Semiconductor memory device and refreshing method of semiconductor memory device

A method of refreshing a semiconductor memory device having a plurality of banks, comprising the steps of:

• generating a plurality of refresh address signals associated with the plurality of banks;
• supplying the plurality of refresh address signals in a time-divisional manner;
• holding a refresh address signal to be provided to an associated one of the banks;
• and
• refreshing the associated one of the banks in accordance with the held refresh address signal.

A method of refreshing a semiconductor memory device having a plurality of banks, comprising the steps of:

• generating a bank address signal which designates a bank to be refreshed, by using a refresh request signal;
• selecting one of the plurality of banks in accordance with the bank address signal;
• generating a refresh address signal corresponding to the selected bank;
• supplying the refresh address signal onto a single signal line;
• holding the refresh address signal;
• and
• refreshing the selected bank in accordance with the held refresh address signal.