AT&T 3B2 Off-Line Diagnostic Manual page 231

- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - Phase Descriptions
Phase #15 - MPB Memory Alignment Fault Detection
Diagnostics
Phase Name:
Type:
Function:
Tests:
Time:
Warnings:
Notes:
Phase #15 Tests
Fault/ Alignment (bflLtst)
Normal
This phase tests the MPBs detection and correct handling of memory and
alignment faults.
Test 1 - confirms that the MPB responds correctly to a memory fault.
Test 2 - confirms that the MPB responds correctly to an unequipped memory
fault.
Test 3 - confirms that the MPB responds correctly to an alignment fault.
1 second
None
None
Test Number: 1
Function: This test confirms that the MPB responds correctly to a faulted memory
location.
Procedure: Using a specific memory location, have the main board processor load a
specific memory location with known bad parity. Then let the MPB read that
location. This should cause the MPB to fault and set BPERROR in the Central
Status Request (CSR).
Hardware Tested: The MPB CPU and CSR are tested.
Data Returned: The failing test number (last number displayed on the system console prior to
failure) is returned.
Notes: None
Test Number: 2
Function: This test confirms that the MPB responds correctly when it reads an
unequipped memory location.
Procedure: Going to a specific address which is known not to be equipped, reads that
location and confirms that the MPB is faulted and an exception occurs.
Hardware Tested: The MPB CPU is tested.
Data Returned: The failing test number (last number displayed on the system console prior to
failure) is returned.
Notes: None
MULTIPROCESSOR DIAGNOSTICS 4-49