2128 - Diamond / Synplify Pro: Does the warning "@W:MT246 Blackbox EHXPLLJ is missing a user supplied timing model" have any negative effect on the timing analysis and optimization, or the Quality of Results?
Description:
In Diamond and when using Synplify Pro as the synthesis tool, this warning "@W:MT246 Blackbox EHXPLLJ is missing a user supplied timing model" can occur when performing synthesis with an instantiation of any IP core using IPexpress.
Solution:
The Synplify Pro synthesis tool does not have access to the the Lattice IP core. This is the primary reason for these warnings and they can be safely ignored. However during the PAR process, the Lattice tool will consider the timing model of the block (example, PLL) and will perform the PAR operation accordingly. So, it will not have any effect on timing analysis and optimization or the Quality of Results as long as the IP modules are available during PAR.