Semiconductor integrated circuit device with memory blocks and a write buffer capable of storing write data from an external interface

A semiconductor integrated circuit comprising:

• a semiconductor chip;
• a plurality of memory banks formed on said semiconductor chip, each comprising a data input section, each of said plurality of memory banks including a plurality of memory cells requiring periodical refreshing of stored data;
• a plurality of write buffer circuits formed on said semiconductor chip, each of said plurality of write buffer circuits being coupled to corresponding data Input sections of corresponding ones of said plurality of memory banks, respectively;
• an external input circuit formed on said semiconductor chip, said external input circuit being coupled to said plurality of write buffer circuits and being supplied with data to be written to the corresponding memory banks;
• and
• a control circuit formed on said semiconductor chip to control at least a selected one of the write buffer circuits so as to have the selected write buffer circuit selectively hold data supplied to said external input circuit during a refresh action and/or read operation of the corresponding memory bank,
• wherein said control circuit controls the selected corresponding write buffer to supply said data to be written to the corresponding memory bank after said refresh action and/or said read operation to the corresponding memory bank are completed.