Messages

1

NXP^TM LPC2XXX and LPC17XX / Re: NXP news - new ARM9 baseddevices

« on: April 04, 2008, 07:40:18 PM »

LPC2478 was recently nominated as the EDN Innovation Product of Year finalist in 2007.

In my book it should be nominated "Most over-hyped, delayed, bug-ridden device of 2006, 2007, and 2008".

-- Paul.

2

NXP^TM LPC2XXX and LPC17XX / Re: Ethernet boot-loader for the LPC23XX

« on: April 04, 2008, 07:38:33 PM »

Hi Bob

Welcome to the forum and thanks for your ideas.
I did do as you suggested, but only after checking the clocking details because my main concern was with 'frying' the chip by using false clock settings when programming. It turned out (as I now believe to be the true case) that the internal 4MHz RC oscillator was being used rather than the external 12MHz crystal, which would have meant some overprogramming - however with the correct settings it didn't make any noticable difference in the speed.

I believe that the processor speed is not required on the new LPC2k chips, only the old 210x chips absolutely required the CCLK to be known to calibrate delay loops.  I now believe status bits are polled in the IAP routines and, hence, speed is mostly irrelevant.

The LPC21xx series can reprogram 512K in about 2s with the PLL enabled.  The LPC23xx series is about 1/2 that speed (I have no idea why).

Do you use a moderately fast CRC16?  I wonder because our CRC32 verifies flash at about 700Kbytes/second at 60MHz...

-- Paul.