MemoryīandīInterfacing
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Memory Interfacing - Electrical Engineering - Lecture Slides, Slides of Electrical Engineering
This lecture series is from Electrical Engineering courses. A collection of lectures on all the important topics in EE. These slides covers points such as: Memory and Interfacing, Example Block Diagram, Address Bus of 8085, Higher Order Address Bus, Lower Order Address, Address, Need for Demultiplexing, Generating Control Signals, Primary Memory, Memory Chip, Interfacing of Input Devices, Basic Ram Cell
Typology: Slides
2012/2013
1 / 55
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Memory
and
Interfacing
Index
-^ What
is^ an
Interface
-^ Pins
of^8085
used
in^ Interfacing
-^ Memory
- Microprocessor
Interface
ā¢^ I/O
- Microprocessor
Interface
-^ Basic
RAM
Cells
-^ Stack
Memory.
Example
Block
Diagram
Memory
Address
Lines Data
Lines Control
Lines Interface
Interfacing
Pins
Higher
Address
Bus
Lower
Address/Data
Bus
ALE
MIO/ RD WR^ READY
A^15
ā A
8 AD^7
ā AD
Higher
Order
Address
Bus
-^ The
higher
order
address
bus
is^ a
unidirectinal
bus. ā¢ It^ carries
most
significant
8 ābits
of^ a
bit
address
of^ memory
or^ I/O
device.
-^ Address
remains
on^
lines
as^ long
operation
is
not
completed.
Lower
Order
Address/Data
Bus
-^ This
bus
is^ bidirectional
and
works
on^
time
division
multiplexing
between
address
and
data. ā¢ During
first
clock
cycle,
it^ serves
as^ a
least
significant
8 ābits
of^ memory/
IO^
address.
-^ For
second
and
third
clock
cycles
it^ acts
as
data
bus
and
carries
data.
Need
for
Demultiplexingā¦
8085
Memory
20H 05H
2005H
RD
A^15
ā A^
8 AD^7
ā AD
0
4FH
Generating
Control
Signals
MIO/
Memory
Read
Memory
Write
IO^
Read IO^
Write
RD=0WR=
=^
1 1 1 0 0 1 0 0
Generating
Control
Signals
MIO/
Memory
Read
Memory
Write
IO^
Read IO^
Write
RD=1WR=
=^
1 0 1 1 0 0 0 1
Generating
Control
Signals
MIO/
Memory
Read
Memory
Write
IO^
Read IO^
Write
RD=1WR=
=^
0 0 0 1 1 0 1 1
Memory
Interface
-^ The
memory
is^ made
up^
of^ semiconductor
material
used
to^ store
the
programs
and
data.
The
types
of^ memory
is,
-^ Primary
or^ main
memory
-^ Secondary
memory
Secondary
Memory
-^ These
are
used
for
bulk
storage
of^
data
and
information.
-^ The
main
examples
include
Floppy,
Hard
Disk,
CD
āROM,
Magnetic
Tape
etc.
-^ Slower
and
Sequential
Access
Nature.
-^ non
āvolatile
nature.
Memory
Chip
Memory2n^ words ākā^ bits
per ākā^ data^ word
input
lines
ākā^ data
output
lines
ānā^ address
lines readwrite
Chip
select