Lpc2000

At 12:36 PM 4/10/05 -0400, Gennady Palitsky wrote:

>Maybe someone can help me to clarify the question with GPIO timing.
>
>My intention is to move some data from flash to port0 on LPC2138 as fast as
>possible.

There have been multiple threads on this starting with "Simple test program 
- is now instruction pipeline/VPB question" back in Nov of 2003.  An 
explanation from Philips appeared in the thread "I/O Speed - An 
Explanation" about a year later. Look up the actual message for the full 
explanation but quoting from it

"The I/O speed has a maximum at ~3.7 Mhz because of several reasons,  .......

It is caused by interactions between the
ARM pipeline, the VPB bus, the ARM AHB wrapper (interface between the
ARM7TDMI-S core and the AHB bus), and the instruction timing itself. "

Robert

" 'Freedom' has no meaning of itself.  There are always restrictions,   be 
they legal, genetic, or physical.  If you don't believe me, try to chew a 
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