By Lam, Tak-Kei
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Additional resources for Boolean circuit rewiring : bridging logical and physical designs
Recall that in FIRE, we first assign uncontrollability value ¯0 and then ¯1 to the target wire wt and perform implications. The set of gates having uncontrollability or unobservability values assigned as a result of the implication of wt = ¯0 is S(wt = ¯0), and the set of gates having uncontrollability or unobservability values assigned as a result of the implication of wt = ¯1 1). The information of the two sets of gates S(wt = ¯0) and S(wt = ¯1) is then used is S(wt = ¯ to determine the redundant wires in the circuit.
This rewiring algorithm performs rewiring by first adding an alternative wire wa to the given circuit, and then performing a FIRE redundancy test on wa . The set of untestable faults F (wa = ¯0) and F (wa = ¯1) are obtained. Finally, the target wires wt that have become redundant after addition of the alternative wire can be identified. Boolean Circuit Rewiring 18 Compared to RAMBO, RAMFIRE needs no redundancy test for every wire. Therefore, besides REWIRE, RAMFIRE is also substantially faster than RAMBO.
23. Having understood the idea of SPFD and the mechanism of using it to manipulate function flexibility, the mechanism of alternative wire identification can be explained as a redistribution of SPFDs. 24. The removal of the target wires results in the inequality between the SPFDs of the inputs and Boolean Circuit Rewiring 30 the SPFD of the output of gate g; some pairs of functions in SP F Dg cannot be distinguished. The function implemented by gate j is found to be able to distinguish the unsatisfied pairs of functions.
Boolean circuit rewiring : bridging logical and physical designs by Lam, Tak-Kei