Patent ID: 6400644
Filing Date: 2002-06-04
Classification: G11C

Abstract:
A semiconductor control unit comprising:multiple sample-and-hold circuits for storing externally input data therein, each said sample-and-hold circuit including a switch for selectively passing the data therethrough; a controller, connected to the sample-and-hold circuits through respective signal lines, for sequentially outputting switch control signals to the sample-and-hold circuits to get the data stored in one of the sample-and-hold circuits after another; and the same number of switching circuits as the sample-and-hold circuits, each said switching circuit being provided for associated one of the signal lines, wherein each said switching circuit receives not only a first one of the switch control signals from the controller through its associated signal line but also a state signal from another one of the switching circuits that received a second one of the switch control signals that precedes the first switch control signal, and is not allowed to output the first switch control signal to associated one of the sample-and-hold circuits while the switch of another one of the sample-and-hold circuits that received the second switch control signal is opened.