Contec PC-686BX(NLX)-LV, Руководство пользователя

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3. Hardware Description
PC-686BX(NLX)-LV, PC-686BX(NLX)-LVV
15
Main Memory Installation: DIMM1 and DIMM2
The board provides two dual in-line memory module (168-pin DIMM) sockets giving
a maximum memory size of 512MB.
The BIOS determines the SDRAM size and speed using in the serial presence
detection (SPD) data structure set in E2PROM on the DIMM. The minimum
memory size is 32MB and the maximum is 512MB. The memory size and speed can
be different for each socket.
The CPU board supports the following memory functions.
- 168-pin DIMM, metal plated earth
- 100MHz SDRAM (PC-100)
- Non-ECC (64-bit) or ECC (72-bit) memory
- 3.3V memory only
- Unbuffered single-port or dual-port DIMMs in the following sizes
SDRAM
Synchronous DRAM (SDRAM) achieves improved memory performance by
performing memory access synchronized by the memory clock. Whereas SDRAM
can achieve burst transfer speed with x-1-1-1 timing, asynchronous memory sub-
systems are generally restricted to x-2-2-2 transfer speed.
The CPU board supports single-port or dual-port DIMMs in the following sizes.
Table 3.2. SDRAM
DIMM Size Non-ECC ECC
32MB 4Mbit×64 ---
64MB 8Mbit×64 8Mbit×72
128MB 16Mbit×64 16Mbit×72
256MB 32Mbit×64 32Mbit×72
Note!
All memory components and DIMMs used with this board must
comply with the PC SDRAM specification. The PC SDRAM
specification specifies the specifications for PC SDRAM (specific to
memory components), the specifications for DIMMs with no PC
buffer, PC serial presence detection specifications, and similar.