| 摘要 |
<P>PROBLEM TO BE SOLVED: To reduce power consumption during write operation. <P>SOLUTION: A semiconductor device comprises: a divider circuit 100 that generates a plurality of frequency-dividing clock signals CLK0 to CLKn each having a different phase by frequency-dividing an external clock signal CK; a multiplication circuit 200 that generates an internal clock signal CLKDQ by multiplying the frequency-dividing clock signals CLK0 to CLKn; and a data input/output circuit 300. In read operation, the data input/output circuit 300 serially outputs a plurality of read data items, which are supplied in parallel, in synchronization with the internal clock signal CLKDQ; and in write operation, it outputs in parallel a plurality of write data items, which are serially supplied, in synchronization with the frequency dividing clock signal CLK0. Thus, it is not necessary to transmit all of the plurality of frequency-dividing clock signals CLK0 to CLKn each having a different phase during write operation, and consequently, power consumption during write operation is reduced. <P>COPYRIGHT: (C)2013,JPO&INPIT |
