Sun Microsystems Ultra 1 140, Service Manual

Page: 52 / 176

4-6 Sun Ultra 1 Series Service Manual—November 1995
4
4.3 DSIMM Failures
At times, the operating system, diagnostic program, or POST may not display
a DSIMM location (U number) as part of the memory error message. If you
encounter this situation, and the only available information is a physical
memory address and failing byte (or bit), use the following table to locate the
defective DSIMM.
In Table 4-3, each bank allows enough address space to accommodate two
16MB, two 32MB, two 64MB, or two 128MB DSIMMs. Unused addresses are
mapped out by the memory management hardware. So, regardless of the
capacity of the DSIMM installed, the physical memory starting address will
always be as shown in the table.
Table 4-3 DSIMM Physical Memory Address
DSIMM Slot Location
Physical Memory
Address Start Physical Memory
Address End
Bank 0 0000 0000 0fff ffff
U0701 (byte 00-15, bits 000-127)
U0601 (byte 16-31, bits 128-255)
Bank 1 1000 000 1fff ffff
U0702 (byte 00-15, bits 000-127)
U0602 (byte 16-31, bits 128-255)
Bank 2 2000 000 2fff ffff
U0703 (byte 00-15, bits 000-127)
U0603 (byte 16-31, bits 128-255)
Bank 3 3000 000 3fff ffff
U0704 (byte 00-15, bits 000-127)
U0604 (byte 16-31, bits 128-255)