Semiconductor device, refresh control method thereof and computer system

摘要

A semiconductor device comprises a first memory cell array, a register storing information of whether or not one of the word lines in an active state exists in a unit area and storing address information, and a control circuit controlling a refresh operation for a refresh word line based on the information in the register when receiving a refresh request. When the one of the word lines in an active state does not exist, memory cells connected to the refresh word line are refreshed. When the one of the word lines in an active state exists, the one of the word lines in an active state is set into an inactive state temporarily and the memory cells connected to the refresh word line are refreshed after precharging bit lines of the memory cells.

主权项

1. A semiconductor device comprising:
a memory cell array configured to comprise a plurality of memory cells each respectively arranged at an intersection of one of a plurality of word lines and one of a plurality of bit lines; a register circuit configured to store state information related to at least one of the plurality of word lines; an first comparison circuit configured to determine if a relief originating address matches a refresh address; a first selector configured to select a first address between an array address and a relief destination array address in response to the determination of the first comparison circuit; a second comparison circuit configured to determine if the first address, selected by the first selector, is related to the at least one of the plurality of word lines; a second selector configured to select a second address between the relief destination address and the array address in response to the determination of the second comparison circuit; and a control circuit configured to perform a refresh operation on a memory cell, wherein the refresh operation determines an address of the memory cell by at least the second address.