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This article investigates pin accessibility problem of standard cells designed with a sub-20nm technology. The 15nm open cell library from NanGate and three of its variants with a reduced number of access points per pin based on FreePDK15 are used for our study. Our experiments show that a standard cell library is viable when the number of access points per pin is not less than three.
This paper proposes a two-stage transistor routing approach that synergizes the merits of channel routing and integer linear programming for CMOS standard cells. It can route 185 cells in 611 seconds. About 21% of cells obtained by our approach have smaller wire length than their handcrafted counterparts. Only 11% of cells use more vias than their handcrafted counterparts. Our router completes routing...
Effective algorithms have been invented for post-routing redundant via insertion (RVI). However, implementations of these algorithms often ignore some practical issues. In this article, we implement a post-routing RVI algorithm that takes into account interconnect contexts during RVI. Experimental results show that our context-aware RVI on average raises via1 (vias between metal layer 1 and 2) insertion...
In this paper we propose a synergetic approach that integrates router design and cell library engineering for improving post-routing via1 (via between M1 and M2) doubling rate at pins. We develop a double-via (DV) aware multilevel router to exploit the via1 doubling possibilities provided to the cells in a conventional as well as a DV-driven cell library. Compared to a non-DV-aware router using a...
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