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项目背景 目前市场上出售的存储芯片功能各异、品种繁多,但是归结起来不外乎以下几种:一种是只读式存储器,只能读取事先写入的数据而工作中不允许修改,如ROM;另一种是可读可写的存储器,既可以从其本身读取数据,又可以根据需要对其存储单元进行修改,典型的有SRAM和FLASH等;还有一种比较新的存储器是双口RAM,这种存储器是具有两套地址和数据总线的RAM,这样该RAM就可以被两个控制系统共享,当一方写入数据的时候,该RAM可以产生中断通知另一方,如此一来该RAM就可以作为两个控制系统的数据交换区间。
Project Background Currently on the market for sale of memory chips vary in function, variety, but summed up nothing more than the following: one is read-only memory, can only read the data written in advance and work is not allowed to modify, Such as ROM; the other is readable and writable memory, both from its own to read data, but also can be modified as needed memory unit, there are SRAM and FLASH, etc .; there is a relatively new memory is Dual-port RAM, which is a RAM with two sets of address and data buses so that the RAM can be shared by both control systems. When one side writes data, the RAM can generate an interrupt to inform the other The RAM can be used as the data exchange interval between two control systems.