Dimms; Speed And Timing; Sdram Dimm Configuration - Sun Microsystems Sun Blade 150 Service Manual

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 (
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:
TABLE C-4
Frequency
133 Mhz (10ns)
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-5
DIMM
Mem Size
128 Mbyte
256 Mbyte
512 Mbyte
DIMMs Performance Range
tRC tRAS
67.5 ns 45 ns
SDRAM size options (DIMMs only)
Configuration Technology
16Mx72 128 Mbit
2 * 16Mx72 128 Mbit
2 * 32Mx72 256 Mbit
). The system will not function
FIGURE C-2
tRP tclk
20ns 7.5ns
No. of chips 2-DIMM
on DIMM Mem Size
9 256 Mbyte
18 512 Mbyte
18 1 Gbyte
Appendix C Functional Description
4-DIMM
Mem Size
512 Mbyte
1 Gbyte
2 Gbyte
C-21