Intel® Quartus® Prime Standard Edition User Guide: Third-party Synthesis
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1.9.3.3. Input and Output Delays
Relationship Between tCO and the Output Delay |
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tCO = clock period – external output delay |
Relationship Between tSU and the Input Delay |
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tSU = clock period – external input delay |
When the syn_forward_io_constraints attribute is set to 1, the Synplify software passes the external input and output delays to the Intel® Quartus® Prime software using NativeLink integration. The Intel® Quartus® Prime software then uses the external delays to calculate the maximum system frequency.