timing constraints

In the cyclone devices, How to set parameters like tco,tsu,th,tpd.I am not using any M4K RAMS or DSP blocks.I am using for LE_FF timing and LVTTl standards.I am not using fast corner analysis.I have to fix up hold violations of no 96 I referred cyclone II device data sheet DC and timing characteristics page 106-135.How to set this paramters.There are no examples for this.Can you provide examples for this.If you provide examples for this in assignment editor ,it will be useful for users kumar

Reply to
ram
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In the cyclone devices, How to set parameters like tco,tsu,th,tpd.I am not using any M4K RAMS or DSP blocks.I am using for LE_FF timing and LVTTL standards.I am not using fast corner analysis.I have to fix up hold violations of no 96 I referred cyclone II device data sheet DC and timing characteristics page 106-135.How to set this paramters.There are no examples for this.Can you provide examples for this.If you provide examples for this in assignment editor ,it will be useful for users kumar

Reply to
ram

Kumar,

Please look at

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Based on your baord requirements, you need to first spec your I/O timing requirements, and once you have them, you can use the assignment editor to enter the assignment. The document should help you understand the assignments for you to figure out your spec.

As for an example for the assignment editor, here is one for Tsu

- From Column: You can either enter the clock reference or leave empty

- To Column: Enter the name of the pin you want to constraint

- Assignmane Name: "Tsu Requirement"

- Value:

When you are done, click "Start Timing Analysis" and you should see the Tsu report show slack.

In your QSF file, you will see something like

set_instance_assignment -to mypin -name TSU_REQUIREMENT "5 ns"

Hope this helps,

-David Karchmer Altera

ram wrote:

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dkarchmer

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