The Essentials ofComputer(computer) 459

The Essentials ofComputer(computer) 459 - identifiable and...

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identifiable, and this is done by giving each of them a tag. The tag for each token identifies the instance to which it belongs. That way, tokens intended for, say, the third iteration, cannot cause nodes for the fourth iteration to fire. The architecture of a dataflow machine consists of a number of processing elements that must communicate with each other. Each processing element has an enabling unit that sequentially accepts tokens and stores them in memory. If the node to which this token is addressed fires, the input tokens are extracted from memory and are combined with the node itself to form an executable packet. The processing element’s functional unit computes any necessary output values and combines them with destination addresses to form more tokens. These tokens are then sent back to the enabling unit, at which time they may enable other nodes. In a tagged-token machine, the enabling unit is split into two separate stages: the matching unit and the fetching unit . The matching unit stores tokens in its mem-
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