8.4.3. Interconnection architectures
The interconnection architectures can be divided into two categories: direct and indirect. In the former architecture, FPGA or ASIC chips are connected to each other directly through a fixed set of physical wires. In the latter architecture, dedicated routing chips are used to connect the chips, which relieves the computing units of inter-chip routing.
8.4.3.1. Direct interconnection
Because the computing units are usually arranged in a 2D array structure, the 2D-mesh-type direct interconnection architecture is an apparent choice. However, for the simple 2D-mesh interconnection scheme in Figure 8.19a, the valuable I/O pins may be used up by global interconnects routed through several computing units. In ...
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