Patent ID: 8391090

Claim:
A controller comprising: a set of first terminals to be coupled to a device that is under control of the controller; and a control circuit configured to generate and output onto the set of first terminals: synchronous mode information comprising a selected one of selection and non-selection modes, the selection mode causing the device to return to the controller a first data signal while activating a first data strobe signal that is synchronous in phase with a system clock, the non-selection mode causing the device to return to the controller a second data signal while activating a second data strobe signal that is asynchronous in phase with the system clock signal, and edge specifying information comprising a selected one of first and second states, the first state causing the device to activate the first data strobe signal at a first timing, the second state causing the device to activate the second data strobe signal at a second timing that is different from the first timing.