Versal devices power down unused/uninstantiated block RAM blocks at an 18 Kb granularity. Power gating is enabled on every 18 Kb block that is not instantiated in the design to save power. Power-gated 18 Kb blocks are not initialized during configuration and retain their house keeping value of zero. A valid bitstream is required for configuration and readback. Blank bitstreams are not allowed. The access to uninstantiated block RAM is prevented by disabling the internal operation.