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In the conventional ASIC design flow, slew constraints are imposed on clock sinks and clock buffers uniformly. The slew constraint has a significant affect not only on the timing but also on power in high performance designs. This paper investigates relaxing tight slew constraints for the reduction of low-impact buffers in clock trees. This is motivated by the observation that buffers in a clock tree that...
A novel clock mesh generation method is proposed based on the EMDg (Earth Mover's Distance under transformations) algorithm. A bottom-up approach is adopted in creating local-level tree clusters to drive the generation of a regional-level uniform clock mesh. The EMDg method incrementally moves the regional-level uniform clock mesh closer to the register cluster roots in order to reduce the total stub...
Resonant rotary clocking is a clocking technology for high frequency clock generation and distribution at a low power dissipation rate. It is commonly conceived that the multiple phases on the rings of the rotary oscillatory array (ROA) necessitate a non-zero clock skew operation. In this paper, the feasibility of zero clock skew synchronization with the rotary clocking technology implemented on the...
Rotary clocking is a traveling wave based high-speed resonant clocking technology with low-power and controllable-skew properties. Capacitive load balance and bounded clock skew are identified as the primary requirements to maintain a stable oscillation frequency across the rings and to achieve timing closure, respectively, in the rotary oscillatory array (ROA). Towards this end, two methodologies...
The square wave generated from the rotary operation with adiabatic switching is a continuously traveling wave, which provides multiple phases of the clock signal on the rotary ring. Recent research in the design automation of rotary clocking implementation has adopted some simplifications of the phase assignments for scalability. Towards this end, the design techniques, employed in conventional IC...
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