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A macro component is an agregation of components put together in order to create a new
one. This type of definition is base for hierarchical platforms definitions.

= Usage =

Let's start with an example defining a cluster for a clustered SoC:

{{{

}}}

Once declared, we may instanciate a cluster with this line:
{{{
}}}
The declared macro component exports some variables, they will
probably be useful for later use:
 * `cluster.interconnect` The interconnect
 * `cluster.cpu` A list of the cpus in this cluster
 * `cluster.cram` A list of the cached rams in this cluster
 * `cluster.uram` A list of the uncached rams in this cluster
 * `cluster.lock` The RamLocks component instanciated in this cluster