| 摘要 |
<p>PURPOSE:To form an electronic equipment without malfunction by de-energizing a chip select line signal in another connector group which energizes an attention card, when the attention IC card to be connected to a connector, which is designated by a designating device, is accessed. CONSTITUTION:In order to access an IC card 9, a correspondent address is outputted on an address bus 20. One of correspondent signals 22-24 is active- outputted by an address decoder 13. Now, when the card, to which the access is executed, is an extending RAM card, only the select signal 22 goes to be '0'. When a chip select control circuit 14 receives this signal, according to the contents of a register which is held in an internal part, only one of chip select line signals 26a or 26b is made active. Namely, even when a same extending connector is connected to connector 11 and 12, only one connector goes to an accessable condition.</p> |
