AT&T 3B2 Off-Line Diagnostic Manual page 127

- - - - - - - - - - - - - - - - - - - - - Version 3 Hardware System Board Diagnostics
Test Numbers:
Function:
Procedure:
2 and 3
These tests ensure that the Segment Descriptor Caches (SDCs) can be written
to and read from.
A pattern test on each of the 32 segment descriptor locations is performed.
Test 2 - checks the lower half of the SDC area.
Test 3 - checks the upper half of the SDC area.
Hardware Tested: The SDCs are tested.
Data Returned: The failing test number, the failing test pattern, the actual test pattern read, and
the failing SDC address are returned.
Notes: None
Test Numbers:
Function:
Procedure:
4 and 5
These tests ensure that the Left-Hand Page Descriptor Cache (LHPDC) can be
written to and read from.
Four binary bit patterns are written and read back for comparison.
Test 4 - checks the lower half of the LHPDC area.
Test 5 - checks the upper half of the LHPDC area.
Hardware Tested: The LHPDC is tested.
Data Returned: The failing test number, the failing test pattern, the actual test pattern read, and
the failing LHPDC address are returned.
Notes: None
Test Numbers:
Function:
Procedure:
6 and 7
These tests ensure that the Right-Hand Page Descriptor Cache (RHPDC) can be
written to and read from.
Four binary bit patterns are written and read back for comparison.
Test 6 - checks the lower RHPDC area.
Test 7 - checks the upper RHPDC area.
Hardware Tested: The RHPDC is tested.
Data Returned: The failing test number, the failing test pattern, the actual test pattern read, and
the failing RHPDC address are returned.
Notes: None
SYSTEM BOARD DIAGNOSTICS 3-87