Memory Hierarchy RAM Memory Chip Organization ROM Flash Memory Types of Programming Languages Compiler vs Interpreter vs Assembler Types of programming languages Compiler vs interpreter vs assembler high level language vs assembly level language vs low level language

1. Computer Memory
Types of
Programming Languages
By: Prof. Ganesh Ingle

2. Memory Hierarchy
RAM
Memory Chip Organization
ROM
Flash Memory
Types of Programming Languages
Compiler vs Interpreter vs Assembler
References

3. Slow and
inexpensive
Increasing performance
and
increasing cost

6. Registers
 top in the hierarchy
 matched in speed to the CPU
 but are large and consume significant power
 number of registers in a processor are small
Secondary and off-line storage devices
 at the bottom of the hierarchy
 cost per stored bit small in terms of money
and power
 but access time is very long compared to
registers

7. The term “random” means any memory
location can be accessed in the same
amount of time regardless of its position
in the memory.
Volatile memory
Types of RAM:
• SRAM
• DRAM

8. Static RAM (SRAM) based on flip flops
Contents of each location persist as long
as power is applied.
Fast but relatively large
Consume a lot of power
Used for memory applications that are
small but fast

9. Dynamic RAM (DRAM) employ capacitors
Capacitor stores electric charge whose
level represents a 1 or 0
Capacitors dissipate with time and hence
the charge must be restored frequently
DRAMs
smaller, slower than SRAMs
support low cost, low power and high density and
hence used in main memory

10. During read operation:
• Entire row is selected
• It is fed into the column MUX
• MUX selects a single bit for output
During write operation:
• Single bit to be written is distributed by the
DEMUX to the target column
• Row decoder selects the proper column to be
written

11.  Data stored in these chips is nonvolatile -
- it is not lost when power is turned off.
On turn on, the computer loads BIOS from
ROM
Data stored in these chips is either
unchangeable or requires a special
operation to change
Applications:Videogames, calculators,
microwave oven, etc

12. Lets see the circuit for a ROM that stores
four four-bit words(0101, 1011, 1110,
0000)
PROM burner allows contents of the ROM
to be overwritten only once
EPROMs – could be written several times
EEPROMs – allow the content to be
rewritten electrically

13. A section of memory cells can be erased
in a single step, or 'flash', thus the name
Nonvolatile memory
Flash memory is used for easy and fast
information storage in such devices as
digital cameras, mobile, video game
consoles

17. System Software
 A system software aids the user and the hardware to function and interact with each
other.
 It is a software to manage computer hardware behaviour so as to provide basic
functionalities that are required by the user. In simple words, we can say that system
software is an intermediate or a middle layer between the user and the hardware.
 These computer software sanction a platform or environment for the other software to
work in.
 This is the reason why system software is very important in managing the entire
computer system.
 When you first turn on the computer, it is the system software that gets initialized and
gets loaded in the memory of the system.
 The system software runs in the background and is not used by the end-users. This is
the reason why system software is also known as ‘low-level software’.

18. Application Software
 Application Software, also known as end-user programs or productivity programs are
software that helps the user in completing tasks such as doing online research, jotting
down notes, setting an alarm, designing graphics, keeping an account log, doing
calculations or even playing games.
 They lie above the system software. Unlike system software, they are used by the
end-user and are specific in their functionality or tasks and do the job that they are
designed to do. For example, a browser is an application designed specifically for
browsing the internet or MS Powerpoint is an application used specifically for making
presentations.
 Application Software or simply apps can also be referred to as non-essential software
as their requirement is highly subjective and their absence does not affect the
functioning of the system.
 All the apps that we see on our mobile phones are also examples of Application
Software. There is certain software that is exclusively made for app development like
Meteor and Flutter. These are examples of Application software too.