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ram rom selector

ram rom selector
These are example circuits targeted to 8-bits homebrew computers. They are simple circuits to select between ROM and RAM memories when they share partial block of address space, i.e. if you have a big ROM chip, let's say 32K but you won't use it every single cell of it. So you can set a ROM and a RAM chip on the same address space and set your computer to select the proper one.
Let me explain. Let's say that you have 1x 32K ROM chip and 2x 32K RAM chips and you're using a Z80. The Z80 needs ROM on the first page of the address space because at reset it points to $0000 address cell. But your firmware only occupies 16/18 KB of space. So you can build this RAM/ROM selector using simple chips from the 74xx series and let the computer switches between the 2 kinds of memory. In the first one, for example, the CPU reads from ROM chip up to address $4FFF (20,479), then reads/writes from/RAM. In the second one, the CPU addresses the ROM for the first 24K of memory then switches to RAM

project.name
1 Stars     216 Views

Digital Combinational Circuits

Digital Combinational Circuits

Digital Combinational Circuits

Gates: NOT,  AND, OR, NAND, NOR, XOR, XNOR

half adder, full adder, multiplexer, demultiplexer



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logic gates 1

logic gates 1

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dld lab 3

dld lab 3

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0 Stars     99 Views
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fuller adder

fuller adder

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0 Stars     121 Views

LOGIC GATES

LOGIC GATES

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laws of logic gates

laws of logic gates

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1 Stars     167 Views
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All Gates

All Gates

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0 Stars     137 Views

dlf

dlf

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exp 7

exp 7
or

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0 Stars     83 Views

OR Gate 3

OR Gate 3

More complicated setup


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0 Stars     153 Views

Complex Gate 1

Complex Gate 1

Deep Dive 1


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tamrin5 Q1

tamrin5 Q1

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0 Stars     90 Views
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tamrin5 Q2

tamrin5 Q2

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0 Stars     143 Views

Test1

Test1

Create Logic Gates and build Truth Tables


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0 Stars     149 Views

Complex Gate 2

Complex Gate 2

2.7 Complex Gates and Truth Tables


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0 Stars     107 Views

Complex Gate 3

Complex Gate 3

2.7 Complex gate with Truth Table


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0 Stars     147 Views

Complex Gate 4

Complex Gate 4

Complex Gates with Truth Tables


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0 Stars     160 Views

Complex Gate 5

Complex Gate 5

Complex Gates


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0 Stars     153 Views

test001

test001

test001


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0 Stars     142 Views

Test002

Test002

Test 002


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truth table of all gate

truth table of all gate

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Logis gates

Logis gates

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0 Stars     133 Views

Assignment 1

Assignment 1

Assignment 1 Lab 22-01-2020


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Basic Gates

Basic Gates

Simple Combinational Circuit using AND, OR, XOR, XNOR


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g=xy' +x'z' + x'y

g=xy' +x'z' + x'y

.


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h=(x'+y')(x+y+z')

h=(x'+y')(x+y+z')

.


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project4-1

project4-1

.


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COMPORTAS LÓGICAS

COMPORTAS LÓGICAS

Comportas lógicas anD/Ou, IFSP REGISTRO


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Experiment 1:Verifying truth table for gates

Experiment 1:Verifying truth table for gates

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E - TRÊS ENTRADAS

E - TRÊS ENTRADAS

3 ENTRADAS aND 


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OU - TRÊS ENTRADAS

OU - TRÊS ENTRADAS

OoR - TRÊS END


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COMPORTAS nOT, nOR, nAND E xOR

COMPORTAS nOT, nOR, nAND E xOR

AAAAA


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Verification of basic gates

Verification of basic gates

Verified the truth table of basic gates


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0 Stars     88 Views
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trial

trial

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0 Stars     135 Views

Verification

Verification

project.name
0 Stars     131 Views

gates

gates

project.name
0 Stars     98 Views

logic gates

logic gates

project.name
0 Stars     114 Views

Study of logic gates

Study of logic gates

project.name
0 Stars     106 Views

logic gates

logic gates

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0 Stars     71 Views
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GATES

GATES

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basic circuit diagram

basic circuit diagram

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0 Stars     79 Views
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nor

nor

nothing


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0 Stars     58 Views

1st Project

1st Project

project.name
0 Stars     47 Views

01_basic gate

01_basic gate

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0 Stars     79 Views

full adder

full adder

project.name
0 Stars     75 Views

3-bit carry look-ahead adder

3-bit carry look-ahead adder

project.name
0 Stars     104 Views

Exemplo de portas lógicas

Exemplo de portas lógicas

Exemplos do funcionamento das portas lógicas básicas.


