Converting Clock Gating to Clock Enable - 2021.2 English

UltraFast Design Methodology Guide for Xilinx FPGAs and SoCs

Document ID
UG949
Release Date
2021-11-19
Version
2021.2 English

If the code already contains clock gating constructs, or if it is intended for a different technology that requires such coding styles, Xilinx recommends that you use a synthesis tool that can remap gates placed within the clock path to clock enables in the data path. Doing so allows for a better mapping to the clocking resources; and simplifies the timing analysis of the circuit for data entering and exiting the gated domain. For example, use the -gated_clock_conversion auto option with Vivado synthesis to attempt automatic conversion to register clock enable logic. For the complex gated clock structures, use the GATED_CLOCK attribute in the RTL code to guide Vivado synthesis.