Lpc2000

--- In lpc2000@yahoogroups.com, "shergtu" <shergtu@...> wrote:
>
> Hi,
> 
> Do I need to do anything special to use the 8K block of RAM on the 2148 
> located from 0x7FD0.0000-0x7FD0.1FFF?  (The one earmarked for USB DMA 
> transfers).
> 
> I won't be using the USB functionality & figured that gives me another 
> 8K of RAM.  However, writes to this 8K region seem to have no effect 
> (read back 0), at least through the debugger.
> 
> Perhaps there is some register that needs to be told "enable the USB 
> DMA RAM for general purpose use by the CPU"?
> 
> Thanks!
>

I have found so far, that by making changes to linker file, RAM  is
there available for RD/WR, but C-Spy will *not* show anything but
zeros; it treats it as ROM, any overtyped value is ignored.
I have downloaded JARM.DLL ver 3.14, replaced my 2.74c, with no
difference in behavior. 
Is anybody outhere able to see in C-Spy the USB_DMA RAM as RAM? 

I appreciate your feedback. 
BTW, EWARM 4.31A is out, have not tested it, yet. 
My observations were for ver. 4.30A.

Thanks!

Roger