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在 EPROM 写入与读出时,不时遇到这样的现象:EPROM 写入是正确的,但读出时却有差错,若仔细观察,又发现差错有一定规律,即写入内容仍是正确的,只不过读出时的顺序改变了。究其原因,原来问题出在地址线的连接上。因为,在只读存贮器的选择电路中,一般地,只读存贮器的地址线直接与 CPU 的低地址连接,而高地址则通过译码器进行控制。因此,要使 EPROM 的内容读写一致,读出
In the EPROM write and read, from time to time encounter such a phenomenon: EPROM write is correct, but there are errors when read, if carefully observed, and found that there is a certain law of error, that is still correct content to write , But the order of reading changed. The reason, the original problem lies in the address line connection. Because, in read only memory selection circuit, generally, the address line of the read only memory is directly connected to the low address of the CPU, and the high address is controlled by the decoder. Therefore, to make EPROM read and write the same content, read out