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The circuit diagram attached shows node values for initial and final vectors required to detect a possible slow-to-rise transition fault at the 1st AND gate output. As shown, Xs are assigned to PIs in the initialization vector phase as a result of which the capture cell input also goes to X...
Control path signals independent of data path would be a register block setting static configuration like enables and modes and are a common occurence in present-day designs. Whereas a status signal, say a CRC result, depends on parsing incoming data. Both kinds exist aplenty in present-day...
Hi Prokul,
You only get to see what the tool sees as datapath on a design-by-design basis (what are the instances, how are resources in them implemented, area, signal widths etc.), but dumping out files for the control and datapaths is not supported. RTL designs when coded mix the two most of...
Library cells can be divided into two when taking about tracks - standard cells (GP logic like AND/OR) and datapath cells (eg arithmetic blocks). The former have fixed height and variable width (thus the X2, X4 variants for AND gates you may have seen in the .lib which internally means they have...
Low LBIST coverage is a well-documented and researched fact, not subjective opinion based on random observations seen in a corporate project or two. Refer to countless LBIST-focused published papers and standard DFT texts (Abramovici, Wang etc) for more on that plus how large n-input circuits...
Why is LBIST test coverage low compared to deterministic pattern-based ATPG despite the fact that the most commonly used PRPGs are maximal length LFSRs and thus generate all 2^n possible (bar one) input combinations for an n-input combinational circuit?
Ultimately, ATPG patterns, though limited...
Lock up latches are used BOTH when one scan clock exists and skew is discovered post layout (i.e. not during scan insertion when skew is unknown) or between 2 scan clocks with skew in mixed scan-stitched chains. That is why lockups are automatically inserted by tools in these 3 cases where 2...
Skew is undeterministic b/w 2 async domains because the phase difference is not repeatable. Draw a 4ns and 6ns clock - consider them to be synchronous - and see how the waveforms start repeating after the 3rd/2nd cycle respectively. The same 4ns and 6ns clock if asynchronous would not have...
Lockups won't work b/w any 2 async domains whether on the scan or the functional path was the point. If they were, they would've been freely used on functional paths instead of the common 2d-flop synchronizer. Ergo, the only valid scenario for inserting lockups b/w 2 scan domains is for them to...
They don't use lockups in functional logic b/w asynchronous domains but synchronizers like 2-D flops (among other structures for multi-bit transfers). Phase difference b/w any two edges of async clocks is not guaranteed and so lockups are not exactly a reliable solution. Does this mean the 2...
So it turns out that level shifters are NOT required between 2 nearby same-voltage power domains which are themselves part of a top-level power domain having a different voltage, because apparently electrical design rules in the top-level PD will not be violated. However if the same 2 power...
Would appreciate some brainstorming on this question. Its an interesting question in my opinion, besides being important if we are to really understand why combos are so bad between 2 async domains.
By adding the latch, we only 'hope' to meet the hold time requirements of the capture flop by reducing the hold path length. If required the tool will probably still have to add a few delay buffers between the latch and the capture flop if hold analysis indicates violations in that path...
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