| 摘要 |
<p>A circuit is provide which allows two wire communication between a key (Fig. 1) containing a memory device (18) and a key reader (Fig. 3). The power necessary to drive the circuit contained in the key (Fig. 1), as well as all command signals, address locations and data input/output are multiplexed over one wire (12) with the other wire (14) being used as a ground wire (Gnd). By multiplexing the power, commands and data in this fashion, the interconnect mechanism between the key portion of the circuit (Fig.1) and the key reader portion of the circuit (Fig. 3) has been greatly simplified.</p> |
