PARALLEL COMPUTING WITH SPIN WAVES - Bio-Inspired and Nanoscale Integrated Computing - page 238

8.3.3. On Spin-Wave Fully Interconnected Cluster
The routing on a fully interconnected cluster is quite similar to the routing on a
spin-wave crossbar, except the fact that there are no switches on this architecture.
In addition, the fully interconnected cluster has an extra feature (which we explain
later in this section).
Similar to a crossbar, the concurrent receive feature applies here as well. At a
given frequency, a node can listen to multiple waves simultaneously. Using the
superposition property of waves, it receives the sum of all waves destined to it.
Consider the scenario where multiple senders send data to a node, for instance G,
at the same time. G receives the sum of those signals, providing that all the nodes
transmit on the frequency at which G's receiver is tuned.
Multiple broadcasting is possible here too. To distinguish the data being
transmitted to different nodes, transmissions are done at distinct frequencies, using
frequency division multiplexing. In a way, this is similar to having various radio
stations, each broadcasting at a different frequency. To listen to a specific station,
one tunes to the corresponding frequency. Figure 8.11 shows an example, where
node A is sending to a set of nodes, while C is sending to another set.
Note that since different senders broadcast to different sets on different
frequencies, the sets must be disjoint. However, as pointed out earlier, the fully
interconnected network has an additional feature that is different than the other two

f 1

A

L

B

K

C f 2

J D

I

E

H F

G

Figure 8.11. Multiple broadcasting on disjoint sets of receivers.