temperature influence in FPGA

[johnsean.wu]

Hi,all~
There is a project in hand , and we use ALTERA FPGA .When the system is finished ,it can work in normal temperature ,and we take temperature test , the FPGA temp. range is -40-85c. When is some point temperature such as 60c ,the system will die ,and any others temperature in the scope is OK. Can anyone help me please?

 

[TrickyDicky]

Did you put a set of timing specs on the design when you compiled it?

 

[johnsean.wu]

The highest frequency is 75MHz, and I think there needn't to timing constrains.

 

[TrickyDicky]

the timing constraints would have assessed the design over the full temperature range before you even programmed the chip. I suspect you're in a situation where you've been getting away with it. I highly suggest you write some and run the timing analyser when you next recompile the design.

 

[std_match]

The highest frequency is 75MHz, and I think there needn't to timing constrains.

You must always use timing constraints for synchronous designs. There is no "safe" frequency.

 

[sivamani]

Apart from timing u can also cross check the power requirement at high temperature and weather your supply input is capable of supplying required power or not.

 

[TrickyDicky]

deleted - I didnt read!

 

[johnsean.wu]

OK ,Thanks a lot ，It seems to know something~