Comparison of tree and straight-line clocking for long systolic arrays

Dikaiakos, Marios D.; Steiglitz, K.

doi:10.1109/icassp.1991.150588

Cited by 4 publications

(2 citation statements)

References 14 publications

(22 reference statements)

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“…They have also used a metric model assuming H-Tree layout to conclude that skew grows as l(N1/4(log N)l/2). In [2] a metric free probabilistic model is used to study clocking long linear arrays from a tree. The study shows that the clock period must be increased at the rate log N to compensate for skew, with low failure probability.…”

Section: Tree Clocking Networkmentioning

confidence: 99%

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A Comparative Study of SynchronousClocking Schemes for VLSI Based Systems

El-Amawy

Maheshwar

1993

VLSI Design

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Recently a novel clock distribution scheme called Branch-and-Combine(BaC) has been proposed. The scheme guarantees constant skew bound irrespective of the size of the clocked network. It utilizes simple nodes to process clock signals such that clock paths are adaptively selected to guarantee constant skew bound. The paper uses a VLSI model to compare the properties of the new scheme to those of the well established H-Tree approach. The H-Tree is a binary tree of simple buffers which is laid out such that leaves are at equal distances from the root. Our study considers clocking 2-D processor meshes of arbitrary sizes. We evaluate and compare the relevant parameters of both schemes in a VLSI layout context. We utilize parameters such as clock skew, link costs, node costs and area efficiency as the basis for comparison. We show that for each BaC network, there is a certain threshold size after which it outperforms the corresponding tree network in terms of skew. We also show that except for node costs, BaC networks outperform the H-Tree, especially when the size of the clocked network is large. As an extension we show that BaC clocking does not suffer from potential pulse disappearance, no matter how large the network is.

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Section: Tree Clocking Networkmentioning

confidence: 99%

“…The difference in arrival times is called clock skew. Different aspects of the clock skew problem have been studied in [8], [1], [2]- [6], [13]. The problem clock skew poses is that it directly relates to the clocking rate.…”

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confidence: 99%