Lpc2000

Hi. Are Flash write errors normal, i.e. a known issue? When 
programming my LPC2138 using the isp21lpc utility, every now and then 
I get a write error; a second attempt always succeed. This happens 
roughly once every 100 programming attempts. I thought it could have 
been a problem with my serial cable or some other hardware problem, 
but now I added an IAP function to my test program and I am getting 
errors too (i.e., saved data differs from the source data, although 
the IAP copy ram to flash command returns CMD_SUCCESS). I checked 
everything and I think I covered the normal requisites:

* Prepare the Flash sector for writing (for erase).
* Erase the intended block.
* Prepare the Flash sector for writing.
* Write a 256 bytes block.

At each IAP call I:

* Disable all interrupts.
* Provide the right clock in KHz to the IAP (10 MHz-->10000).

I am using an external 10 MHz crystal, and no PLL.

Even the power supply seems solid; for what I've seen with my 
osciloscope, VDD never gets below 3.3V (it is normally at 3.334V).

Oddly enough, I am NOT getting any dabt exceptions; I would have 
expected that reading from a corrupted sector of the flash memory 
would have raised a dabt exception, which doesn't seem to be the 
case. Also, reads from the flash are consistent; i.e., even when I 
get the wrong data in the flash sector, the 'wrong' data is stable 
until erased. Also, the 'wrong' data is *similar* to the 'right' 
data; i.e., if I want to save "HELLO", I might get "HELLO" (correct) 
or perhaps "H??L?" (incorrect).

Any ideas?

Guille