“…The f avg-max of the frequency mix was set approximately to 100 MHz. To switch the control, three types of number sequences were evaluated: (1) linear sequence, (2) LFSR based random number [9] and (3) cellular automata based random number sequences [11]. The sampling distribution characteristics of pseudo random clocks were studied for 1GHz, 622.08MHz, 500MHz, 300MHz and 250MHz signals.…”
Section: Experimental Setup and Resultsmentioning
confidence: 99%
“…In this work we compare three types of switching sequences: (1) linear sequence, (2) LFSR based random number [9] and (3) cellular automata based random number sequences [11].…”
Section: ) Pseudo Random Clock Produced By Frequency MIXmentioning
Abstract-A statistical random sampling technique has recently emerged as an elegant design-time efficient technique to address many timing issues of on-chip signals. To obtain reliable measurement results, it requires uniformly distributed sampling edges within the interval defined by the periodic cycles of the signal under measurement. This paper analyzes the characteristics of a random sampling clock relative to the signal under measurement and provides design rules for synthesis of pseudo-random sampling clocks. The proposed circuit provides a way to mix a range of frequencies in a pseudo-random fashion to produce uniformly distributed edges for random sampling, which yields measurement accuracy very close to that of true random sampling. A practical circuit design technique of pseudo-random clock generation is proposed based on a standard cell approach. This allows on-chip integration of a random clock generator while keeping the overall system design-time efficient and portable across varying technologies. The proposed designs are targeted to IBM Cu-08 standard cell libraries and provide a measurement resolution of 1ps.
“…The f avg-max of the frequency mix was set approximately to 100 MHz. To switch the control, three types of number sequences were evaluated: (1) linear sequence, (2) LFSR based random number [9] and (3) cellular automata based random number sequences [11]. The sampling distribution characteristics of pseudo random clocks were studied for 1GHz, 622.08MHz, 500MHz, 300MHz and 250MHz signals.…”
Section: Experimental Setup and Resultsmentioning
confidence: 99%
“…In this work we compare three types of switching sequences: (1) linear sequence, (2) LFSR based random number [9] and (3) cellular automata based random number sequences [11].…”
Section: ) Pseudo Random Clock Produced By Frequency MIXmentioning
Abstract-A statistical random sampling technique has recently emerged as an elegant design-time efficient technique to address many timing issues of on-chip signals. To obtain reliable measurement results, it requires uniformly distributed sampling edges within the interval defined by the periodic cycles of the signal under measurement. This paper analyzes the characteristics of a random sampling clock relative to the signal under measurement and provides design rules for synthesis of pseudo-random sampling clocks. The proposed circuit provides a way to mix a range of frequencies in a pseudo-random fashion to produce uniformly distributed edges for random sampling, which yields measurement accuracy very close to that of true random sampling. A practical circuit design technique of pseudo-random clock generation is proposed based on a standard cell approach. This allows on-chip integration of a random clock generator while keeping the overall system design-time efficient and portable across varying technologies. The proposed designs are targeted to IBM Cu-08 standard cell libraries and provide a measurement resolution of 1ps.
“…The random mechanism employs the greedy approach as a backbone, but it allows for overwriting of paths if the probability of caching that path (as obtained from a random number generator) is greater than a certain threshold. 32-bit non-local and asymmetrical cellular-automata CA25443 was used as a random number generator because it passed more empirical randomness tests, displayed large cycle length [7] and allowed efficient implementation.…”
“…In [1], Barry et al expanded the neighborhood size to four and introduced a nonlocal neighborhood connection scheme. They found a number of 64-cell 1-D CA PRNGs passing DIEHARD through exhaustive searching.…”
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