 |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
| ä |
RAM
(Random access memory)
|
|
|
|
ä |
Contents
of cells may be read or written during
|
|
|
operation
of device
|
|
|
|
ä |
Reading
a cell is similar to ROM
|
|
|
|
ä |
To
write:
|
|
|
|
ä |
Select
cell using address bus
|
|
|
|
ä |
Value
on data bus replaces contents of cell
|
|
|
|
ä |
Synchronize
using the control bus signals
|
|
|
|
ä |
Properties
|
|
|
|
ä |
Contents
are lost if power is removed from
|
|
|
|
component
|
|
|
|
ä |
Once
value of a cell is written, value in cell
|
|
|
remains
the same until it is overwritten or power
|
|
is
turned off
|
|
|
|
ä |
Contents
typically unknown when power is first
|
|
|
applied
|
|
