This document compares polling/interrupt-driven I/O and DMA, describing their operations and overheads. It then explains that DMA uses a controller to transfer large blocks of data between I/O devices and memory without continuous processor intervention, reducing overhead. The DMA controller is programmed by the processor and raises interrupts to signal transfer completion. It allows high-speed transfer and sharing of bus access through techniques like cycle stealing and arbitration.
DMA stands for Direct memory access and is a method of transferring data from the computers RAM to another part of the computer without processing it using the CPU.
DMA stands for Direct memory access and is a method of transferring data from the computers RAM to another part of the computer without processing it using the CPU.
Introduction of memory Segmentation
Segmentation is the process in which the main memory of the computer is logically divided into different segments and each segment has its own base address.
Memory segmentation is the methods where whole memory is divided into the smaller parts called segments of various sizes.
A segment is just an area in memory.
The process of dividing memory this way is called segmentation.
Direct Memory Access (DMA)-Working and ImplementationShubham Kumar
DMA is an important functionality of any computing system involving transfer of data from/to an I/O device. In this presentation, a brief description has been provided regarding how the DMA functionality is implemented on a normal PC as well as on an Intel Quark SoC based small Embedded System.Different implementations of the DMA functionality depend on the Controller Hub present on the SouthBridge of the MotherBoard of the respective platform.For example->DMA implementation in Intel ICH7 is different from those in Intel ICH to Intel ICH6. In the slides, "Galileo" refers to the Intel Galileo Board containing Intel Quark SoC. Intel Galileo Board contains Designware DMA controllers." dmatest.c " is a memory-to-memory data transfer test driver implementing DMA. This module is loaded and then memcpy is checked using dmesg. Do take a look at the "External Links and References" given at the end of the PPT.
In these slides the registration organization and stack organization have discussed in detail. Stack organization is discussed with the aid of animation to let the user understand it in a better and easy way.
Introduction of memory Segmentation
Segmentation is the process in which the main memory of the computer is logically divided into different segments and each segment has its own base address.
Memory segmentation is the methods where whole memory is divided into the smaller parts called segments of various sizes.
A segment is just an area in memory.
The process of dividing memory this way is called segmentation.
Direct Memory Access (DMA)-Working and ImplementationShubham Kumar
DMA is an important functionality of any computing system involving transfer of data from/to an I/O device. In this presentation, a brief description has been provided regarding how the DMA functionality is implemented on a normal PC as well as on an Intel Quark SoC based small Embedded System.Different implementations of the DMA functionality depend on the Controller Hub present on the SouthBridge of the MotherBoard of the respective platform.For example->DMA implementation in Intel ICH7 is different from those in Intel ICH to Intel ICH6. In the slides, "Galileo" refers to the Intel Galileo Board containing Intel Quark SoC. Intel Galileo Board contains Designware DMA controllers." dmatest.c " is a memory-to-memory data transfer test driver implementing DMA. This module is loaded and then memcpy is checked using dmesg. Do take a look at the "External Links and References" given at the end of the PPT.
In these slides the registration organization and stack organization have discussed in detail. Stack organization is discussed with the aid of animation to let the user understand it in a better and easy way.
This slide deals with the Input-Output Channel of an IBM 370 computer. It includes three Block diagrams of the I-O channels as well as the Memory Unit with the Description of each and every diagrams.
PyCoRAM: Yet Another Implementation of CoRAM Memory Architecture for Modern F...Shinya Takamaeda-Y
Presentation slide for CARL2013 (Co-located with MICRO-46) at Davis, CA.
PyCoRAM: Yet Another Implementation of CoRAM Memory Architecture for Modern FPGA-based Computing
Interrupt programming with 8051 microcontrollerAnkit Bhatnagar
this ppt is related to the intrupts related to the 8051 microcontroller ..
topics are introduction to intrupts
intrerrupts vs pollings
difference between intrupts snd pollings
DMA Versus Polling or Interrupt Driven I/Osathish sak
Polling and Interrupt driven I/O concentrates on data transfer between the processor and I/O devices.
An instruction to transfer (mov datain,R0) only occurs after the processor determines that the I/O device is ready
Either by polling a status flag in the device interface or
Waits for the device to send an interrupt request.
Considerable overhead is incurred, because several program instructions must be executed for each data word transferred.
Instructions are needed to increment memory address and keeping track of work count.
With interrupts, additional overhead associated with saving and restoring the program counter and other state information.
This PPT describe the use of direct memory access and how the input and output devices exchange the data with processor without interruption like waiting for address fetch.
In many I/O interfacing applications and certainly in data acquisation system. it is often necessary to transfer data to or from an interface at data rates higher than those possible using simple programmed I/O loops
Acetabularia Information For Class 9 .docxvaibhavrinwa19
Acetabularia acetabulum is a single-celled green alga that in its vegetative state is morphologically differentiated into a basal rhizoid and an axially elongated stalk, which bears whorls of branching hairs. The single diploid nucleus resides in the rhizoid.
