Abstract: In some embodiments a memory rank idle counter enables de-assertion of a clock enable signal of a rank of a memory for idle systems. Clock enable signal assertion is maintained when there is a lot of traffic to the memory rank. A memory rank idle time prediction counter transfers a value to the memory rank idle counter when the memory rank is idle. Other embodiments are described and claimed.

Abstract: According to one embodiment, a memory controller is disclosed. The memory controller includes a scheduler to schedule memory transactions to the DIMM and a write address queue to accumulate the write requests while the memory controller is operating in a first mode and to release the write requests to the scheduler whenever the memory controller is operating in a second mode.

Abstract: In some embodiments, a method, apparatus and system to generate an interrupt by monitoring an external interface are presented. In this regard, an interrupt agent is introduced to communicate over a serial interface with an input/output (I/O) extender and to save a relevant status of the I/O extender in a memory. Other embodiments are also disclosed and claimed.

Abstract: In some embodiments, a method, apparatus and system to generate an interrupt by monitoring an external interface are presented. In this regard, an interrupt agent is introduced to communicate over a serial interface with an input/output (I/O) extender and to save a relevant status of the I/O extender in a memory. Other embodiments are also disclosed and claimed.

Abstract: In a multi-node system, a method and apparatus to implement a locked-bus transaction is described. In one embodiment, a bus agent initiates a locked-bus transaction and a node controller defers the transaction so that it will be initiated again at a later time. The node controller then sends the locked bus request to one or more other node controllers in the system, which prevent bus transaction at their respective busses. Once the requesting node controller receives confirmation that the other nodes are locked, it can allow the locked-bus transaction to proceed from the bus agent.