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Clock grid is a mainstream clock network methodology for high performance microprocessor and SOC designs. Clock skew, power usage and robustness to PVT (power, voltage, temperature) are all important metrics for a high quality clock grid design. Tree-driven-grid clock network is a typical clock grid clock network. It includes a clock source, a buffered tree, leaf buffers, a mesh clock grid, local...
This paper compares and contrasts two common clock distribution styles: clock grids, the preferred microprocessor distribution style, and clock trees, the preferred ASICs distribution style. After a high level description of the routing methodologies for clock grids and clock trees, a case study is presented to compare the performance and cost trade-off of grids and trees. Our results show that clock...
Design automation tools for ESD are described that ensure robust protection at both the cell and chip level in a high-volume, highly automated ASIC design system. The Charged Device Model (CDM) failure modes discovered in the 130nm technology are described, and the design automation tools that were implemented to prevent these failures are presented. There are three primary components: Design rule...
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