Introduction to AI for Nonprofits with Tapp NetworkTechSoup
Dive into the world of AI! Experts Jon Hill and Tareq Monaur will guide you through AI's role in enhancing nonprofit websites and basic marketing strategies, making it easy to understand and apply.
Read| The latest issue of The Challenger is here! We are thrilled to announce that our school paper has qualified for the NATIONAL SCHOOLS PRESS CONFERENCE (NSPC) 2024. Thank you for your unwavering support and trust. Dive into the stories that made us stand out!
Honest Reviews of Tim Han LMA Course Program.pptxtimhan337
Personal development courses are widely available today, with each one promising life-changing outcomes. Tim Han’s Life Mastery Achievers (LMA) Course has drawn a lot of interest. In addition to offering my frank assessment of Success Insider’s LMA Course, this piece examines the course’s effects via a variety of Tim Han LMA course reviews and Success Insider comments.
Francesca Gottschalk - How can education support child empowerment.pptxEduSkills OECD
Francesca Gottschalk from the OECD’s Centre for Educational Research and Innovation presents at the Ask an Expert Webinar: How can education support child empowerment?
Synthetic Fiber Construction in lab .pptxPavel ( NSTU)
Synthetic fiber production is a fascinating and complex field that blends chemistry, engineering, and environmental science. By understanding these aspects, students can gain a comprehensive view of synthetic fiber production, its impact on society and the environment, and the potential for future innovations. Synthetic fibers play a crucial role in modern society, impacting various aspects of daily life, industry, and the environment. ynthetic fibers are integral to modern life, offering a range of benefits from cost-effectiveness and versatility to innovative applications and performance characteristics. While they pose environmental challenges, ongoing research and development aim to create more sustainable and eco-friendly alternatives. Understanding the importance of synthetic fibers helps in appreciating their role in the economy, industry, and daily life, while also emphasizing the need for sustainable practices and innovation.
The Roman Empire A Historical Colossus.pdfkaushalkr1407
The Roman Empire, a vast and enduring power, stands as one of history's most remarkable civilizations, leaving an indelible imprint on the world. It emerged from the Roman Republic, transitioning into an imperial powerhouse under the leadership of Augustus Caesar in 27 BCE. This transformation marked the beginning of an era defined by unprecedented territorial expansion, architectural marvels, and profound cultural influence.
The empire's roots lie in the city of Rome, founded, according to legend, by Romulus in 753 BCE. Over centuries, Rome evolved from a small settlement to a formidable republic, characterized by a complex political system with elected officials and checks on power. However, internal strife, class conflicts, and military ambitions paved the way for the end of the Republic. Julius Caesar’s dictatorship and subsequent assassination in 44 BCE created a power vacuum, leading to a civil war. Octavian, later Augustus, emerged victorious, heralding the Roman Empire’s birth.
Under Augustus, the empire experienced the Pax Romana, a 200-year period of relative peace and stability. Augustus reformed the military, established efficient administrative systems, and initiated grand construction projects. The empire's borders expanded, encompassing territories from Britain to Egypt and from Spain to the Euphrates. Roman legions, renowned for their discipline and engineering prowess, secured and maintained these vast territories, building roads, fortifications, and cities that facilitated control and integration.
The Roman Empire’s society was hierarchical, with a rigid class system. At the top were the patricians, wealthy elites who held significant political power. Below them were the plebeians, free citizens with limited political influence, and the vast numbers of slaves who formed the backbone of the economy. The family unit was central, governed by the paterfamilias, the male head who held absolute authority.
Culturally, the Romans were eclectic, absorbing and adapting elements from the civilizations they encountered, particularly the Greeks. Roman art, literature, and philosophy reflected this synthesis, creating a rich cultural tapestry. Latin, the Roman language, became the lingua franca of the Western world, influencing numerous modern languages.
Roman architecture and engineering achievements were monumental. They perfected the arch, vault, and dome, constructing enduring structures like the Colosseum, Pantheon, and aqueducts. These engineering marvels not only showcased Roman ingenuity but also served practical purposes, from public entertainment to water supply.
2024.06.01 Introducing a competency framework for languag learning materials ...Sandy Millin
http://sandymillin.wordpress.com/iateflwebinar2024
Published classroom materials form the basis of syllabuses, drive teacher professional development, and have a potentially huge influence on learners, teachers and education systems. All teachers also create their own materials, whether a few sentences on a blackboard, a highly-structured fully-realised online course, or anything in between. Despite this, the knowledge and skills needed to create effective language learning materials are rarely part of teacher training, and are mostly learnt by trial and error.
Knowledge and skills frameworks, generally called competency frameworks, for ELT teachers, trainers and managers have existed for a few years now. However, until I created one for my MA dissertation, there wasn’t one drawing together what we need to know and do to be able to effectively produce language learning materials.
This webinar will introduce you to my framework, highlighting the key competencies I identified from my research. It will also show how anybody involved in language teaching (any language, not just English!), teacher training, managing schools or developing language learning materials can benefit from using the framework.
