Closing the Gap Between ASIC & Custom: Tools and Techniques by David Chinnery

By David Chinnery

By means of Kurt Keutzer these trying to find a short evaluate of the publication should still fast-forward to the advent in bankruptcy 1. What follows is a private account of the construction of this publication. The problem from Earl Killian, previously an architect of the MIPS processors and at the moment leader Architect at Tensilica, used to be to provide an explanation for the numerous functionality hole among ASICs and customized circuits designed within the comparable strategy iteration. The relevance of the problem was once amplified almost immediately thereafter through Andy Bechtolsheim, founding father of solar Microsystems and ubiquitous investor within the EDA undefined. At a dinner speak on the 1999 overseas Symposium on actual layout, Andy said that the best near-term chance in CAD was once to boost instruments to carry the functionality of ASIC circuits in the direction of that of customized designs. There appeared to be a few synchronicity that participants so diversified in challenge and personality will be pre-occupied with an identical challenge. Intrigued by means of Earl and Andy’s reviews, the sport was once afoot. Earl Killian and different veterans of microprocessor layout have been beneficial with clues as to the resources of the functionality discrepancy: format, circuit layout, clocking technique, and dynamic common sense. I quickly learned that i wanted assist in monitoring down clues. in basic terms at a superb establishment just like the collage of California at Berkeley may I so simply commandeer an ab- bodied graduate pupil like David Chinnery with an information of structure, circuits, computer-aided layout and algorithms.

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2nd Ed. Morgan Kaufmann, 1996. , et al. 18-um CMOS IA-32 Processor With a4-GHz Integer Execution Unit,” IEEE Journal of Solid-State Circuits, vol. 36, no. 11, November 2001, pp. 1617-1627. , “The Future of Wires,” Proceedings of the IEEE, vol. 89, no. 4, April 2001, pp. 490-504. , “The Optimal Logic Depth Per Pipeline Stage is 6 to 8 FO4 Inverter Delays,” Proceedings of the Annual International Symposium on Computer Architecture, May 2002. 0, 2000. 5, May 1998. pp. 807811. , “The Alpha 21264 Microprocessor Architecture,” Proceedings of the International Conference on Computer Design, 1998, pp.

This gives maximum delay for the following logic of Each latch stage takes about T/2 to compute, including the propagation delay through the latch. The flexibility in the time window for a latch’s input arrival allows slack passing and time borrowing between pipeline stages. Slack passing and time borrowing allow some stages to take longer than T/2, if other stages take less time. If the output of a stage arrives early within this time window, the next stage has more than T/2 to complete – slack passing.

Then be the average combinational delay per latch pipeline The term can be replaced by the n-cycle-to-cycle jitter averaged across n cycles, if the jitter for n clock cycles is known. The same limit holds for the clock period of a long sequential path. 5 Latch Clock Period bounded by a Sequential Path Consider an input, with arrival time to a critical sequential path with latches. The input may be from a register or from a primary input of the circuit. e. the output of the sequential path doesn’t arrive with plenty of time to spare).

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