A memory control system has a replacement detection/notification circuit
for detecting occurrence of replacement of dirty entry in a cache and
informing a memory controller of the detection, and a state control
circuit for precharging the currently active page in a main memory when
the memory controller is informed of the detection and a preceding access
to the main memory attendant upon the replacement of dirty entry is
completed. By precharging the active page in the main memory to return to
the idle state when the preceding access attendant upon the replacement of
dirty entry is completed, the succeeding access can be done only by
activating the aimed page probably different from the above page. It is
thereby obviated to return the activated page due to the preceding access
to the idle state after a page miss occurs in the succeeding access.
