Final answer:
In the DFF symbolic notation, the small triangle represents the clock signal. It is a crucial component in sequential logic circuits, controlling the timing of operations.
Step-by-step explanation:
In the DFF symbolic notation, the small triangle represents the clock signal. The clock signal is a crucial component in sequential logic circuits, such as D flip-flops (DFFs), as it synchronizes the operation of the circuit.
The clock signal is often represented by a small triangle to indicate its role in controlling the timing of the circuit's operations. It ensures that the inputs are sampled and the outputs are stable at specific points in time. The clock signal regulates when the D input is latched and when the output changes.
For example, in a DFF with positive edge-triggering, the D input is captured at the rising edge of the clock signal. The output, on the other hand, changes at the falling edge of the clock signal. The small triangle symbolizes this timing relationship between the clock signal and the other signals in the circuit.