Interpreting Basic Pattern Test Results; If Problems Were Found By The Basic Pattern Test - Agilent Technologies E5900B User Manual

Testing Target System Memory
Memory Test Patterns

Interpreting Basic Pattern test results

Consistent errors such as a particular bit incorrect every four bytes typically
indicate a problem with the data lines. Random or sparse errors may indicate
hardware data memory errors—check individual locations with the Walking
Ones and Walking Zeros tests.
This test will halt and generate an error message if your Memory Range
specification causes this test to be performed outside the range of valid
memory in your target system.
This test will not halt but it will generate an error message if it is run on ROM
or on locations with data line or location errors.
You can open a memory window on your logic analyzer to view the memory
content. Expect to see the pattern and the complement of the pattern that
was specified.
This test will not always detect errors in the address lines. For example, if a bit in
the address lines is stuck high or low, the Pattern Test will write to a different
location in memory. Then the read from memory for comparison will also be
made from that different location so the data will be correct. Use the Address
Pattern test with this test to completely evaluate the memory range.

If problems were found by the Basic Pattern test

Below are two examples of problems found by the Basic Pattern test.
Example 1: Consistent error
Starting: Basic Pattern Test
Error: 1 at address 00000200:
Read 5557
Expected 5555
Error: 2 at address 00000204:
Read 5557
Expected 5555
Error: 3 at address 00000208:
Read 5557
Expected 5555
Error: ...
Read ...
Expected ...
92
(0101 0101 0101 0111)
(0101 0101 0101 0101)
(0101 0101 0101 0111)
(0101 0101 0101 0101)
(0101 0101 0101 0111)
(0101 0101 0101 0101)
Emulation for the Motorola M•CORE