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"the logic value of DB2 maybe incorrect but won't be metastability"
Yeah that i understood, but how does it serve the purpose of signal integration? I mean DB2 may or may not have same but delayed pulses as DA always.
If this solution is something not completely full proof, then i got the answer.
The CLKA is toggling at a higher frequency than CLKB, trying to sample a pulse that doesn't span at least 1 clock cycle of the capture clock (CLKB) is prone to missing the pulse completely. As was mentioned in another post sending a pulse is usually done with something that is more like 2-3 clocks wide in the capture clock domain.