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MEM

I have a little question.

In the comments of video_copy.cfg, I saw the sentences below:

First we turn off the switch that allows the DSKT2 algorithm memory manager to give to an algorithm external memory for scratch if the system has run out of internal memory.

So, I want to know the exactly meaning of internal memory and external memory.

For example, the DDR2 is the internal or the external memory?? And how about the others??