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A
K
7
7
-
4
0
0
/
A
K
A
K
7
7
-
4
0
0
/
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E
E
C
C
C
C
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(
E
E
r
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r
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r
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C
C
h
h
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c
c
k
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n
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g
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a
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d
d
C
C
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
E
E
P
P
R
R
O
O
M
M
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(
E
E
l
l
e
e
c
c
t
t
r
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o
o
n
n
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c
c
E
E
r
r
a
a
s
s
a
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2
Also known as E
PROM. Both EEPROM and
technology is different. Size of EEPROM is much smaller than flash ROM.
E
P
R
O
M
(
E
r
a
s
a
b
l
e
P
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o
g
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m
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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.
E
E
V
V
6
6
B
B
u
u
s
s
EV6 Bus is the technology of Alpha processor from Digital Equipment Corporation. EV6 bus uses both rising and falling clock
edge to transfer data, similar as DDR RAM or ATA/66 IDE bus.
EV6 Bus Speed = CPU external bus clock x 2.
200 MHz EV6 bus, 200MHz = 100 MHz external bus clock x 2
7
7
-
4
0
0
N
/
A
K
7
7
7
7
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N
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7
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r
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n
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)
)
b
b
l
l
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P
P
r
r
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g
g
r
r
a
a
m
m
m
m
a
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b
b
l
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R
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)
)
Flash ROM
m
a
b
l
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R
O
M
)
m
a
b
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R
O
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)
-
4
0
0
M
a
x
-
4
0
0
M
a
x
can be re-programmed by electronic signals, but the interface
110
O
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l
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e
M
a
n
u
a
l
O
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l
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M
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n
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a
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