PPT - Memory and IO Interfacing Computer Science Engineering (CSE) Notes | EduRev

Computer Science Engineering (CSE) : PPT - Memory and IO Interfacing Computer Science Engineering (CSE) Notes | EduRev

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Memory and I/O Interfacing
1 of 55
Page 2


Memory and I/O Interfacing
1 of 55
What is an Interface
•
an interface is a concept that refers to a point of 
interaction between components, and is 
applicable at the level of both hardware and 
software. 
•
This allows a component, (such as a graphics card 
or an Internet browser), to function 
independently while using interfaces to 
communicate with other components via an 
input/output system and an associated protocol.
2
Page 3


Memory and I/O Interfacing
1 of 55
What is an Interface
•
an interface is a concept that refers to a point of 
interaction between components, and is 
applicable at the level of both hardware and 
software. 
•
This allows a component, (such as a graphics card 
or an Internet browser), to function 
independently while using interfaces to 
communicate with other components via an 
input/output system and an associated protocol.
2
Example Block Diagram
8085
Memory
Address Lines
Data Lines
Control Lines 
Interface
3
Page 4


Memory and I/O Interfacing
1 of 55
What is an Interface
•
an interface is a concept that refers to a point of 
interaction between components, and is 
applicable at the level of both hardware and 
software. 
•
This allows a component, (such as a graphics card 
or an Internet browser), to function 
independently while using interfaces to 
communicate with other components via an 
input/output system and an associated protocol.
2
Example Block Diagram
8085
Memory
Address Lines
Data Lines
Control Lines 
Interface
3
8085 Interfacing Pins
8085
Higher Address Bus
Lower Address/Data Bus
ALE
M IO/
RD
WR
READY
A
15
 – A
8
AD
7
 – AD
0
4
Page 5


Memory and I/O Interfacing
1 of 55
What is an Interface
•
an interface is a concept that refers to a point of 
interaction between components, and is 
applicable at the level of both hardware and 
software. 
•
This allows a component, (such as a graphics card 
or an Internet browser), to function 
independently while using interfaces to 
communicate with other components via an 
input/output system and an associated protocol.
2
Example Block Diagram
8085
Memory
Address Lines
Data Lines
Control Lines 
Interface
3
8085 Interfacing Pins
8085
Higher Address Bus
Lower Address/Data Bus
ALE
M IO/
RD
WR
READY
A
15
 – A
8
AD
7
 – AD
0
4
Address Bus of 8085
•
Address Bus
–
Used to address memory & I/O devices
–
8085 has a 16-bit address bus
A
15
A
14
A
13
A
12
A
11
A
10
A
9
A
8
AD
7
AD
6
AD
5
AD
4
AD
3
AD
2
AD
1
AD
0
Lower-order Address Higher-order Address
?
Data Bus
?
Used to transfer instructions and data
?
8085 has a 8-bit data bus
Data Bus
5
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