fully synchronous and can be implemented with standard cells, enabling easy portability across technologies. As the levels of logic are independent of the counter size, high scalability is facilitated. For evaluation, all the designs, including the recreated state-of-the-art solution, have been implemented on an FPGA, and also simulated targeting TSMC’s N3 CMOS process node for a wide range of counter sizes. The results confirm the superiority of the proposed solutions over the state of the art in terms of frequency, area and power efficiency as the counter is scaled up.

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