Input output interface

Aug 31, 2015Download as pptx, pdf19 likes22,832 views

This document provides an overview of input/output interfaces in 3 paragraphs. It discusses how I/O devices communicate differently than internal storage due to differences in operation, data transfer rates, word formats, and peripheral operating modes. It describes how interface modules connect I/O devices like keyboards, displays, printers and storage to the I/O bus and processor. Finally, it provides an example of an I/O interface unit that uses control and status registers to facilitate communication between a CPU and I/O device over control, data and status lines.

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Contents
Input Output Interface
I/O Bus and Interface Modules
I/O versus Memory Bus
Isolated (Port-Mapped) versus Memory-Mapped I/O
Example of I/O Interface

Input Output Interface
Internal storage & External I/O Devices
Direct Communication is not possible.
The major differences are:
 Different manner of operation
 Data transfer rate
 Difference in word format
 Difference in operating modes of peripherals

I/O Bus & Interface Module
Interface Interface Interface Interface
Keyboard
&
Display
Terminal
Printer
Magnetic
Disk
Magnetic
Tape
Data
Address
Control
I/O Bus
Processor
Fig. Connection of I/O Bus to input-output devices

IO Commands
There are four types of I/O Command:
 Control Command
 Status Command
 Output Data Command
 Input Data Command

I/O Versus Memory Bus
Like I/O Bus, Memory Bus also contains Data, Address
& Control Lines.
Three ways to communicate:
 Use two separate buses
 Use one common bus but separate control lines
 Use common bus with common control lines

Isolated versus Memory-Mapped I/O
ISOLATED I/O MEMORY MAPPED I/O
Separate read/write control
lines
A single set of read/write
control lines
Separate memory and I/O
address spaces
Common address space
Distinct input & output
instructions
No Specific input or output
instructions
- Considerable flexibility in
handling I/O operations

Example of an I/O Interface
I/O Data
Bus Buffers
Status
Register
Control
Register
Port B
Register
Port A
Register
CS
RS1
RS0
RD
WR
Timing
&
Control
Signal
InternalBus
Bidirectional
Data Bus
Chip Select
Register Select
I/O Read
I/O Write
To CPU To I/O Device
Control
I/O Data
Status
Fig. Example of an I/O Interface Unit

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Input output interface

1. DON’T JUST SIT THERE. YOU CAN LEARN INPUT OUTPUT INTERFACE IN QUICK 15 MINUTES.

2. Contents Input Output Interface I/O Bus and Interface Modules I/O versus Memory Bus Isolated (Port-Mapped) versus Memory-Mapped I/O Example of I/O Interface

3. Input Output Interface Internal storage & External I/O Devices Direct Communication is not possible. The major differences are:  Different manner of operation  Data transfer rate  Difference in word format  Difference in operating modes of peripherals

4. I/O Bus & Interface Module Interface Interface Interface Interface Keyboard & Display Terminal Printer Magnetic Disk Magnetic Tape Data Address Control I/O Bus Processor Fig. Connection of I/O Bus to input-output devices

5. IO Commands There are four types of I/O Command:  Control Command  Status Command  Output Data Command  Input Data Command

6. I/O Versus Memory Bus Like I/O Bus, Memory Bus also contains Data, Address & Control Lines. Three ways to communicate:  Use two separate buses  Use one common bus but separate control lines  Use common bus with common control lines

7. Isolated versus Memory-Mapped I/O ISOLATED I/O MEMORY MAPPED I/O Separate read/write control lines A single set of read/write control lines Separate memory and I/O address spaces Common address space Distinct input & output instructions No Specific input or output instructions - Considerable flexibility in handling I/O operations

8. Example of an I/O Interface I/O Data Bus Buffers Status Register Control Register Port B Register Port A Register CS RS1 RS0 RD WR Timing & Control Signal InternalBus Bidirectional Data Bus Chip Select Register Select I/O Read I/O Write To CPU To I/O Device Control I/O Data Status Fig. Example of an I/O Interface Unit

Input output interface

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Input output interface