Chapter 2
16
2-6 Main Memory Configuration
The DRAM memory system on board consists of 3 banks, and the memory range is
8 ~ 256 MBytes. You must install 2 SIMM modules(same size, same speed, either
single or double sided) in each bank at a time. It does not matter which bank you
install first.
DRAM Specifications
Types Supported
FP(Fast Page), EDO(Extended Data Output) and
Synchronous DRAM
Speed requirement
FP/EDO: 70-ns (or faster) for 50 or 60MHz system
frequency and 60-ns for 66MHz system
frequency.
SDRAM: 10/12ns
Module types & sizes
4/8/16/32/64 MBytes, single/double-sided, 5v SIMM
8/16/32/64 MBytes, single/double-sided, 3.3v DIMM
Parity
Both parity and non-parity modules may be used
however the parity function is not supported by this
mainboard.
Most SDRAM will be 3.3V only (i.e. SDRAM I/O pins will not be 5V
tolerant). It is not recommended to mix 3.3V EDO/SDRAM DIMM with
5V EDO/FPM SIMM.
Because 64/128MB DIMM is not yet mainstream, the compatibility of 64/
128MB DIMM can not be 100% guaranteed.
Due to loading anomalies, using DIMM with an 'n x 4' DRAM base on this
mainboard is not recommended. For example, a DIMM that uses sixteen
16Mb x 4 devices should not be used.
SIMM
72-pin 5V SIMM
Qty.
Bank2
(SIMM1,SIMM2)
4/8/16/32/64 FPM or EDO SIMM
(DIMM sockets must be empty)
x2
DIMM
168-pin 3.3V unbuffered DIMM
Qty.
Bank0 (DIMM1)
8/16/32/64/128 MB EDO or SDRAM
(SIMM sockets must be empty)
x 1
Bank1 (DIMM2)
8/16/32/64/128 MB EDO or SDRAM
(SIMM sockets must be empty)
x 1
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