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Dynamically pulsed MTCMOS with bus encoding for total power and crosstalk minimization

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5 Author(s)
Deogun, H.S. ; Dept. of Electr. Eng. & Comput. Sci., Michigan Univ., Ann Arbor, MI, USA ; Rao, R. ; Sylvester, D. ; Brown, R.
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Increased buffer insertion along on-chip global lines and the increasing contribution of leakage power have resulted in buffer leakage emerging as one of the chief contributors to system leakage power. We present a novel power-gating scheme for repeaters on global bus lines that address the pressing problem of runtime leakage while simultaneously eliminating worst-case capacitive coupling between adjacent bus lines. We propose using a pulsed MTCMOS (multiple threshold CMOS) scheme that dynamically activates the bus system only when transmitting a signal. Additionally, a bus encoding scheme is used to eliminate worst-case coupling and thereby negate the power-gating and pulse generation performance penalty. We consider all sources of delay and leakage power, including that of the MTCMOS control circuitry. This technique can result in nearly a 30% reduction in total bus system power for low switching activities and up to 2.3 times reduction in standby mode leakage with no reactivation delay penalty.

Published in:

Quality of Electronic Design, 2005. ISQED 2005. Sixth International Symposium on

Date of Conference:

21-23 March 2005

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