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Performance Benefits of Monolithically Stacked 3-D FPGA

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4 Author(s)
Mingjie Lin ; Dept. of Electr. Eng., Stanford Univ., CA ; El Gamal, A. ; Yi-Chang Lu ; Simon Wong

The performance benefits of a monolithically stacked three-dimensional (3-D) field-programmable gate array (FPGA), whereby the programming overhead of an FPGA is stacked on top of a standard CMOS layer containing logic blocks (LBs) and interconnects, are investigated. A Virtex-II-style two-dimensional (2-D) FPGA fabric is used as a baseline architecture to quantify the relative improvements in logic density, delay, and power consumption achieved by such a 3-D FPGA. It is assumed that only the switch transistor and configuration memory cells can be moved to the top layers and that the 3-D FPGA employs the same LB and programmable interconnect architecture as the baseline 2-D FPGA. Assuming they are les 0.7, the area of a static random-access memory cell and switch transistors having the same characteristics as n-channel metal-oxide-semiconductor devices in the CMOS layer are used. It is shown that a monolithically stacked 3-D FPGA can achieve 3.2 times higher logic density, 1.7 times lower critical path delay, and 1.7 times lower total dynamic power consumption than the baseline 2-D FPGA fabricated in the same 65-nm technology node

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Computer-Aided Design of Integrated Circuits and Systems, IEEE Transactions on  (Volume:26 ,  Issue: 2 )