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How to use USBRAM for general purpose?

Hi,

According to LPC17xx user manual the LPC1768 has a total of 64kB of
SRAM. I understand that there is a 32kB bank of SRAM connected to the
CPU's instruction and data busses, which is readily accessible.

There are two more 16kB banks of SRAM which are stated as typically
being used for peripheral data but can supposedly still be used for
general purpose instruction and data storage.

In my project I have to use 40kb to 45kb SRAM. Could you please anybody
tell me how to use USBRAM? If any body can help on this, that will be
very appreciated.

-Prakash
9886545216