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阅读：1107回复：2
关于DSP存取外部存储器的问题，用的是5409A。
用C语言存取外部RAM应该进行那些操作？比如首先设置哪些寄存器，然后选通
外部地址之类的，直接用物理地址行不行，5409A是不是只能把外部的RAM当PM取，、 不能当DM取？ |
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沙发#
发布于：2003-05-11 12:23
depends on your HW.
You have to figure out its overlay and just use it as regular memory. Pay attention to wait state, you might need more than one wait states. |
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板凳#
发布于：2003-05-11 12:26
Except the wait states, external memory is no different to internal. Depends on memory allocation and your memory map, you can put both DM and PM on external. Then you can load program or ref. data on external mem just as you do to regular internal memory as regular C
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