• State Not Answered
  • Locked Locked
  • Replies 0 replies
  • Subscribers 350 subscribers
  • Views 1194 views
  • Users 0 members are here
2025 survey

We are running a survey to help us improve the experience for all of our members. If you see the survey appear, please take the time to tell us about your experience if you can.

Options
Related
How was your experience today?
This discussion has been locked.
You can no longer post new replies to this discussion. If you have a question you can start a new discussion

LPC2103 vs. LPC2104 - MAM Bug?

thrust26

Hi,

I am experiencing a weird problem when running the same code on the two chips running at the same speed. 

  • with MAM mode = 0, both cycle counts are identical (13680 cycles)
  • with MAM mode = 2, the LPC2103 is slightly slower than the LPC2104 (4892 vs. 4820 cycles), this is expected behavior because the latter uses two (instead of just one) Flash banks and has two buffers for prefetch and branches 
  • with MAM mode = 1, the LPC2103 is massively faster than the LPC2104 (5793 vs. 9472 cycles). I would have expected that instead the LPC2104 is slightly faster, just like in mode 2.

The description of MAM mode 1 is identical for both. They both buffer only sequential code access. 

So it looks like either the LPC2103 or the LPC2104 have a bug in MAM mode 1. Or that for one of these, MAM mode 1 works differently.

Is that a known problem? Does there maybe an updated documentation exist or an errata sheet which explain what I am experiencing?