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Redges, Fedges, Tigers & Bears (Page 3 of 11)
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Potential Challenge: Trans-temporal integrity and coherence
Sounds impressive huh? Right up there with "Tacion Fields!"
Trans-temporal integrity is simply the aspect of guaranteeing the successful transition of information across clock (temporal) domains.
Single-bit signals, can be taken through two (destination domain clocked) flip-flops to remove, actually SEVERELY diminish the likelihood of, metastable events.
Trans-temporal coherence is the aspect of moving more than one bit of information across temporal (clock) domains while retaining the original multi-bit-wide information. This requires additional planning and logic, since simply double clocking n-bit wide registers won't accomplish the task.
Example: Using two stages of 3-bit flip-flops could likely move a 101 from "Domain A" to "Domain B" first, incoherently, possibly as 100, then eventually as 101. See the problem? For a time, "Domain B" sees a value that NEVER existed in "Domain A." Potentially, a problem situation.
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