M
M
X
X
4
4
6
6
S
S
O
O
n
n
l
l
i
i
n
n
e
e
M
M
a
a
n
n
u
u
a
a
l
l
R
R
I
I
M
M
M
M
(
(
R
R
a
a
m
m
b
b
u
u
s
s
I
I
n
n
l
l
i
i
n
n
e
e
M
M
e
e
m
m
o
o
r
r
y
y
M
M
o
o
d
d
u
u
l
l
e
e
)
)
184-pin memory module supports
RDRAM
memory technology. A RIMM memory module may contain up to maximum of 16 RDRAM
devices.
S
S
D
D
R
R
A
A
M
M
(
(
S
S
y
y
n
n
c
c
h
h
r
r
o
o
n
n
o
o
u
u
s
s
D
D
R
R
A
A
M
M
)
)
SDRAM is one of the DRAM technologies that allow DRAM to use the same clock as the CPU host bus (
EDO
and FPM are asynchronous
and do not have clock signal). It is similar as
PBSRAM
to use burst mode transfer. SDRAM comes in 64-bit 168-pin
DIMM
and operates at
3.3V. Our company is the first company to support dual-SDRAM DIMMs onboard (AP5V), from Q1 1996
S
S
h
h
a
a
d
d
o
o
w
w
E
E
2
2
P
P
R
R
O
O
M
M
A memory space in Flash-ROM to simulate E
2
PROM operation, our motherboard uses Shadow E
2
PROM for jumper-less and battery-less
design
S
S
I
I
M
M
M
M
(
(
S
S
i
i
n
n
g
g
l
l
e
e
I
I
n
n
L
L
i
i
n
n
e
e
M
M
e
e
m
m
o
o
r
r
y
y
M
M
o
o
d
d
u
u
l
l
e
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
EDO
DRAM and supports 32-bit data. SIMM had been phased out on current motherboard design.
85
