| Circuits: black box | ||||||||||||||
| "Thinking outside the box." | ||||||||||||||
| Abstraction: sometimes we need to see the details of how a circuit is built | ||||||||||||||
| Other times, we only need to know what it does | ||||||||||||||
| Black box: represents only inputs and outputs | ||||||||||||||
| Example: | Conventions: | |||||||||||||
|
Data inputs are circled: x, y | |||||||||||||
| Control inputs are written in triangles | ||||||||||||||
| or trapezoids: c | ||||||||||||||
| Outputs are squared: z0, z1 | ||||||||||||||
| Hardwired 0's and 1's can be written as | ||||||||||||||
| just 0's and 1's (no shape) | ||||||||||||||