HDL & CAD

Question 1

what is CAD

Answer 1

Computer Aided Design - refers to the process of design and testing of systems using computers
- automation of D & T process
- conforms to a specification
- reuse of common components
- simualtions

Question 2

what is HDL

Answer 2

hardware design language - used to specify the internal wiring of a chip
- can then be tested against a range of tests to ensure compliance to a specification
- can be simulated

Question 3

how are chips defined

Answer 3

a HDL defintion defines the internal wiring of a chip and consists of 2 parts:
1. HEADER - defines the interface of the chip
2. PARTS - defining the names and internal topology

Question 4

how to define a chip in HDL

Answer 4

1. each chip is defined in sperate txt files
2. file name must be the same as the chip name - CHIP xxx -> xxx.hdl
3. identifier name may be a sequence of letters & digits (cannot start with a digit & no underscores)
4. whitespace has no meaning
5. comments - //
6. lines end with semicolons

Question 5

how are buses represented in hdl

Answer 5

similar to indexes
- And (a = a[0], b=[1], out = and01);