[f-cpu] Eurêka !

[Yann Guidon <whygee@f-cpu.org>]

hi !

so the idea struck me while i was in the bath :
the BIST unit. In the landscape of the FC0 it really
looks like an execution unit but it not used by any
instruction. It has 3 read ports and 2 write ports,
it is connected like any other EU to the Xbar but it
benefits from specific bypass paths inside the Xbar.
It is therefore capable of testing several units
at the same time :-) [while writing to a unit,
it can read from another unit].

Ok i know, the controlling FSM will not be really funny
to write. but when it comes to the rest,
this bath has given me inspiration :-)

i'll try to write a draft soon.

WHYGEE
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