A Strategic Approach: GenAI in EducationPeter Windle
Artificial Intelligence (AI) technologies such as Generative AI, Image Generators and Large Language Models have had a dramatic impact on teaching, learning and assessment over the past 18 months. The most immediate threat AI posed was to Academic Integrity with Higher Education Institutes (HEIs) focusing their efforts on combating the use of GenAI in assessment. Guidelines were developed for staff and students, policies put in place too. Innovative educators have forged paths in the use of Generative AI for teaching, learning and assessments leading to pockets of transformation springing up across HEIs, often with little or no top-down guidance, support or direction.
This Gasta posits a strategic approach to integrating AI into HEIs to prepare staff, students and the curriculum for an evolving world and workplace. We will highlight the advantages of working with these technologies beyond the realm of teaching, learning and assessment by considering prompt engineering skills, industry impact, curriculum changes, and the need for staff upskilling. In contrast, not engaging strategically with Generative AI poses risks, including falling behind peers, missed opportunities and failing to ensure our graduates remain employable. The rapid evolution of AI technologies necessitates a proactive and strategic approach if we are to remain relevant.
1. DMA Versus
Polling or Interrupt Driven I/O
• Polling and Interrupt driven I/O concentrates on data
transfer between the processor and I/O devices.
• An instruction to transfer (mov datain,R0) only occurs
after the processor determines that the I/O device is
ready
– Either by polling a status flag in the device interface or
– Waits for the device to send an interrupt request.
• Considerable overhead is incurred, because several
program instructions must be executed for each data
word transferred.
• Instructions are needed to increment memory address
and keeping track of work count.
• With interrupts, additional overhead associated with
saving and restoring the program counter and other state
information.
2. Direct Memory Access (DMA)
• To transfer large blocks of data at high
speed, an alternative approach is used.
• Blocks of data are transferred between an
external device and the main memory,
without continuous intervention by the
processor.
3. DMA Controller
• DMA controller is part of the I/O interface.
• Performs the functions that would normally
be carried out by the processor when
access main memory. For each word
transferred, it provides the memory
address and all the bus signals that control
data transfer.
4. DMA Controller
• Although DMAC can transfer data without
intervention by the processor, it’s operation must
be under the control of a program executed by
the processor.
• To initiate the transfer of a block of data, the
processor sends the starting address, the
number of words in the block, and direction of
the transfer. Once information is received, the
DMAC proceeds to perform the requested
operation. When the entire block has been
transferred, the controller informs the processor
by raising an interrupt signal.
5. Processor Main Memory
Disk
Printer Keyboard
DMA
Controller
Disk
Use of DMA Controllers in a Computer
System
Network
Interface
Disk/DMA
Controller
6. How is OS involved
• I/O operations are always performed by the OS in
response to a request from an application program.
• OS is also responsible for suspending the execution of
one program and starting another.
– OS puts the program that requested the transfer in the Blocked
state,
– initiates the DMA operation,
– starts execution of another program.
• When the transfer is complete, the DMA controller
informs the processor by sending an interrupt request.
– OS puts suspended program in the Runnable state so that it can
be selected by the scheduler to continue execution.
7. Registers in a DMA Interface
Status and Control
Starting Address
Word Count
31 30 1 0
IRQ
IE
Done
R / W’
8. Cycle Stealing
• Requests by DMA devices for using the bus are alwas
given higher priority than processor requests.
• Among different DMA devices, top priority is given to
high-speed peripherals (disks, high-speed network
interface, graphics display device)
• Since the processor originates most memory access
cycles, it is often stated that DMA steals memory cycles
from the processor (cycle stealing).
• If DMA controller is given exclusive access to the main
memory to transfer a block of data without interruption,
this is called block or burst mode..
9. Buffers and Arbitration
• Most DMACs have a data storage buffer –
network interfaces receive data from main
memory at bus speed, send data onto
network at network speed.
• Bus Arbitration is needed to resolve
conflicts with more than one device (2
DMACs or DMA and processor, etc..) try
to use the bus to access main memory.
10. Bus Arbitration
• Bus Master – the device that is allowed to
initiate bus transfers on the bus at any
given time. When the current master
relinquishes control, another device can
acquire this status.
• Bus Arbitration – the process by which the
next device to become bus master is
selected and bus mastership is transferred
to it.
11. Arbitration Approaches
• Centralized – a single arbiter performs the
arbitration.
• Distributed – all devices participate in the
selection of the next bus master.
12. Centralized Arbitration
• Bus arbiter may be processor or a
separate unit connected to the bus.
Processor
DMA
Controller
1
DMA
Controller
2BG1 BG2
BR
BBSY
13. Distributed Arbitration
• No central arbiter used
• Each device on bus is assigned a 4-bit
identification number.
• When one or more devices request the bus, they
assert the Start-Arbitration signal and place their
4-bit ID number on ARB[3..0].
• The request that has the highest ID number
ends up having the highest priority.
• Advantages – offers higher reliability (operation
of the bus is not dependent on any one device).
• SCSI bus is an example of distributed
(decentralized) arbitration.