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M
X
3
4
M
X
3
4
S
I
M
M
(
S
i
n
g
l
e
S
I
M
M
(
S
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g
l
e
SIMM socket is only 72-pin, and is only single side. The golden finger signals on each side of PCB
are identical. That is why it was called Single In Line. SIMM is made by FPM or
supports 32-bit data. SIMM had been phased out on current motherboard design.
S
M
B
u
s
(
S
y
s
t
S
M
B
u
s
(
S
y
s
t
SMBus is also called I2C bus. It is a two-wire bus developed for component communication
(especially for semiconductor IC). For example, set clock of clock generator for jumper-less
motherboard. The data transfer rate of SMBus is only 100Kbit/s, it allows one host to communicate
with CPU and many masters and slaves to send/receive message.
S
P
D
(
S
e
r
i
a
l
P
S
P
D
(
S
e
r
i
a
l
P
SPD is a small ROM or
module information such as DRAM timing and chip parameters. SPD can be used by
decide best timing for this DIMM or RIMM.
U
l
t
r
a
D
M
A
/
3
3
U
l
t
r
a
D
M
A
/
3
3
Unlike traditional PIO/DMA mode, which only uses the rising edge of IDE command signal to
transfer data. UDMA/33 uses both rising edge and falling edge, the data transfer rate is double of
the PIO mode 4 or DMA mode 2.
I
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L
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M
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m
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D
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c
EEPROM
device resided on the
r
y
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r
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M
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)
n
t
B
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)
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t
B
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)
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DIMM
or RIMM. SPD stores memory
88
O
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l
i
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e
M
a
n
u
O
n
l
i
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e
M
a
n
EDO
DRAM and
BIOS
to
a
l
u
a
l
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