Intel® Agilex™ F-Series and I-Series General-Purpose I/O User Guide

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ID 683780
Date 6/14/2022
Public
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6.1.5.2. Register Packing

The GPIO IP allows you to pack registers into the periphery to save area and resource utilization.

You can configure the full-rate DDIO on the input and output path as a flip flop. To do so, add the .qsf assignments listed in this table.

Table 50.  Register Packing QSF Assignments
Path QSF Assignment
Input register packing set_instance_assignment -name FAST_INPUT_REGISTER ON -to <path to register>
Output register packing set_instance_assignment -name FAST_OUTPUT_REGISTER ON -to <path to register>
Output enable register packing set_instance_assignment -name FAST_OUTPUT_ENABLE_REGISTER ON -to <path to register>
Note: These assignments do not guarantee register packing. However, these assignments enable the Fitter to find a legal placement. Otherwise, the Fitter keeps the flip flop in the core.

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