公开(公告)号：US06396767B1

公开(公告)日：2002-05-28

申请号：US09725190

申请日：2000-11-29

申请人： Denny Tzeng ,  Lan Chih-Hung ,  Lee Ching-Kuo

发明人： Denny Tzeng ,  Lan Chih-Hung ,  Lee Ching-Kuo

IPC分类号： G11C800

CPC分类号： G11C5/06 ,  G11C5/04 ,  G11C8/12 ,  G11C17/00

摘要： A device for accessing a ROM unit with groups of module information of memory modules saved therein. This invention saves plural groups of memory module information in a ROM unit, and applies a selecting circuit to indicate a memory module information to be loaded out. In an embodiment, the selecting circuit has a voltage divider circuit driven by the WP Pin of an IC, and a comparer or a converter to connect with the voltage divider circuit so as to produce a selecting signal, and then uses a decoder to transfer the selecting signal into a address number which will be used to read the selected memory module information from the ROM unit. In another embodiment, the selecting circuit has a plurality of fuses which are connected with plural output-pins of an IC, and multiplexers to optionally disconnect some fuses of the fuse circuit so as to generate kinds of different selecting signals. The selecting signals will then be decoded to locate the required memory module information from the ROM unit.

摘要翻译： 一种用于访问ROM单元的装置，其中存储有存储模块的模块信息的组。 本发明将多组存储器模块信息存储在ROM单元中，并且施加选择电路以指示要加载的存储器模块信息。 在一个实施例中，选择电路具有由IC的WP引脚驱动的分压器电路，以及与分压器电路连接以产生选择信号的比较器或转换器，然后使用解码器将 将选择信号选择为将用于从ROM单元读取所选存储器模块信息的地址号。 在另一个实施例中，选择电路具有多个与IC的多个输出引脚连接的保险丝，以及多路复用器，可选择地断开熔丝电路的一些保险丝，以产生各种不同的选择信号。 然后将选择信号解码以从ROM单元定位所需的存储器模块信息。