描述
对Flash的读写操作都是基于页的,读写操作的时序分别如图5和图6所示。计算机通过CPCI总线发送出读或写命令后,FPGA内部根据接收到的命令执行相应操作。写Flash时,外部采集的数据输入RAM1,RAM1满后,开始向RAM2写入数据,同时选通第一条总线上第一组Flash的写模块,在写模块中通过计数器产生ALE、CLE、WE、RE等控制写Flash的相应时序,将数据从RAM中编程到Flash内存,并令页地址加1,依次循环(循环流程见图3)。当总线上的第4组Flash的页地址为64时,块地址加1,
并读取无效块信息,如果为无效块,则屏蔽此块,重新读取下一块信息,直至读取到正常块为止。如果是正常块,则向此块中写入数据,同时将页地址清零。读操作与写操作类似,只不过是将Flash中的数据读出先送到RAM,然后依循环次序读取RAM即可。
欧美品牌停产的,常用的“PLC”备品备件
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6,《化工厂药液恒流量计算机控制系统》
7,《电气控制系统》造纸,印染生产线,变电站综合自动化控制系列
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