IBM 7013 J Series, Operator'S Manual

Page: 243 / 297

SystemGuard Test Groups
A-15
Basic Main Memory Test
This test is performed by all the processors and it checks the capability to access the main
memory in all kinds of data formats. This test applies to one main memory location and the
words used during the test are not restored.
This test partially checks the DCB ASICs. It consists of the 10 sub-tests that follow. If an
error is detected in any of these tests, a suitable error message is displayed on the console.
Byte Write Checking A byte is written and verified. If there is mismatch between the read
value and the written value, an error message is generated.
Aligned Half Word Write Checking
This test writes a half word and checks for the possible errors in the
read value.
Unaligned Half Word Write Checking
This test writes a half word and checks the corrected value against
the read value.
Aligned Word Write Checking
It writes a full word and checks it against the read value. An error
message is generated if a mismatch is detected between the read
value and the written value.
Unaligned Word Write Checking
This test writes an unaligned word and verifies it against the
corrected value.
Aligned Double Word Write Checking
This test checks the access by writing an aligned double word and
does a read verification. If the verification fails, a console error
message appears.
Unaligned Double Word Write Checking
This test writes an unaligned double word and verifies it against the
corrected value.
Multiple Individual Store Checking
Access to the 1MB address is checked through writing. A
comparison is made between written value and the read value.
Addressing tests in Work Mode Checking
Access to the 1MB address is checked through writing. A
comparison is made between written value and the read value.
Aligned Multiple Store Checking
In this test multiple words are written and read back. If the
verification fails, an Aligned Multiple store error is displayed.
Unaligned Multiple Store Checking
This test writes multiple words and checks for misalignment
interrupt. An error message is displayed if it is not set.