Forum Discussion
yuxi1111
New Contributor
New ContributorLPM_counter have random values when power on
I would like to ask everyone a question: When using LPM_counter module, only the CLK count port was used, and no reset port was used. The product started running normally, but random values would ap...
FvM
Super Contributor
Super ContributorHi,
all core registers are reset by power-on reset. Is the respective counter clocked by an external clock already running during power-on or by a PLL generated clock? In the former case, it's likely to get inconsistent random counter values because POR isn't released synchronously. In the latter case, counter will hopefully start from zero after PLL clock start. If the counter isn't directly driven from a clk but internal logic, things are more complicated.
Generally, use synchronously released reset for all registers to avoid similar problems.
Regards
Frank
yuxi1111New Contributor
New ContributorAnd there are also many products that have not have problems .
