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Author Topic: lpc1768 maximum speed  (Read 1472 times)
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alberto110
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« on: January 02, 2013, 01:19:30 13:19 »

Hi ,
  i have question . the lpc1768 run at 100MHz but the flash can't run at this frequency .
 and there is flash accelerator inside the LPC , but with this peripheral , does the micro can
 run with maximum 100MHz speed ?, and if not why the NXP claims this .
thanks alot .
« Last Edit: January 03, 2013, 06:55:20 06:55 by alberto110 » Logged
dcsmrgun
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« Reply #1 on: January 03, 2013, 07:40:01 07:40 »

While I haven't had a chance to benchmark this, my understanding is that you can run full speed with zero wait states by using the flash memory accelerator as NXP states.
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bigtoy
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« Reply #2 on: January 04, 2013, 06:17:48 06:17 »

It's also my understanding that it will run at full speed using the accelerator. Those accelerators are quite common in the faster Cortex-M processors, and they're basically a combination of a look-ahead cache and a very wide-bus flash memory interface. So they read multiple instructions ahead of time and store them in RAM, ready for when the processor needs its next instruction.
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alberto110
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« Reply #3 on: January 04, 2013, 04:05:28 16:05 »

It's also my understanding that it will run at full speed using the accelerator. Those accelerators are quite common in the faster Cortex-M processors, and they're basically a combination of a look-ahead cache and a very wide-bus flash memory interface. So they read multiple instructions ahead of time and store them in RAM, ready for when the processor needs its next instruction.

but , do you mean that we should run the program from SRAM ? . my program entirely programed into flash !
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dcsmrgun
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« Reply #4 on: January 05, 2013, 12:08:05 00:08 »

but , do you mean that we should run the program from SRAM ? . my program entirely programed into flash !

I could be wrong but I think this is just a thing that the accelerator facilitates, so it won't matter. It will throw whatever it needs into RAM regardless.

Now you've piqued my interest and I think I know what my next project will be Smiley
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