( ESNUG 589 Item 03 ) --------------------------------------------- [04/07/21]
Subject: Prakash's gotchas of serial mode vs. true multimode static sign-off
Virtual DAC'20 Troublemakers Panel
Cooley: Prakash. You had multimode Verix CDC and then you recently
announced something you call multimode DFT. What the hell is
multimode DFT?
Prakash: John, multimode is all over in various aspects of the functioning
of chips. We've been doing multimode in three different products
in three different ways.
For example, multimode CDC is about multiple clocking modes.
Multimode DFT is about multiple test modes. And multimode RDC
is about multiple reset scenarios.
Cooley: Oh, so you're not changing the clocking scheme during testing?
Okay, alright.
Prakash: What this is essentially a left-shift, right? Efficiency of
runtime and debug efficiency.
In multimode we run all modes simultaneously. That dramatically
reduces the set-up cost, and it reduces the runtime cost.
And I mentioned that we also leverage hierarchy and abstraction
to speed up.
This is where the engineering customization enters the picture
because multimode abstractions are an order of magnitude more
complex than single-mode abstractions.
And then as far as the advantage in reporting is concerned, even
if a failure affects multiple modes, it gets reported only once.
So, you get a dramatic compression in the amount of debug work
that the engineers have to do. Again, run it faster, make it
easier to use.
Then the last thing where multimode is most important is that it
provides the complete coverage, which is the goal.
For example, if you run single-mode CDC multiple times you have
a potential of missing crossings and data and clock endpoints,
which will not happen with multimode CDC.
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Serial mode CDC analysis can miss clock crossing errors
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So, all the three dimensions of completeness, efficiency as far
as the runtime goes, and efficiency of debug. The next dimension
in providing those is by going to multimode solutions, after
hierarchy and debug design for single mode solutions.
Cooley: Okay, cool. Thank you.
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