For applications which use a custom software stack which cannot leverage Xilinx provided power management framework or not interested in active runtime power management, but still looking for an efficient low power design, here are a few techniques that might be useful:
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https://xilinx-wiki.atlassian.net/wiki/spaces/A/pages/1416692184
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https://xilinx-wiki.atlassian.net/wiki/spaces/A/pages/1417150870