18 Questions
Which type of flip-flop captures the value of the D-input at a specific point in the clock cycle?
D flip-flop
What is the primary function of a D flip-flop?
To act as a memory cell
Which type of flip-flop is used to set or reset the output based on specific inputs?
SR flip-flop
What is the primary difference between a buffer and a latch?
A buffer always follows its input, while a latch can hold data
What is the primary difference between a latch and a flip-flop?
A flip-flop can hold data, while a latch cannot
What is the purpose of using latches and buffers in input and output interfacing devices?
Both A and C
What is the primary function of a flip-flop?
To store a single bit of data
Which type of flip-flop is commonly used for synchronous designs?
D flip-flop
In an SR flip-flop, what is the output when both S and R inputs are high?
The output is indeterminate
What is the purpose of the clock signal in a D flip-flop?
To control the flow of data into the flip-flop
Which type of flip-flop is considered the most versatile and can be configured to function as various other flip-flops?
JK flip-flop
What is the advantage of using synchronous flip-flops over asynchronous ones in digital design?
Predictable behavior and easier timing analysis
What is the purpose of a tri-state buffer in a bus system?
To prevent data corruption by ensuring only one device can write at a time
What is the function of a D-flip flop in output interfacing?
To temporarily store and synchronize data from the data bus
What is the main characteristic of a flip-flop?
It can have two stable states, representing 0 and 1
What type of flip-flop is specifically mentioned in the text as being used for output interfacing?
D flip-flop
How many control bits (c0, c1, c2) can be active (1) at the same time without causing a bus conflict?
At most one of them
What is the output state of a tri-state buffer when its control bit is not active?
High-impedance (Z)
Study Notes
Types of Flip-Flops
- SR ("set-reset"), D ("data" or "delay"), T ("toggle"), and JK types are common types of flip-flops.
D Flip-Flop
- Captures the value of the D-input at a definite portion of the clock cycle (such as the rising edge of the clock).
- The captured value becomes the Q output.
- At other times, the output Q does not change.
- Can be viewed as a memory cell.
Latches and Buffers
- Latches (e.g. 74LS374) latch and hold data for input to the controller and output to external devices.
- Latches protect the controller from short circuits that might occur in external devices.
- Buffers (e.g. 74LS244, 74LS245) are used in interfacing circuitry to input and output data from CPU and external devices.
Tri-State Buffers
- Allow control over when an output signal makes it to the bus.
- When the control bit is active, the input of the device makes it to the output.
- When the control bit is inactive, the output of the device is high-impedance or nothing.
Input and Output Interfacing
- Output interfacing: used to output data from the data bus to external devices connected to the controlling system.
- Input interfacing: sources of binary information (0, 1) are usually the output of logic gates or other circuits such as switches.
Flip-Flops and Digital Electronics
- Flip-flops are a fundamental building block of digital electronics systems used in computers, communications, and many other types of systems.
- Flip-flops and latches are used as data storage elements, storing a single bit (binary digit) of data.
Inverters and Buffers
- An inverter is a NOT gate, represented by a triangle followed by a circle/bubble (negation).
- A buffer is a device whose output will always follow its input.
Test your knowledge on flip-flops and their common types such as SR, D, T, and JK. Understand how flip-flops capture input values and produce output based on the current state.
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