TMS320F28034: Question about MARCH Test

Green Deng said:

how does STL_MARCH_TEST_testRam perform MARCH Test on RAM? Is it tested 4 by 4 bytes?

The memory is walked through in increments of 32-bit words. In terms of pseudocode, it looks something like this--

1. fill memory with ~pattern

ascending_test:
2. read 32-bit word
3. compare to ~pattern, exit if not equal
4. write pattern to 32-bit word
5. read 32-bit word
6. compare to pattern, exit if not equal
7. increment 32-bit word's address

8. repeat 2-7 for all 32-bit words

9. repeat 2-8 again once more but instead step 2-3 will use pattern and steps 4-6 will use ~pattern

(note that this point, we're pointing to the last address of the memory range and the memory contains ~pattern)

descending_test:
10. read 32-bit word
11. compare to ~pattern, exit if not equal
12. write pattern to 32-bit word
13. read 32-bit word
14. compare to pattern, exit if not equal
15. decrement 32-bit word's address

16. repeat 10-15 for all 32-bit words

17. repeat 10-16 again once more but instead step 10-11 will use pattern and steps 12-14 will use ~pattern

Green Deng said:

is there a routine for cross-checking the clock using two independent clock sources?

This is what STL_OSCILLATOR_TEST is intended for. Since CPU Timer 2 can be configured to run from different sources than the SYSCLK, it can be used to check the clock.

Whitney