SHDW-CIR (Common Shadow Circuit)
Issue 4 May 2002
10-1487555-233-123
Common Shadow Circuit Address Decoder Test
(#284)
This test verifies the operation of the shadow address decoder portion of the
common shadow circuit. Software writes data into memory locations that should
not be shadowed. The maintenance register of the common shadow circuit is
examined to determine if the shadow address decoder permitted the write to be
shadowed. The test fails if the writes were shadowed. This test is run only when
demanded by maintenance software and can be run on both Duplication Interface
circuit pack A and Duplication Interface circuit pack B. The same addresses used
in the Common Shadow Circuit Loop Back Test (#283) are used.
FAIL The Common Shadow Circuit portion of the Duplication
Interface circuit pack is defective and the Duplication
Interface circuit pack must be replaced.
1. Follow the “Repair Procedures for High and Critical
Reliability” section in Chapter 6, ‘‘Reliability Systems: A
Maintenance Aid’’ and replace the Duplication Interface
circuit pack.
2. Rerun the test.
NO
BOARD
The Duplication Interface circuit pack has failed to
handshake with either the active Maintenance/Tape
Processor (in the case of Duplication Interface circuit pack A)
or from Duplication Interface circuit pack A (in the case of
Duplication Interface circuit pack B).
1. Refer to NO BOARD description for the Duplication
Interface Circuit Pack Status Query Test (#315) in
DUPINT.
PASS Part of the Common Shadow Circuit is operating properly;
however, Tests #284 and #285 must pass before the
Common Shadow Circuit on this Duplication Interface circuit
pack is considered sane.
Table 10-567. TEST #283 Common Shadow Circuit Loop Back Test — Continued
Error Code
Tes t
Result Description/Recommendation
Continued on next page
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