IBM 7013 J Series, Operator'S Manual

Page: 245 / 297

SystemGuard Test Groups
A-17
ECC Data Lines Accessibility Test
This test checks the accessibility for all the data lines to the ECC memory banks, through
SMC ASICs. The following h/w parts are checked by running this test.
•
DCB ASICs
•
SMC ASICs
•
Connection of data lines between CPU daughter boards and MPB ASICs
•
Connection of data lines between MPB ASICs and ECC memory chips.
Words manipulated / used are not restored at the end of the test. This test is applied to all
present memory banks.
Entry Parameters
Parameters Name Definition Possible Values Default Value
Parameter 1 Sub test # Subtest Number 0 to 2 0 = All tests
linked
Parameter 2 Proc # Processor Number 0 to 7 0
Parameter 3 ECC sel. ECC Selection 0 to 5
See note 1 2
Parameter 4 1
st
Mem. Bnk Add. Mem Address (Mb) 0
Parameter 5 2
nd
Mem. Bnk Add. Mem Address (Mb) 0xffffffff
Parameter 6 3
rd
Mem. Bnk Add. Mem Address (Mb) 0xffffffff
Parameter 7 4
th
Mem. Bnk Add. Mem Address (Mb) 0xffffffff
Parameter 8 SIMM/Bus mode See note 2 0=SIMM number
1=Value of Bus 0
Notes:
1. The different values are:
. 0 –> ECC invalidation,
. 1 –> ECC validation and checkstop detection,
. 2 –> ECC test,
. 3 –> ECC validation and no checkstop detection,
. 4 –> ECC generation checking,
. 5 –> ECC correction checking.
2. If your answer is 0, you get the number of the default DIMM.
If your answer is 1, you get the bus value which enables you to determine the
failing bits.
Work Area Checking
This program calculates the memory address available on each board to perform the sub
tests. If no working area exists, a fatal error message is displayed on the console.
Walking 1 Data Test
This test basically identifies if any ECC data lines are stuck at level 0 or to any other ECC
data line. This test writes a pattern of a single1 bit among 0 bits on the cache line. Then it is
read and compared.
Walking 0 Data Test
This test isolates an open line among the ECC data lines. It writes a pattern of a single 0 bit
among 1 bits on the cache line. Then it is read and compared.