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4.2 RAM organization
The block diagram of a RAM chip is shown in figure.
Figure : Block diagram of RAM
Address signals:
The RAM chip needs address inputs to select the required memory location.
The following table shows the number of address inputs (or lines) required for
n
addressing the memory locations. If there are „n‟ address lines, then the memory have 2
locations.
Address lines Memory Size (No. of locations)
n
(n) (2 )
4 16
8 256
10 1024 (1 Kilo)
11 2048 (2 Kilo)
12 4096 (4 Kilo)
13 8192 (8 Kilo)
14 16384 (16 Kilo)
15 32768 (32 Kilo)
16 65536 (64 Kilo)
Table : Address lines and Memory size
Data signals:
The data is given through the Data Inputs lines and the stored data is taken from the Data
Outputs lines.
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