I have a project running on a LPC2478 with a QVGA LCD, similar to the Olimex LPC2478-STK (a subset ). It runs at 72MHz.
The size of my code is approaching the 500k limit, so I have tried to cross load the code from a serial flash to external SD-RAM and execute the code from the external SD-RAM. In this way my code can exceed the 500k limit.
Unfortunately, the execution speed is slower when running from the SD-RAM. It runs app. tree times slower. The speed reduction comes probably because the LCD uses the SD-RAM, and therefore occupies the bus, resulting in reduced access speed for normal read/write operations.
Does anybody know if the LPC1788 have similar speed reduction on executing code from the external bus? Or has NXP solved this infirmity in the LPC1788?
Thanks in advance!