A MEMORY SYSTEM

摘要

Provided are a method and apparatus for using a pre-clock enable (pre-CKE) command for power management modes. A host memory controller sends a pre-CKE command to a memory module over a bus indicating at least one power management operation to perform. The host memory controller further asserts a clock enable (CKE) signal to the memory module over the bus after sending the pre-CKE command to cause a memory module controller to execute the indicated at least one power management operation in response to the CKE signal.