MSI components

Question 1

What are the 4 common MSI circuits?

Answer 1

1. Decoder
2. Demultiplexer
3. Encoder
4. Multiplexer

Question 2

What is a decoder?

Answer 2

Codes that represent entities can be identified with a decoder.

Converts binary information from N input lines to 2^n output lines (n:m line)
e.g. 2x4 decoder, 3x8 decoder

Question 3

What is an encoder?

Answer 3

Given a set of input lines where only exactly ONE is high and the rest are low.

Provides a code that corresponds to that high input line.

Question 4

What is a priority encoder?

Answer 4

If 2 or more inputs = 1, then the input with the highest priorit takes precedence.

If all inputs are 0, then the input combination is invalid.

Question 5

What is a demultiplxer?

Answer 5

Given an input line and selection lines, it directs data from input to one selected output line.

Similar to decoder

Question 6

What is a multiplexer?

Answer 6

Given a number of input lines and selection lines, directs one of the inputs into a single output line.

2^n:1 MUX is mad from an n:2^n decoder where the inputs going into the decoder are n selector lines. Then each output line of the decoder is added together with their respective input lines of the MUX with an AND gate.