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Valued Contributor III
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Altera LVDS SERDES TX timing

Hi, 

 

How can I constrain output_delay for a parallel bus driven by a LVDS serdes? I'm trying to do something similar to this: https://www.altera.com/support/support-resources/design-examples/design-software/timequest/exm-tq-ca... but my "create_generated_clock" constraint for the output_clock fails due to incorrect source (I've tried get_nets on the tx_outclock and generating the clock as a data output and using get_pins on the DDIO register output). 

 

The ug_altera_lvds document suggest to analyse I/O timing by looking at the TCCS report, but this number does not take into consideration the target device's setup and hold requirements.  

 

By using twentynm_ddio_out to generate my 216MHz, 16-bit parallel, source-synchronous DDR output interface I am not even close to meet timing on an Arria 10 GX. 

 

Is it possible to use "set_output_delay" to constrain this interface? If not, how can it be constrained?
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