Semiconductor memory module

A semiconductor memory module having a plurality of units mounted on a module substrate, wherein

• each of the units has:
• a self-refresh determination circuit provided within a semiconductor chip for determining whether or not self-refreshing is carried out and for outputting a first signal in the case that it is determined that self-refreshing is carried out;
• a signal input part to which a second signal, different from said first signal, can be inputted;
• and
• a self-refreshing signal output circuit provided within said semiconductor chip for outputting a self-refresh signal for indicating the semiconductor chip is to be self-refreshed in, at least, either case where said first signal is inputted or where said second signal is inputted.

A semiconductor memory module having a plurality of units mounted on a module substrate, wherein

• each of the units has:
• a fuse for self-refresh control that can select, according to the mode of being blown or the mode of staying unblown, whether or not said semiconductor chip is to be self-refreshed;
• a self-refresh determination circuit provided within the semiconductor chip for determining whether or not self-refresh is to be carried out and for outputting a predetermined signal in the case that it has been determined for self-refresh to be carried out;
• and a self-refresh indication circuit provided within said semiconductor chip for outputting a signal indicating that said semiconductor chip is to be self-refreshed in, at least, either case where said self-refresh determination circuit outputs said predetermined signal or where said fuse for self-refresh control is in the mode of carrying out self-refresh of said semiconductor chip.