Dimms; Speed And Timing; Sdram Dimm Configuration - Sun Microsystems Sun Blade 100 Service Manual

C.6.2

DIMMs

C.6.2.1

Speed and Timing

The Sun Blade 100 uses PC100 compliant SDRAM DIMMs. The motherboard can
support up to 2 Gbytes with four DIMM slots. The CPU can address 2 Gbytes of
memory. The current maximum main memory is 512 Mbyte per slot. The DIMMs
comply with the following parameters:
TABLE C-6
Frequency
100Mhz (10ns)
C.6.3

SDRAM DIMM Configuration

The table below shows the different SDRAM DIMMs that can be used in the Sun
Blade 100 system.
TABLE C-7
DIMM
Mem Size
128 Mbyte
256 Mbyte
512 Mbyte
SDRAM DIMM Modules implement the Serial Presence Detect (SPD) mechanism. A
serial EEPROM on the DIMM module contains data programmed by the DIMM
manufacturers that identifies the module type and various SDRAM organization and
timing parameters. This information can be accessed through the System
Management bus (I2C bus).
DIMMs Performance Range
Clocks tRC tRAS
4 70ns 50ns
SDRAM size options (DIMMs only)
Configuration Technology
16Mx72 128 Mbit
2 * 16Mx72 128 Mbit
2 * 32Mx72 256 Mbit
tRP
20ns
# 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-17