75
M
M
X
X
4
4
6
6
U
U
2
2
-
-
G
G
N
N
/
/
M
M
X
X
4
4
6
6
-
-
5
5
3
3
3
3
G
G
N
N
O
O
n
n
l
l
i
i
n
n
e
e
M
M
a
a
n
n
u
u
a
a
l
l
also could be encrypted with pin code. With hopping rate of 1600 hops per second, it’s difficult to be intercepted and are less
interrupted by electromagnetic wave.
C
C
N
N
R
R
(
(
C
C
o
o
m
m
m
m
u
u
n
n
i
i
c
c
a
a
t
t
i
i
o
o
n
n
a
a
n
n
d
d
N
N
e
e
t
t
w
w
o
o
r
r
k
k
i
i
n
n
g
g
R
R
i
i
s
s
e
e
r
r
)
)
The CNR specification provides the PC industry the opportunity to deliver a flexible and cost reduced method of implementing LAN,
home networking, DSL, USB, wireless, audio and modem subsystems widely used in today's "connected PCs". The CNR
specification is an open industry specification and is supported by OEMs, IHV card manufacturers, silicon supplier and Microsoft.
D
D
D
D
R
R
(
(
D
D
o
o
u
u
b
b
l
l
e
e
D
D
a
a
t
t
a
a
R
R
a
a
t
t
e
e
)
)
R
R
A
A
M
M
(For ex, PC-100, PC-133) infrastructure and technology while doubling the nominal
bandwidth available to systems in an easy to design and simple to adopt way. Based on FSB frequency, DDR RAM on the market
are DDR200, DDR266 and DDR333 with more coming around soon.
DDR200
, transfer bandwidth up to 200x64/8=1600MB/s (PC1600)
DDR266
, transfer bandwidth up to 266x64/8=2100MB/s (PC2100)
DDR333
, transfer bandwidth up to 333x64/8=2700MB/s (PC2700)
DDR400
, transfer bandwidth up to 400x64/8=3200MB/s (PC3200)
E
E
C
C
C
C
(
(
E
E
r
r
r
r
o
o
r
r
C
C
h
h
e
e
c
c
k
k
i
i
n
n
g
g
a
a
n
n
d
d
C
C
o
o
r
r
r
r
e
e
c
c
t
t
i
i
o
o
n
n
)
)
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
