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KembaraXtra-Computer Science-Sequential Logic Circuits and Memory
1. What are Sequential Logic Circuits?
1. What are Sequential Logic Circuits?
- Definition: Digital circuits where the output depends on:
- The present inputs.
- The past inputs (history/state of the circuit).
- Key Feature: Possess "memory" of past events.
- Purpose: Stores a record of the circuit's past state.
- Function: Allows for the storage and retrieval of binary data.
- Importance: Enables sequential logic.
- Inputs: Coin slot, vend button.
- Behavior: The vend button only works if a coin has already been inserted.
- Why it's Sequential:
- The machine "remembers" (stores in memory) whether a coin has been inserted.
- The output (dispensing an item) depends on both:
- The present input (vend button press).
- The past input (coin insertion).
- Contrast with Combinational Logic: A combinational logic vending machine would require simultaneous coin insertion and button press.
- What Memory Stores: Binary data (bits).
- Units of Measurement:
- Bits: Basic unit of memory (0 or 1).
- Bytes: Groups of 8 bits.
- Modern Devices: Have large memory capacities (e.g., 1 GB = over 8 billion bits).
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