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0 Stars     95 Views

assignment2

assignment2

project.name
0 Stars     57 Views

assignment2

assignment2

project.name
0 Stars     75 Views

assignment3

assignment3

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project.name
0 Stars     47 Views

Untitled

Untitled

project.name
0 Stars     69 Views

full wave

full wave

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full and half

full and half

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0 Stars     76 Views
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half

half

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full

full

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0 Stars     76 Views
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multiplexer

multiplexer

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0 Stars     45 Views
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DEMULTIPLEXER

DEMULTIPLEXER

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0 Stars     33 Views

full

full

project.name
0 Stars     36 Views

demultiplexef

demultiplexef

project.name
0 Stars     61 Views

myGATES

myGATES

project.name
0 Stars     62 Views

EXPERIMENT 0 Basic gates

EXPERIMENT 0 Basic gates

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0 Stars     85 Views
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logic gate

logic gate

logic gate project


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0 Stars     87 Views

study of logic gates

study of logic gates

project.name
0 Stars     75 Views

Logic gates

Logic gates

project.name
0 Stars     92 Views

homework

homework

project.name
0 Stars     33 Views

Experiment1

Experiment1

first experiment


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0 Stars     37 Views

rekha

rekha

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1 Stars     223 Views
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This is a simple digital clock with basic combinational and sequential logic circuits.

It can display seconds, minutes, and hours

Users can set time by clicking the button and using the multiplexer to choose which to change.

Also, the design for the 4bits 7segment display and 3 bits 7segment display is inside.


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gheevas project 1

gheevas project 1

project.name
0 Stars     47 Views

experiment 1 level 1

experiment 1 level 1

project.name
0 Stars     15 Views

Unlovi gatetitled

Unlovi gatetitled

project.name
0 Stars     23 Views

Logic gate

Logic gate

project.name
0 Stars     50 Views

LOGIC GATES

LOGIC GATES

project.name
0 Stars     26 Views

7 gates Implementation

7 gates Implementation

First lab of COA. 

Implementation and verification of logic gates

1.AND gate

2.OR gate

3.NOT gate

4.XOR gate

5.XNOR gate

6.NAND gate 

7.NOR gate


project.name
1 Stars     22 Views

shubham kumar

shubham kumar

project.name
0 Stars     47 Views

shubham verma

shubham verma

project.name
0 Stars     22 Views

team baka

team baka

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0 Stars     39 Views
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Untitled

Untitled

NAND gate only version for other gates


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0 Stars     11 Views

teste

teste
or

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0 Stars     13 Views

BASIC GATES

BASIC GATES

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class project

class project

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two gate using not gate also class project

two gate using not gate also class project

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class project 3

class project 3

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0 Stars     12 Views

Or gate test

Or gate test

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0 Stars     4 Views
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project1

project1

project.name
0 Stars     3 Views

11septlab

11septlab

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0 Stars     6 Views
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assignment 1

assignment 1

project.name
0 Stars     4 Views

Porta Lógica

Porta Lógica

O que são Portas Lógicas?

Portas lógicas são os blocos fundamentais da eletrônica digital, responsáveis pela realização das operações lógicas básicas que formam a base dos circuitos digitais. Elas recebem um ou mais sinais de entrada e produzem um sinal de saída, conforme uma lógica específica. As portas lógicas são essenciais em computadores, dispositivos eletrônicos e em diversas aplicações tecnológicas, pois são usadas para executar operações como soma, subtração, comparação, e outras funções lógicas necessárias para o funcionamento de sistemas digitais.

Cada porta lógica tem uma função definida e pode ser representada por um símbolo específico em diagramas elétricos. As operações realizadas por essas portas são baseadas nas leis da lógica matemática, particularmente na álgebra booleana, que permite a manipulação de variáveis binárias (0 e 1).