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Accessing USB DMA RAM on LPC2148

Arjun Murthy

Hi,

I am trying to do memory test on all RAM memory spaces on LPC2148. Till the end of static RAM 0x40007FFF there is no problem. But when I try to access and write (Base Address=7FD00000H)USB DMA RAM getting error on console and it enters infinite loop.
Data Abort: ARM Instruction at 00000070H, Memory Access at 7FD00000H

But in manual it says "While the USB DMA is the primary user of the additional 8 kB RAM, this RAM is also accessible at any time by the CPU as a general purpose RAM for data and code storage."

Thanks for answers.

Arjun

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