Dynamic Partial Array Self-Refresh for DDR Memory

The patent divides the DDR memory into multiple banks or segments that can be independently controlled. This segmentation allows the system to selectively refresh only the memory portions that are currently in use, rather than refreshing the entire memory array. By tracking which memory segments are allocated and which are free, the system can reduce power consumption while maintaining the increased memory capacity needed for performance.

The patent implements a feedback mechanism where the memory controller continuously monitors memory allocation status and uses this information to control the refresh process. When memory is allocated to specific segments, the controller ensures those segments are refreshed even in low-power modes. This feedback loop maintains content retention reliability while still enabling power savings through partial self-refresh of only active memory regions.

The patent enables the memory system to self-manage its refresh requirements by automatically tracking allocation status and controlling refresh operations without requiring active CPU intervention. The memory controller autonomously determines which segments need refreshing based on allocation information, eliminating the need for CPU-intensive decision-making processes. This self-service approach maintains memory management flexibility while significantly reducing CPU resource consumption.