Patent ID: 8441832

Claim:
A semiconductor device comprising: a plurality of data input/output terminals each of which is used to output read data to outside and input write data from outside; a plurality of data output circuits each of which outputs the read data to an associated one of the data input/output terminals; a plurality of data input circuits each of which takes in the write data supplied from an associated one of the data input/output terminals synchronously with a strobe signal; a strobe terminal to which the strobe signal is supplied from outside; a signal input terminal to which a signal is supplied from outside, the signal input terminal being different from the data input/output terminals, the strobe terminal, and a terminal that controls the data input/output terminals; and a control circuit having a first operation mode and a second operation mode, wherein in the first operation mode, the control circuit activates all the data output circuits to output the read data in parallel to the data input/output terminals or the control circuit activates all the data input circuits to take in the write data supplied in parallel from the data input/output terminals synchronously with the strobe signal, and in the second operation mode, the control circuit selectively activates one of the data output circuits based on the signal supplied to the signal input terminal to output the read data to an associated one of the data input/output terminals and inactivates the other of the data output circuits, or the control circuit activates all the data input circuits to take in the write data supplied in parallel from the data input/output terminals synchronously with the signal supplied to the signal input terminal instead of the strobe signal.