Give a circuit memory

Hold one bit, sample data, count events, then store a whole pattern. 7 circuits, each one running in the simulator with a prediction to make before you run it.

The steps

1. RS latch
   Remember which of two requests happened last.
   Concepts: Memory, Feedback, Set and reset
2. Locked repeater latch
   Hold a sampled logic level with a lock input.
   Concepts: Level-sensitive storage, Enable, Hold
3. Copper bulb toggle
   Turn repeated events into alternating remembered states.
   Concepts: Toggle, Rising edge, One-bit state
4. Edge-triggered D flip-flop
   Sample data on a selected clock event.
   Concepts: Sampling, Clock edge, One-bit storage
5. Two-bit ripple counter
   Use state to count accepted events.
   Concepts: Counting, State transitions, Capacity
6. Analog peak memory
   Remember the largest signal level seen since clearing.
   Concepts: Peak detection, Multilevel state, Clear
7. Four-bit holding register
   Store a four-bit word with a shared control.
   Concepts: Register, Binary word, Shared control

What you will be able to do

• Remember which of two requests happened last.
• Hold a sampled logic level with a lock input.
• Turn repeated events into alternating remembered states.
• Sample data on a selected clock event.
• Use state to count accepted events.
• Remember the largest signal level seen since clearing.
• Store a four-bit word with a shared control.

Other paths