What does precharge mean in ddr?

In DDR (Double Data Rate) memory, "precharge" refers to the process of preparing a memory bank for a new read or write operation by resetting the state of the memory cells. During precharge, the selected row is deactivated, and the bitlines are brought to a known state, ensuring that no residual charge remains. This is crucial for maintaining data integrity and allows the memory controller to access a different row or bank efficiently. Precharge is typically a necessary step before activating a new row in the same bank or switching to a different bank.