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Altera_Forum's avatar
Altera_Forum
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11 years ago

analysis and optimization problem

Hello every body; During the analysis and optimization of my project on Quarts 12, I found that there are some registers are removed and the reason are " Stuck at GND due to stuck port data_in "...
Altera_Forum's avatar
Altera_Forum
Icon for Honored Contributor rankHonored Contributor
11 years ago

As I just replied in the other thread, this occurs when a register is stuck at a specific value. Have you forgotten to connect a clock? or connected a clock enable to '0'?

You can use the SYN_KEEP attribute to prevent it removing registers, but this is onyl for register you KNOW this message will occur for (like when you're putting in logic you only want connected to signaltap.