PCchips M902 Series, User Manual

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2: Mainboard Installation
Installing Memory Modules
This mainboard accommodates 168-pin 3.3V/184-pin 2.5V
unbuffered SDRAM memory modules. The memory chips must be
standard or registered SDRAM (Synchronous Dynamic Random
Access Memory).
The CPU supports 100MHz system bus. The SDRAM DIMMs
and DDRs can synchronously work with 100 MHz or operates over
a 133 MHz memory bus.
You must install at least one memory module in order to use
the mainboard,
either SDRAM or DDR SDRAM, but you
cannot use them simultaneously
.
Note: Please be noted you must set up the correct jumper settings
(JP1 and JT1~JT10) as described in page 13 of this chapter.
SDRAM provides 800 MB/s or 1 GB/s data transfer rate
corresponding with the bus 100 MHz or 133 MHz. It doubles the
rate to 1.6 GB/s and 2.1 GB/s by transferring data on both the
rising and falling edges of the clock. DDR SDRAM uses additional
power and ground lines and requires 184-pin 2.5V unbuffered
DIMM module rather than the 168-pin 3.3V unbuffered DIMMs
used by SDRAM.
11
DDR2
DDR1
DIMM2
DIMM1