American Megatrends Atlas PCI-II, User Manual

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Atlas PCI-II Motherboard User’s Guide 12
Step 3 Install Memory
System Memory There are four 32 -bit DIMM/SIMM – Single (or
Double) Inline Memory Module) sockets. Memory
must be populated one bank at a time. Each bank
has two sockets. Bank0 includes U10 and U7. Bank1
includes U5 and U2. Each bank must be populated
with the same type of SIMM/DIMM. If a 1 MB
SIMM is installed in the first socket in Bank0, then
the same type of 1 MB SIMM must be installed in
the second Bank0 SIMM socket. Each socket can
hold one SIMM or DIMM. You can use: 256 KB x 32
(or 36), 512 KB x 32 (or 36), 1 MB x 32 (or 36), 2 MB x
32 (or 36), 4 MB x 32 (or 36), 8 MB x 32 (or 36), or 16
MB x 32 (or 36) SIMMs.
The motherboard supports banks of fast page mode
and EDO (Extended Data Out) memory together
operating at 60 or 70
ns (RAS access time). Set the
Chipset Setup DRAM Speed for EDO option
correctly if using EDO memory.
Memory Display System memory is reported by AMIBIOS as it boots
and again when the AMIBIOS System
Configuration Screen is displayed just before the
operating system boots. The memory displayed by
AMIBIOS on the System Configuration Screen is
384 KB less than the total memory installed.
Select SIMMs SIMMs must meet the following specifications:
Parameter Specification
Page Mode FAST
Refresh CAS before RAS
t
CAC
≤
20 ns
t
RAC
≤
80 ns
t
AA
≤
45 ns
t
RP
70 ns
t
CPA
≤
45 ns
Cont’d