Patent ID: 7882279

Claim:
A bidirectional bus control circuit to which first and second direction signals instructing bus directions are input and which inputs and outputs a clock signal and data signal, the bidirectional bus control circuit comprising: a first bidirectional buffer that switches an input or output direction of the clock signal in accordance with a signal direction instructed by the second direction signal; a second bidirectional buffer that switches an input or output direction of the data signal in accordance with a signal direction instructed by the second direction signal; and a data confirmation unit that confirms a data signal input to the second bidirectional buffer and invalidates the confirmation of the data signal in accordance with switching of the signal direction instructed by the first direction signal from the input direction to the output direction, the switching of the signal direction instructed by the first direction signal from the input direction to the output direction occurring before the switching of the signal direction instructed by the second direction signal from the input direction to the output direction.