Patent ID: 6745271
Filing Date: 2004-06-01
Classification: G06F

Abstract:
A data transfer system comprising:a plurality of memory modules; a controller for sending data to each of said memory modules, and receiving data from each of said memory modules; and a bi-directional data bus connected between said memory modules and said controller, wherein, each of said memory modules has a command decoder for receiving a signal from said controller, and is selected in response to an output of said command decoder, and each of said memory modules and said controller have respective data input/output circuits; and wherein when said bi-directional data bus is used, each of said data input/output circuits of said controller and a selected one of said memory modules outputs a constant amount I of current as information â€œ0â€ , which is to be supplied to said bi-directional data bus, and an amount of current which is (1+&agr;) times greater than the constant amount I, as information â€œ1â€ , in accordance with output data, and each of said data input/output circuit uses transmission data representing a value and a direction of current flowing through said bi-directional data bus.