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M
X
4
B
M
X
4
B
E
E
C
C
C
C
(
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E
E
r
r
r
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o
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C
C
h
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c
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k
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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
E
D
D
O
O
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E
E
x
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t
e
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n
n
d
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d
d
D
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a
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
E
E
P
P
R
R
O
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M
M
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E
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c
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2
Also known as E
PROM. Both EEPROM and
is different. Size of EEPROM is much smaller than flash ROM.
E
P
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E
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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.
n
n
g
g
a
a
n
n
d
d
C
C
o
o
r
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r
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c
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t
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i
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o
n
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t
a
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M
M
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m
m
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r
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y
y
i
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c
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E
E
r
r
a
a
s
s
a
a
b
b
l
l
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P
P
r
r
o
o
g
g
r
r
a
Flash ROM
P
r
o
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r
a
m
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P
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m
m
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can be re-programmed by electronic signals, but the interface technology
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M
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M
a
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