CHAPTER 2 –Ha
r
dwa
r
e
I
n
s
tallatio
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s
SPI-6941-LV 11
2
.
3
M
a
in
M
e
m
o
r
y
In
s
t
a
ll
a
t
ion
:
D
I
MM
1
/
D
I
MM
2
/
D
I
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3
The SPI-6941-LV PCIMG PCI/ISA Industrial CPU Card supports three dual inline
memory module (DIMM 168-pin) sockets for a maximum total memory of 1.5GB. Using the
serial presence detect (SPD) data structure, programmed into an E
2
PROM on the DIMM, the
BIOS can determine the SDRAM’s size and speed. For each slot, minimum memory size is
64MB; maximum memory size is 512MB. Memory size and speed can vary between sockets.
The CPU card supports the following memory features:
• 168-pin DIMMs with gold-plated contacts
• 100 MHz or 133MHz SDRAM
• Non-ECC (64-bit) and ECC (72-bit) memory
• 3.3V memory only
• Unbuffered single or double-sided DIMMs in the following sizes:
S
D
RA
M
S
YNC
H
R
O
N
O
U
S
DRAM (SDRAM) improves memory performance through memory
access that is synchronous with the memory clock. Burst transfer rates at x-1-1-1 timing can be
achieved using SDRAM, while asynchronous memory subsystems are typically limited at x-
2-2-2 transfer rates.
The CPU card supports single or double-sided DIMMs in the following sizes:
D
I
MM
s
i
z
e
N
on
-
E
CC
c
on
f
i
gu
r
a
t
i
on
E
CC
c
on
f
i
gu
r
a
t
i
on
64MB 8Mbit x 64 8Mbit x 72
128MB 16Mbit x 64 16Mbit x 72
256MB 32Mbit x 64 32Mbit x 72
512MB 64Mbit x 64 64Mbit x 72
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