c5515EMIF外扩存储时，FLASH和SDRAM地址线接线方式为什么不一样？

各位，看了EVMC5515的原理图，外扩FLASH时地址线往后错一位比如A0接A1，而扩SDRAM时，却并没有错开，A0接A0，这是为什么呢？求教。

Shine：

这是EMIF口接异步memory的要求。

Of special note is the connection between the EMIF and the external device's address bus. The EMIFaddress pins EM_A[20:0] always provide the least significant bits of a double-word (32-bit) address. TheEM_BA[1:0] pins provide word (16-bit) and byte selection functionality according to the data bus widthconfigured in the Asynchronous CSn Configuration Register 1 (ACSnCR1).

http://www.ti.com/lit/ug/sprugu6b/sprugu6b.pdf

panfei du：

回复 Shine:

好的，谢谢