Good article: https://blog.asset-intertech.com/test_data_out/2014/11/memory-training-testing-and-margining.html https://blog.asset-intertech.com/test_data_out/2

Good article: https://blog.asset-intertech.com/test_data_out/2014/11/memory-training-testing-and-margining.html https://blog.asset-intertech.com/test_data_out/2014/11/memor... Basically it's the memory chip bring up procedure of the memory controller. It figures out what kind of ram is on the bus, configures and even tests it so it's ready for use.