Tomoko Ogura

Twin MONOS: a nitride based dual bit flash memory

Twin MONOS is a CMOS-based dual bit nitride storage flash memory technology which offers low cost, high performance and low power.

Silicon Nanowire Transistors for Implementing an Field Programmable Gate Array Architecture with Scan Chain

This study presents a Field Programmable Gate Array (FPGA) architecture that uses vertical, undoped silicon nanowire transistors with metal gates and utilizes scan chain approach to minimize wiring channels. The study starts with a brief description of the nanowire transistor, its SPICE model with RC parasitics, and continues with an in-depth analysis of circuit performance and power dissipation of CMOS nano-circuits used in this particular FPGA architecture. The device design cycle optimizes both the NMOS and PMOS nanowire transistors for minimal dynamic power dissipation. Each transistor is modeled using BSIMSOI; parasitic resistance and capacitance values are extracted for SPICE simulations. FPGA is composed of cluster blocks, each of which contains three 4-input Look-Up-Tables (4-LUT). Each 4-LUT can be programmed to implement either combinatorial logic or state machine. Scan chains are used to program a specific logic function for each 4-LUT, to define data-paths in a cluster and between clusters and to reduce wiring channels. Inter-cluster communication is established by an 8-bit wide data bus and 4 shared switch boxes placed at each corner of a cluster. Worst-case propagation delay for a 4-LUT is 20.8 ps from its clock input to its output; the worst-case inter-cluster wire delay is 4.8 ps between 2 diagonally adjacent clusters and 11.2 ps between 2 diagonal clusters placed at 4 cluster lengths away. Worst-case dynamic power dissipation of a 4-LUT is 2.8 μW if there is no overlap between selector inputs to a 4-LUT and increases by 60 nW/ns of overlap at 10 GHz. FPGA layout contains silicon nanowire transistors placed in a fabric matrix where each NMOS (PMOS) transistor has 4 neighboring PMOS (NMOS) transistors and occupies approximately 0.16 cm 2 .