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10 Other Supported Technologies
ToPoliNano was developed to support different technologies in one tool. Up to
now it enables the study of NanoMagnet Logic and NanoArray, a promising tech-
nology that is briefly outlined in what follows. The NanoArray architecture is
based on an intense research activity aimed at understanding the emerging nan-
otechnological devices and their constraints of realization. A NanoArray project
is hierarchical, consisting of interconnected tiles that determine the architecture
(Fig. 23 ) and it is optimized to meet the various constraints that come from the
construction process, from materials and devices.
Fig. 23. Example of NanoArray made by Silicon Nanowires (SiNW) and SiNW FETs.
Among the devices that NanoArray architecture can use, there are FETs
or diodes in 2-D structures based on crossed SiNWs to realize logical functions
(Fig. 23 ); the various types of optimizations to overcome the limitations imposed
by the layout, by the constructive process and by defects adopted in this app-
roach differ from those enforced by other architectures.
The logic AND-OR (or equivalent according to DeMorgan) is carried out
either statically, or dynamically. In a dynamic circuit style pipelining of circuits
becomes possible. Signals like GND, Vdd, Vss and dynamic control signals neces-
sary for operation are transported at micrometric scale by so-called microwires.
The defects are masked directly into the circuit or architecture, without recur-
ring to reconfigurability. The peculiarities of this approach can be summarized
in four points:
- redundancy is added in each stage of AND-OR logic and outputs, in addition
to the dual-rail redundancy; signals are intercalated and then combined as
part of the AND & OR logic planes;
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