Справочник Пользователя для Aopen mx4gv
92
M
M
X
X
4
4
G
G
V
V
O
O
n
n
l
l
i
i
n
n
e
e
M
M
a
a
n
n
u
u
a
a
l
l
P
P
a
a
r
r
i
i
t
t
y
y
B
B
i
i
t
t
The parity mode uses 1 parity bit for each byte, normally it is even parity mode, that is, each time the memory data is updated, parity bit will
be adjusted to have even count "1" for each byte. When next time, if memory is read with odd number of "1", the parity error is occurred
and this is called single bit error detection.
be adjusted to have even count "1" for each byte. When next time, if memory is read with odd number of "1", the parity error is occurred
and this is called single bit error detection.
P
P
B
B
S
S
R
R
A
A
M
M
(
(
P
P
i
i
p
p
e
e
l
l
i
i
n
n
e
e
d
d
B
B
u
u
r
r
s
s
t
t
S
S
R
R
A
A
M
M
)
)
For Socket 7 CPU, one burst data read requires four QWord (Quad-word, 4x16 = 64 bits). PBSRAM only needs one address decoding time
and automatically sends the remaining QWords to CPU according to a predefined sequence. Normally, it is 3-1-1-1, total 6 clocks, which is
faster than asynchronous SRAM. PBSRAM is often used on L2 (level 2) cache of Socket 7 CPU. Slot 1 and Socket 370 CPU do not need
PBSRAM.
and automatically sends the remaining QWords to CPU according to a predefined sequence. Normally, it is 3-1-1-1, total 6 clocks, which is
faster than asynchronous SRAM. PBSRAM is often used on L2 (level 2) cache of Socket 7 CPU. Slot 1 and Socket 370 CPU do not need
PBSRAM.
P
P
C
C
-
-
1
1
0
0
0
0
D
D
I
I
M
M
M
M
DIMM that supports 100MHz CPU
bus clock.
P
P
C
C
-
-
1
1
3
3
3
3
D
D
I
I
M
M
M
M
DIMM that supports 133MHz CPU
bus clock.