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Altera_Forum's avatar
Altera_Forum
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14 years ago

Some bits in reg are disappeared!

I wrote a project at Quartus II 9.1.But the resulst is always wrong.I fond some bits in some registers are disappeared!For instance the are only 6 bits in reg [7:0] max_value, 2 bits are disappeared!...
Altera_Forum's avatar
Altera_Forum
Icon for Honored Contributor rankHonored Contributor
14 years ago

--- Quote Start ---

Try a clear question. Where are you missing the register bits? In a simulation, in Signal Tap output?

The most likely explanation is, that the bits are not used in the design and have been discarded, or the signals are not present at the place, where you try to tap them.

P.S.: Please avoid cross postings.

--- Quote End ---

I'm sorry for cross postings.

The error appears in Signal Tap output.

Because the result of the project is not right,I add some items to Signal Tap to find the place where the error occurs.I found the missing register bits. But when I connect it to a output pin,in fact I don't want this output pin,no missing register bits occurs again. And the result of the whole project is right also.

Thanks