System and Method for Reducing Power Consumption of Memory

Abstract

Systems and methods for reducing problems and disadvantages associated with power consumption in memory devices are disclosed. In accordance with one embodiment of the present disclosure, a method for improving performance and reducing power consumption in memory may include tracking whether individual units of a memory system are active or inactive. The method may also include placing inactive individual units of the memory system in a self-refresh mode, such that the inactive individual units self-refresh their contents. The method may further include placing active individual units of the memory system in a command-based refresh mode, such that the active individual units are refreshed in response to a received command to refresh their contents.

1 . A method for improving performance and reducing power consumption in memory, comprising:
 tracking whether individual units of a memory system are active or inactive;   placing inactive individual units of the memory system in a self-refresh mode, such that the inactive individual units self-refresh their contents; and   placing active individual units of the memory system in a command-based refresh mode, such that the active individual units are refreshed in response to a received command to refresh their contents.   
     
     
         2 . A method according to  claim 1 , wherein an individual unit of the memory system comprises one of a block, a page, a bank, and a rank. 
     
     
         3 . A method according to  claim 1 , wherein:
 each individual unit of the memory system comprises a page;   tracking whether individual units of a memory system are active or inactive includes tracking whether individual pages are active or inactive; and   placing inactive individual units of the memory system in a self-refresh mode includes placing banks having only inactive pages in a self-refresh mode, such that such banks self-refresh their contents.   
     
     
         4 . A method according to  claim 1 , further comprising setting at least one variable indicating which individual units of the memory system are to be placed in the self-refresh mode, and which individual units of the memory system are to be placed in the command-based refresh mode. 
     
     
         5 . A method according to  claim 4 , wherein the at least one variable is stored in a table such that an entry of the table is associated with an individual unit of the memory system and indicates whether such individual unit of the memory system is to be placed in self-refresh mode or command-based refresh mode. 
     
     
         6 . A method according to  claim 4 , wherein the at least one variable indicates a fraction of the individual units of the memory system to be placed in self-refresh mode. 
     
     
         7 . A method according to  claim 6 , wherein the at least one variable is stored as a field in a mode register of the memory system. 
     
     
         8 . An information handling system, comprising:
 a processor;   a memory system communicatively coupled to the processor and having:
 individual units for storage of data; and 
 a memory controller communicatively coupled to the individual units and configured to:
 track whether the individual units are active or inactive; 
 place inactive individual units in a self-refresh mode, such that the inactive individual units self-refresh their contents; and 
 place active individual units in a command-based refresh mode, such that the active individual units are refreshed in response to a received command to refresh their contents. 
 
   
     
     
         9 . An information handling system according to  claim 8 , wherein an individual unit of the memory system comprises one of a block, a page, a bank, and a rank. 
     
     
         10 . An information handling system according to  claim 8 , wherein:
 each individual unit comprises a page;   tracking whether individual units active or inactive includes tracking whether individual pages are active or inactive; and   placing inactive individual units in a self-refresh mode includes placing banks having only inactive pages in a self-refresh mode, such that such banks self-refresh their contents.   
     
     
         11 . An information handling system according to  claim 8 , further comprising setting at least one variable indicating which individual units are to be placed in the self-refresh mode, and which individual units are to be placed in the command-based refresh mode. 
     
     
         12 . An information handling system according to  claim 11 , wherein the at least one variable is stored in a table such that an entry of the table is associated with an individual unit and indicates whether such individual unit of the memory system is to be placed in self-refresh mode or command-based refresh mode. 
     
     
         13 . An information handling system according to  claim 11 , wherein the at least one variable indicates a fraction of the individual units to be placed in self-refresh mode. 
     
     
         14 . An information handling system according to  claim 13 , wherein the at least one variable is stored as a field in a mode register of the memory system. 
     
     
         15 . A memory system, comprising:
 individual units for storage of data; and   a memory controller communicatively coupled to the individual units and configured to:
 track whether the individual units are active or inactive; 
 place a first region including only inactive individual units in a self-refresh mode, such that the individual units of the first region self-refresh their contents; and 
 place a second region including active individual units and inactive individual units in a command-based refresh mode, such that the individual units of the second region are refreshed in response to a received command to refresh their contents. 
   
     
     
         16 . A memory system according to  claim 15 , wherein an individual unit of the memory system comprises one of a block, a page, a bank, and a rank. 
     
     
         17 . A memory system according to  claim 15 , wherein:
 each individual unit comprises a page;   tracking whether individual units active or inactive includes tracking whether individual pages are active or inactive; and   placing inactive individual units in a self-refresh mode includes placing banks having only inactive pages in a self-refresh mode, such that such banks self-refresh their contents.   
     
     
         18 . A memory system according to  claim 15 , further comprising setting at least one variable indicating which individual units are to be placed in the self-refresh mode, and which individual units are to be placed in the command-based refresh mode. 
     
     
         19 . A memory system according to  claim 18 , wherein the at least one variable is stored in a table such that an entry of the table is associated with an individual unit and indicates whether such individual unit of the memory system is to be placed in self-refresh mode or command-based refresh mode. 
     
     
         20 . A memory system according to  claim 18 , wherein the at least one variable indicates a fraction of the individual units to be placed in self-refresh mode. 
     
     
         21 . A memory system according to  claim 20 , wherein the at least one variable is stored as a field in a mode register of the system.