IBM R30 Operator's Manual page 225

ECC Data Lines Accessibility Test
This test checks the accessiblity 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
Parameter 1 Sub test #
Parameter 2 Proc #
Parameter 3 ECC sel.
Parameter 4 1
Parameter 5 2
Parameter 6 3
Parameter 7 4
Parameter 8 SIMM/Bus mode
Notes:
1. The different values are:
2. If your answer is 0, you get the number of the default DIMM.
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.
st
Mem. Bnk Add.
nd
Mem. Bnk Add. Mem Address (Mb)
rd
Mem. Bnk Add. Mem Address (Mb)
th
Mem. Bnk Add. Mem Address (Mb)
. 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.
If your answer is 1, you get the bus value which enables you to determine the
failing bits.
Definition Possible Values Default Value
Subtest Number 0 to 2
Processor Number 0 to 7
ECC Selection 0 to 5
See note 1
Mem Address (Mb)
See note 2 0=SIMM number
1=Value of Bus
SystemGuard Test Groups
0 = All tests
linked
0
2
0
0xffffffff
0xffffffff
0xffffffff
0
A-17