Dma controller-microprocessor, Assembly Language

Assignment Help:

DMA controller :

 

814_dma controller.jpg

 

Steps include in transferring a block of data from I/O devices (for example a disk) to memory:

1. CPU sends a signal to initiate disk transfer through I/O interface

2. CPU sends starting address of the block

3. Disk driver reads starting address, and then reads one block of data and puts it in its own buffer

4. Disk driver sends interrupt signal to the CUP

5. CPU reads the datum into its registers (accumulator)

6. CPU examine if there is more to transfer, if answer is yes, the CPU signals the disk driver to do so meanwhile

7. CPU transfer the datum from registers to memory and increments its pointer to memory

8. DMA controller takes care of the last few steps (from signalling disk to transfer) .

 

 


Related Discussions:- Dma controller-microprocessor

A/D conversions, A/D conversion: Basic tasks: (a) Write a program that wil...

A/D conversion: Basic tasks: (a) Write a program that will read and display the analog voltage on pin PE7 approximately once every second. (b) Write a program that will read and d

Pointer(ptr)-assemblers directive-microprocessor, PTR : Pointer:- The p...

PTR : Pointer:- The pointer operator which is used to declare the type of a variable, label or memory operand. The operator PTR is prefixed by either WORD or BYTE. If the prefi

Assignment, Write an assembly program that adds the elements in the odd ind...

Write an assembly program that adds the elements in the odd indices of the following array. Use LOOP. What is the final value in the register?

Al registre, check the al-register for palindromic number

check the al-register for palindromic number

Shr-sar-logical instruction-microprocessor, SHR : Shift Logical Right: Thi...

SHR : Shift Logical Right: This instruction performs bit-wise right shifts on the operand word or byte that might be reside in  a memory location or a register, by the specified c

Embeded programming, i want to develop traffic light system so which kind o...

i want to develop traffic light system so which kind of software is needed to develop this project?

Any project ideas plz, can any one help me in my project by using assembly ...

can any one help me in my project by using assembly language

Lab Assignment, 1) Write an 80x86 assembly language program in EXE file for...

1) Write an 80x86 assembly language program in EXE file format to do the following tasks: a) Open and read the contents of a file into memory (use at least 1 kB). b) Sort the li

8086, Ask(2) Write a program to mask bits D3D2D1D0 and to set bits D5D4 and...

Ask(2) Write a program to mask bits D3D2D1D0 and to set bits D5D4 and to invert bits D7D6 of the AX register question #Minimum 100 words accepted#

Write an assembly language program, Your assignment for this project is to ...

Your assignment for this project is to write an assembly language program that checks if the user's input is a valid ISBN number. A sample run of your program might look like:

Write Your Message!

Captcha
Free Assignment Quote

Assured A++ Grade

Get guaranteed satisfaction & time on delivery in every assignment order you paid with us! We ensure premium quality solution document along with free turntin report!

All rights reserved! Copyrights ©2019-2020 ExpertsMind IT Educational Pvt Ltd