NXP Flash access time

Sweety Water Guest #3849918
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I plan a project with the LPC1788. It has internal flash (512k) and SRAM 
(64k).
Does anybody knows the access time for flash and for SRAM access? Is 
code executed in flash (XIP) as fast as code that is executed in SRAM?

The code size might exceed the internal RAM size. If XIP is slower than 
run in RAM and the code does not fit in internal SRAM I would have to 
consider external RAM additionaly.

What is your experience?
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