AOpen MX3L, Руководство пользователя

Страница: 36 / 83

Hardware Installation
2-15
2.4 Configuring the System Memory
Pin1
The DIMM types supported are EDO
(Extended Data Out) and SDRAM
(Synchronous DRAM). This mainboard has
three 168-pin DIMM sockets (Dual-in-line
Memory Module) that allow you to install
system memory up to
768MB EDO DRAM
or 384MB SDRAM .
DIMM modules can be identified by the following factors:
I. Size: single side, 1Mx64 (8MB), 2Mx64 (16MB), 4Mx64 (32MB), 8Mx64
(64MB), 16Mx64 (128MB), and double side, 1Mx64x2 (16MB), 2Mx64x2
(32MB), 4Mx64x2 (64MB), 8Mx64x2 (128MB).
Tip: Here is a trick to check if your DIMM is
single-side or double-side -- if there are traces
connected to golden finger pin 114 and pin 129 of
the DIMM, the DIMM is probably double-side;
otherwise, it is single-side. The following figure is
for your reference.
168
85
Pin 129
Pin 114
II. Speed:
SDRAM: normally marked as -12, which means the clock cycle time is 12ns
and maximum clock of this SDRAM is 83MHz. Sometimes you can also
find the SDRAM marked as -67, which means maximum clock is 67MHz.
EDO: the access time of EDO RAM can be 50ns or 60ns.