Synthesis Attribute Propagation Rules - 2022.1 English

Vivado Design Suite User Guide: Synthesis (UG901)

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2022.1 English

Read each individual attribute for the rules on whether it should be placed on hierarchies or signals.

In general, when an attribute is placed on a hierarchy, it affects only that boundary, and not the items inside that hierarchy. For example, placing a DONT_TOUCH on a specific level affects that level only, and not the signals inside that level.

There are some exceptions to this rule. These are DSP_FOLDING, RAM_STYLE, ROM_STYLE, SHREG_EXTRACT, and USE_DSP. When these attributes are placed on a hierarchy, they also affect the signals inside that hierarchy.