Simm Errors - Sun Microsystems SPARCstation 20 Service Manual

SIMM Errors

If the operating system, diagnostic program, or POST does not display a SIMM
location ("J" number) as part of the memory error message and the only available
information is a physical memory address, use
TABLE 4-4
VSIMM or NVSIMM
Slot Location
VSIMM0, J0407
VSIMM1 or NVSIMM, J0406
FIGURE 4-3
Note – The banks listed in
DSIMM slots on the system board. The physical order of the slots is based upon an
alternating bank pattern: bank 0, bank 2, bank 5, bank 3, bank 6, bank 1, bank 7, and
bank 4.
Each bank allows enough address space to accommodate a 64-Mbyte DSIMM. If a
16-Mbyte or 32-Mbyte DSIMM is installed in a bank, the unused addresses are
"mapped out" by the memory management hardware. The physical memory
starting address of any capacity DSIMM installed will always be as listed in
TABLE 4-4
SIMM Slots and Physical Address
DSIMM Slot
Location
J0201 (bank 0)
J0202 (bank 2)
J0203 (bank 5)
J0301 (bank 3)
J0302 (bank 6)
J0303 (bank 1)
J0304 (bank 7)
J0305 (bank 4)
shows the SIMM locations in the system.
TABLE 4-4
. lists SIMM slot layout and installation sequence.
TABLE 4-4
to locate the failing SIMM.
TABLE 4-4
Physical Memory
Address Start
0000 0000(16)
0800 0000(16)
1400 0000(16)
0c00 0000(16)
1800 0000(16)
0400 0000(16)
1c00 0000(16)
1000 0000(16)
do not correspond to the physical order of the
Chapter 4 Troubleshooting Procedures
Physical Memory
Address End
03ff ffff(16)
0bff ffff(16)
17ff ffff(16)
0fff ffff(16)
1bff ffff(16)
07ff ffff(16)
1fff ffff(16)
13ff ffff(16)
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