<s>
A	O
memory	B-General_Concept
bank	I-General_Concept
is	O
a	O
logical	O
unit	O
of	O
storage	O
in	O
electronics	O
,	O
which	O
is	O
hardware-dependent	O
.	O
</s>
<s>
In	O
a	O
computer	O
,	O
the	O
memory	B-General_Concept
bank	I-General_Concept
may	O
be	O
determined	O
by	O
the	O
memory	B-General_Concept
controller	I-General_Concept
along	O
with	O
physical	O
organization	O
of	O
the	O
hardware	B-Architecture
memory	B-General_Concept
slots	O
.	O
</s>
<s>
In	O
a	O
typical	O
synchronous	O
dynamic	O
random-access	O
memory	B-General_Concept
(	O
SDRAM	O
)	O
or	O
double	O
data	O
rate	O
SDRAM	O
(	O
DDR	O
SDRAM	O
)	O
,	O
a	O
bank	O
consists	O
of	O
multiple	O
rows	O
and	O
columns	O
of	O
storage	O
units	O
,	O
and	O
is	O
usually	O
spread	O
out	O
across	O
several	O
chips	O
.	O
</s>
<s>
In	O
a	O
single	O
read	O
or	O
write	O
operation	O
,	O
only	O
one	O
bank	O
is	O
accessed	O
,	O
therefore	O
the	O
number	O
of	O
bits	O
in	O
a	O
column	O
or	O
a	O
row	O
,	O
per	O
bank	O
and	O
per	O
chip	O
,	O
equals	O
the	O
memory	B-General_Concept
bus	O
width	O
in	O
bits	O
(	O
single	O
channel	O
)	O
.	O
</s>
<s>
Some	O
computers	O
have	O
several	O
identical	O
memory	B-General_Concept
banks	I-General_Concept
of	O
RAM	O
,	O
and	O
use	O
bank	B-General_Concept
switching	I-General_Concept
to	O
switch	O
between	O
them	O
.	O
</s>
<s>
Harvard	B-Architecture
architecture	I-Architecture
computers	O
have	O
(	O
at	O
least	O
)	O
two	O
very	O
different	O
banks	O
of	O
memory	B-General_Concept
,	O
one	O
for	O
program	O
storage	O
and	O
other	O
for	O
data	O
storage	O
.	O
</s>
<s>
A	O
memory	B-General_Concept
bank	I-General_Concept
is	O
a	O
part	O
of	O
cache	B-General_Concept
memory	I-General_Concept
that	O
is	O
addressed	O
consecutively	O
in	O
the	O
total	O
set	O
of	O
memory	B-General_Concept
banks	I-General_Concept
,	O
i.e.	O
,	O
when	O
data	O
item	O
is	O
stored	O
in	O
bank	O
,	O
data	O
item	O
is	O
stored	O
in	O
bank	O
.	O
</s>
<s>
Cache	B-General_Concept
memory	I-General_Concept
is	O
divided	O
in	O
banks	O
to	O
evade	O
the	O
effects	O
of	O
the	O
bank	O
cycle	O
time	O
(	O
see	O
above	O
)	O
[=	O
>	O
missing	O
"	O
bank	O
cycle	O
"	O
definition	O
,	O
above ]	O
.	O
</s>
<s>
The	O
number	O
of	O
memory	B-General_Concept
modules	O
needed	O
to	O
have	O
the	O
same	O
number	O
of	O
data	O
bits	O
as	O
the	O
bus	O
.	O
</s>
<s>
A	O
bank	O
can	O
consist	O
of	O
one	O
or	O
more	O
memory	B-General_Concept
modules	O
.	O
</s>
