4/Tests and Troubleshooting
1503-0151-000 5/26/0 4-5
Test External RAM
The software tests all of the external RAM memory with a walking bit pattern test.
It writes a certain bit pattern to a block of memory and then reads that block of
memory. If the bit pattern that it wrote is not the same bit pattern that it reads back
the test fails.
Upon FAIL, replace the microcontroller board - See section 6
Test Display RAM
The software tests all of the display RAM memory via a walking bit pattern test. It
writes a certain bit pattern to a block of memory and then reads that block of mem-
ory. If the bit pattern that was written is not the same bit pattern that it reads back
the test fails.
Upon FAIL, replace the microcontroller board.
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