Stick diagram of a monolithic crossbar see colour plate

The main problem associated the 2-D crossbar implementation is its poor scalability. For an NxN crossbar, the layout area increases with 0(N2), while 

With the 2.5-D stacking technology, we are able to construct a more efficient packing for the crossbar circuit. In the 2.5-D layout with two stacked chips, each chip will route half input and output wires as shown in Fig. 3.2. Now every source region (connected to an input line) is shared by two abutted pass-gates. In 

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Figure 3.1 Stick diagram of a monolithic crossbar (see colour plate)...

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