JEDEC announced the publication of the JESD304-4.01 DDR4 NVDIMM-P Bus Protocol. The standard will enable the industry to create advanced memory solutions that benefit from the enhanced system performance and novel data availability offered by Persistent Memory devices. The new standard will provide an interface of the lowest latency to emerging memory, and offering flexible support for varied Persistent memory media characteristics and use cases. It also provides a full transactional interface protocol compatible with standard DRAM DIMMs and a firmware programming model for the modules.
Source: https://www.helpnetsecurity.com/2021/02/19/jedec-jesd304-4-01-ddr4-nvdimm-p-bus-protocol/