Memory Address Decoding

Binary Decoders - Decoders have 2n-inputs and n outputs, each input combination results in a single output line contain a 1, and all other lines contain a 0 on the output. Examples of use are decoding memory addresses and CPU instructions.Typically Decoders have an enable when 1 enables decoding the input to 1 on a single output, when not enabled all outputs are zero. The switching function for an enabled 2-input binary decoder is:

The 2 to 4 decoder representation is:

Memory Address Decoding - Figure indicate a 16K by 1 bit word memory (8 bit words are implemented by selecting 8 bits as a group, for instance). Since 214 is about 16K, a single decoder would require 14 inputs and 214 output

The memory decoder is linked to the CPU by the address bus. Each memory cell is linked to an output and input data bus, a write/read control, and the decoder which enables the memory cell when the suitable address appears. The decoder ensures that just a single memory cell is activated at a time for either output or input.

Posted Date: 10/10/2012 5:47:34 AM | Location : United States

Ask an Expert

Related Discussions:- Memory address decoding-microprocessor, Assignment Help, Ask Question on Memory address decoding-microprocessor, Get Answer, Expert's Help, Memory address decoding-microprocessor Discussions

Write discussion on Memory address decoding-microprocessor
Your posts are moderated

Write your message here..

Related Questions

Write a assembly language subroutine, Write a M68000 assembly language subr... Write a M68000 assembly language subroutine MULSUM that takes an array named A containing n bytes of positive numbers, and fills two arrays, array B containing n

Read architecture:look aside cache-microprocessor, Read Architecture : Look... Read Architecture : Look Aside Cache In "look aside" cache architecture the main memory is located conflictingthe system interface. Both the cache main memory sees a bus cycle

Program to evaluate equation, Write a program to evaluate the following exp... Write a program to evaluate the following expression. You are to evaluate the following equation: num1 - (input + num2) - (num3 + num4) Input will be a hex number input by

Encrypting, write an assembly language program that has two subroutines : o... write an assembly language program that has two subroutines : one for encrypting alphabates of a string and second fo decrypting the encoded string . in encryption simply converta

Write an assembly language program to find the maximum, Write an assembly ... Write an assembly language program to find the maximum of: y = x 6 - 14x 2 + 56x for the range -2 ≤ x ≤ 4, by stepping one by one through the range. The program should in

Assume-assemblers directive-microprocessor, ASSUME: Assume Logical Segment... ASSUME: Assume Logical Segment Name:- The ASSUME directive which is used to inform the assembler, the specified names of the logical segments to be consider for different segme

Scas-string manipulation instruction-microprocessor, SCAS : Scan String By... SCAS : Scan String Byte or String Word:- This instruction scans a string of words or byte for an operand word or byte specified in the register AL or  register AX. The string i

Interrupt system based on multiple 8259as-microprocessor, Interrupt System ... Interrupt System Based on Multiple 8259As A multiple 8259A interrupt system is diagrammed in given figure in this figure data bus drivers are not indicated, but they could be i

Label-assemblers directive-microprocessor, LABEL :   The Label directive... LABEL :   The Label directive which is used to assign a name to the current content of the location counter. At the beginning of the assembly process, the assembler start a loca

Iret-loop-unconditional branch instruction-microprocessor, IRET : Return f... IRET : Return from ISR:- When an interrupt service routine is called, before transferring control to it, the IP, CS  register and flag registers are stored in the stack to ment