Library developers are facing increasing challenges at the 65nm and 45nm nodes, including increasing design rule complexity, time-to-market pressures, library richness, and late design rule changes. Manual layout is becoming increasingly impractical and expensive. The Cadabra® product offers a fully automated tool for the creation of standard cells layouts from SPICE netlists, and for migration of existing standard cell layouts to new design rules or architectures. With easy to use graphical interfaces and results that rival hand-crafted, the Cadabra product is the market leader in automated standard cell layout.
Design Rule Complexity
With advanced manufacturing processes, the number of design rules that must be enforced for each layer is increasing rapidly. Moreover, many of the newer design rules are complex rules that are difficult to visualize, forcing manual layout designers into an iterative flow of layout, design rule checking and correction. The Cadabra product supports a wide range of advanced rules, including common run and/or width dependant rules, edge length rules, and table-based rules.
The Cadabra product also offers a wide range of capabilities for improving the manufacturability and robustness of standard cell libraries. Preferred rules are natively supported, making optimal use of slack space in the cell layout to improve robustness without sacrificing density. Automatic corner minimization facilitates optical proximity correction (OPC) processing and reduces data volume. Electromigration robustness is also handled automatically, with widths increased and redundant contacts placed on high-current paths.
As library design challenges are increasing, manual layout becomes the bottleneck and is no longer a viable solution. Layout automation is the key to meet your time-to-market requirements and remove the library from the critical path to access a new process technology.
The Cadabra product is optimized for parallel batch processing on a network of computers to allow rapid turnaround time and can interface with many popular job management systems.
To get the most from a manufacturing process, it is common to create two or more libraries at each process node to address different design goals (high speed, low power, etc). Furthermore, synthesis tools benefit from a richer selection of functions and drive strengths. This demand for more, larger libraries puts additional pressure on library development teams and heightens the need for layout automation.
Late Design Rule Changes
As manufacturing technologies advance, it is becoming increasingly common for design rules to be updated after library development has started, or even after it has finished. The Cadabra productís migration technology allows design rule changes to be incorporated quickly and easily, even in layouts which have been manually optimized.
product:Synopsys Cadabra 2008.09 Linux