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Posts Tagged ‘capacitance’

Custom Compiler In-Design Assistants (Part 3)

Tuesday, September 20th, 2016

In the blog ‘Custom Compiler In-Design Assistants (Part 2)’, I outlined how we can use StarRC to report capacitances on critical nets in the layout even when the design is still in flux and not completely LVS-clean. In addition to capacitance reports, we also showed resistance reporting which is critical for FinFET-based layouts. At advanced nodes, the impact of parasitics, electromigration (EM) and restricted design rules drive critical layout choices. Interconnect that does not meet resistance, or EM criteria and unbalanced capacitances on matched nets, can and often does adversely impact layout schedules. So the earlier in the layout phase the layout engineer can address these issues, the sooner he or she can close the design.

EM in particular is a notorious problem in the FinFET process due to the high drive of the transistors and thin metals. So let’s say, for example, the layout engineer has to route a critical net which could be susceptible to the impact of EM. This is a non-trivial task that could be quite challenging. However, if you use Custom Compiler, there are some very cool capabilities that make laying out interconnect that meets EM criteria very quick and very easy.

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Custom Compiler In-Design Assistants (Part 2)

Thursday, July 14th, 2016

Planning which metal shape goes on which color (mask) is key when designing in a FinFET process, especially when propagating connections through the layout hierarchy. In addition, highly matched signals such as complementary clocks must be assigned to the same color, as routes on different masks have different resistances. So how do we ensure we are keeping things in order with respect to the matching of resistance and capacitance?

Custom Compiler’s In-Design assistants include a built-in engine that computes resistance of a net from a single source to a single destination or multiple destinations. It is an interactive tool that can be run often during the layout process, has a simple use model and a fast response time. To report the resistance of a net, the layout engineer simply selects the net of interest from either the layout, the design navigator or the schematic. The next step is to invoke the resistance report command which pops up in the electrical report menu. The report type is set to “Resistance” and the source and destination points are entered.  The report is run and the results are populated in the Electrical Reporter pane.
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