Similar to the overflow-status-functionality (which I missused in the picture below) it would be useful to make it possible to include handshaking bit(s) in the signal as well. It is true that this could be implemented using a cluster. However the additional cluster-level will imply a multiplication of type definitions; moreover a built in handshaking-bit-functionality could be included directly in the high-speed math functions an registers, so that a seperate 'output valid' terminal would not be necessary.
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