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A
X
4
B
/
A
X
4
B
P
A
X
4
B
/
A
X
4
B
P
D
D
M
M
A
A
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D
D
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r
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c
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M
M
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m
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Channel for communications between the memory and surrounding devices.
E
C
C
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E
r
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r
C
h
e
c
k
i
E
C
C
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E
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r
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The ECC mode needs 8 ECC bits for 64-bit data. Each time memory is accessed; ECC bits are updated and checked by a
special algorithm. The ECC algorithm has the ability to detect double-bit error and automatically correct single-bit error while
parity mode can only detect single-bit error.
E
D
O
(
E
x
t
e
n
d
e
d
D
a
E
D
O
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E
x
t
e
n
d
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d
D
a
The EDO DRAM technology is actually very similar to FPM (Fast Page Mode). Unlike traditional FPM that tri-states the memory
output data to start the pre-charge activity, EDO DRAM holds the memory data valid until the next memory access cycle, that is
similar to pipeline effect and reduces one clock state.
E
E
P
R
O
M
(
E
l
e
c
t
r
o
n
E
E
P
R
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M
(
E
l
e
c
t
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o
n
2
Also known as E
PROM. Both EEPROM and
technology is different. Size of EEPROM is much smaller than flash ROM.
E
P
R
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M
(
E
r
a
s
a
b
l
e
E
P
R
O
M
(
E
r
a
s
a
b
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e
Traditional motherboard stores BIOS code in EPROM. EPROM can only be erased by ultra-violet (UV) light. If BIOS has to be
upgraded, you need to remove EPROM from motherboard, clear by UV light, re-program, and then insert back.
r
o
r
o
r
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y
A
A
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n
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d
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P
r
o
g
r
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c
E
r
a
s
a
b
l
e
P
r
o
g
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Flash ROM
P
r
o
g
r
a
m
m
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b
l
e
R
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P
r
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g
r
a
m
m
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b
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)
m
m
a
b
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)
a
m
m
a
b
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R
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)
can be re-programmed by electronic signals, but the interface
M
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93
O
n
l
i
n
e
M
a
n
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l
O
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l
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M
a
n
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a
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Table of Contents
Troubleshooting
