| 摘要 |
<P>PROBLEM TO BE SOLVED: To enable impedance control of a data terminal even in a period of entry in a self-refresh mode. <P>SOLUTION: A controller 50 according to one embodiment allows a semiconductor device 10 to enter a self-refresh mode by issuing a self-refresh command SRE to the semiconductor device 10. The semiconductor device 10 always activates an input buffer circuit 72 for receiving an impedance control signal ODT even in the self-refresh mode, and allows bypass of a latch circuit 84 that synchronizes itself with an internal clock signal ICLK0 and latches the impedance control signal IODT0, in the self-refresh mode. This enables input of the impedance control signal ODT in the self-refresh mode without using an external clock signal CK. <P>COPYRIGHT: (C)2013,JPO&INPIT |
