Sun Microsystems SUN BLADE 150, Service Manual

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Appendix C Functional Description C-21
C.9.2 DIMMs
C.9.2.1 Speed and Timing
The Sun Blade 150 system uses PC100 compliant SDRAM DIMMs. The motherboard
can support up to 4 Gbytes with four DIMM slots. The CPU can address 4 Gbytes of
memory.
Note – Always remove and replace DIMMs in order, beginning with the DIMM
closest to the edge of the motherboard (
FIGURE C-2
). The system will not function
properly with only three installed DIMMS. You must install either one DIMM, two
DIMMs, or four DIMMs.
Note – The maximum main memory is 512 Mbyte per slot.
The DIMMs comply with the following parameters:
C.9.3 SDRAM DIMM Configuration
The table below shows the different SDRAM DIMMs that can be used in the Sun
Blade 150 system.
TABLE C-4
DIMMs Performance Range
Frequency tRC tRAS tRP tclk
133 Mhz (10ns) 67.5 ns 45 ns 20ns 7.5ns
TABLE C-5
SDRAM size options (DIMMs only)
DIMM
Mem Size
Configuration Technology
No. of chips
on DIMM 2-DIMM
Mem Size 4-DIMM
Mem Size
128 Mbyte 16Mx72 128 Mbit 9 256 Mbyte 512 Mbyte
256 Mbyte 2 * 16Mx72 128 Mbit 18 512 Mbyte 1 Gbyte
512 Mbyte 2 * 32Mx72 256 Mbit 18 1 Gbyte 2 Gbyte