The advantage is that you might not need any external RAM at all if you can get away with a very small amount on chip.
其好处是,如果您可以在芯片上拥有少量内存,就可能不再需要任何外部RAM。
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So even though we're not literally throwing RAMaway, we're not physically moving anything, conceptually, we have to go through memory in this order back to back to back and then undo it.