February 2010 – Reloading Process [0%]

February will be a month of changes to make the base of the rest of the year. Right now I’m configuring a calendar of study to make time for my networking studies [CCNA]. In the college I’m in partials exams, it makes a hard time of study. Soon I will be publishing notes of my studies in route to my CCNA certification.

~mφxαsm

Status Update January – 2010

Well this month i was so lazy about the course to my first goal but i don’t lose the focus of my goal. Since I’m in the university too and the subjects take a lot of my time of study. Now I need to organize my study to make space for my CCNA studies and look how I will get the money for the exam because the mother money support …. well what I can tell you? shit happens!. Thats all for now.

~mφxαsm

Digital Logic – Volume 01 – (1-4)

Given that I’m studying electronics engineering in college I decided to publish several articles about the other world that I love.

Intro

The systems and analog devices process the signals in time variations that can take on any value along a continuous range of voltage, current or other measure.A digital signal is modeled to take at any instant, only one of two discrete values, we call 0 and 1 (or LOW and HIGH, False and True). When using two discrete values, is given the name of binary values. When working with 0 and 1, these values are called bits (binary digit). When the 0 is assigned to 1 HIGH LOW and It is said to be working with positive logic.. When the 0 is assigned to 1 HIGH and LOW is negative logic.

These discrete values are used to encode information to be processed by a digital system. A calculator is an example of a digital system. Another digital system is the computer. While the calculator is a special purpose system, the computer is a general purpose system. The first computers were used primarily for numerical calculations, in this case the discrete values used are the digits. This application has arisen names digital computer, digital system. Advantages of digital circuitry on the analog circuits:

• Reproducibility of results.
• Ease of design.
• Flexibility and functionality.
• Programmability.
• Speed.
• Economy
• Constant technological advancement.

It’s called logic based on the same principles that govern human thought. But what is the logic? It is the study of methods and principles used to distinguish the good thought (correctly) a bad (incorrect). Binary logic deals with variables that take two discrete values and logical operations assume significance (conjunction, disjunction, negation). A logic gate is an electronic circuit that executes a logic function. The are three basic gates: AND, OR, NOT. There are two more that are combinations of the above: NAND and NOR. There are two other specials: XOR and XNOR.

The determinant of a gate: is a value that once present at one of its inputs determines the value of the output without having to know the present value in other posts.

Truth table: a table of all possible combinations of input variables and the corresponding value that takes the output. The number of combinations is calculated by raising 2 to the number of input variables.

AND Gate

Mathematical notation: X = AB X = AB

This is characterized in that has only 1 to its output when all inputs are 1. The determinant value of this gate is 0 since there is a 0 as the input will output 0.

This a AND gate demonstration.

OR Gate

Mathematical notation : X = A+B

The OR gate is 1 to its output when any of its inputs are 1. The determinant of the OR gate is 1: a 1 in an entry immediately determinesa 1 to the exit.

This a OR gate demonstration.

NOT Gate

Mathematical notation : X = X`

The NOT gate is a unitary operator is therefore not decisive. It is known as an investor, denial. A variant of mathematical notation is a bar over the variable and in some technical manuals manufacturers usually put a # after the variable name to show his denial.

This a NOT gate demonstration.

NAND Gate

Mathematical notation: X = A`.B` X = (AB)`

The NAND gate is the negation of the exit gate. Hence its output is 0 only when all its inputs are 1. The determinant of the NAND gate is 0: a 0 in an entry immediately determines a 1 to the exit.

This a NAND gate demonstration.

NOR Gate

Mathematical notation : X = (A+B)`

The NOR gate is the negation of the OR gate output. Hence its output is 0 when any of its inputs are 1. The determinant of the NOR gate is 1: a 1 in an entry immediately determines a 0 to the exit.

This a NOR gate demonstration.

XOR Gate

Mathematical notation : S = A ⊕ B.

The XOR gate is 1 to its output when its inputs are different. No conclusive. The XOR gate is called an odd function for the gate to generate a 1 to its output must be an odd number of 1s in its inputs. This statement is very useful in analyzing more XOR gates of two inputs.

This a XOR gate demonstration.

XNOR Gate

Mathematical notation : S = X ʘ Y.

The XNOR gate is 1 to its output when its inputs are equal. No conclusive. The XNOR gate is called for even function for the gate to generate a 1 to its output must have an even number of 1s in its inputs. This statementis very useful in analyzing XNOR gates more than two entries.

This a XNOR gate demonstration.

Mom Giving Support

Mom: So, you want to be a CCNA?

mφxαsm: Yeap!

Mom: So, study like a crazy because i will pay your exam

mφxαsm: WTF??? you will give me US$250.00 for a exam?

Mom: Yeap!

mφxαsm: Ok, (That is not a normal situation but its a great deal).

~mφxαsm

The Start

From now on this blog I will publish letters, notes, and everything that is related to networking.

My main goal is to get as many certificates as possible (Did anyone mention CCIE?), But my short term goal will be to achieve CCNA certification. That’s all for now.

~mφxαsm