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D Flip Flops

Omoplata

Omoplata

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Anyone in computer science or engineering know how to explain a D Flip Flop CLK register?

Having a tough time grasping the rising edge and pulse patterns for input and output (1,0)
 
Calculating Figure It Out GIF
 
I asked Grok to explain it as simple as possible and even that caused my brain to 404

"
### What is a D Flip-Flop (with CLK)?
  • A D Flip-Flop is a simple digital "memory cell" that stores 1 bit (either 0 or 1).
  • Inputs:
- D (Data): The value you want to store (0 or 1).
- CLK (Clock): A pulsing signal (like a heartbeat) that controls when to store D.
- Output:
- Q: The stored value (what comes out; it can also have a flipped version called Q-bar, but we'll ignore that for simplicity).
- It's edge-triggered: It only acts on the rising edge of CLK (when CLK jumps from 0 to 1, like a quick "up" tick). Between edges, Q just "holds" its last value—no changes.

### Key Rule: Rising Edge Behavior
  • On rising edge of CLK: Q instantly copies D's value (Q ← D).
  • No rising edge yet: Ignore D changes; Q stays the same.
  • CLK is a square wave: Low (0) → High (1) → Low (0), repeating. Only the 0→1 jump matters.

### Simple Pulse Patterns: Input/Output Examples
Imagine time flowing left to right. CLK pulses every few units. We'll track D changes and see Q respond. (Initial Q = 0 for all.)

- Case 1: D stays 0 (no change), CLK pulses
- Time 0: D=0, CLK=0, Q=0 (holds).
- Time 1: CLK rises (0→1), Q copies D → Q=0 (still 0).
- Time 2-3: CLK low, D=0, Q=0 (holds).
- Time 4: CLK rises again, Q copies D → Q=0 (no change).
- Pattern: Q stays 0 forever if D=0. CLK pulses do nothing new.

- Case 2: D switches to 1 midway, CLK pulses
- Time 0: D=0, CLK=0, Q=0.
- Time 1: D changes to 1 (but no CLK edge yet), Q=0 (ignores D; holds).
- Time 2: CLK rises (0→1), Q copies D → Q=1 (now stores the new D!).
- Time 3-4: CLK low, D=1, Q=1 (holds, even if D later drops to 0).
- Time 5: CLK rises again, if D still 1 → Q=1 (holds). If D=0 now → Q=0.
- Pattern: Q only "sees" D right at the rising edge. It's like a snapshot.

- Case 3: D pulses quickly (0→1→0) between CLK edges
- Time 0: D=0, CLK=0, Q=0.
- Time 1: D pulses to 1 briefly, then back to 0 (no CLK edge), Q=0 (ignores the pulse).
- Time 2: CLK rises, D=0 at that exact moment → Q=0 (pulse missed!).
- Pattern: Fast D changes between edges are ignored. Q waits for CLK's "okay" (rising edge).

- Case 4: D=1 steady, multiple CLK pulses
- Time 0: D=1, CLK=0, Q=0 (initial).
- Time 1: CLK rises → Q=1 (copies).
- Time 2-3: CLK low, Q=1 (holds).
- Time 4: CLK rises again → Q=1 (still copies D=1; no change).
- Pattern: Once set to 1, Q stays 1 as long as D=1 on edges. Like latching a value.

### Quick Tips to Grasp It
  • Think of CLK rising edge as a "button press" that saves D to Q.
  • Q is "sticky"—it remembers until the next button press.
  • Draw a timeline: CLK as square waves, D as steps, Q as delayed copy of D (only at edges).
  • Common mistake: Forgetting Q ignores D until the edge. No edge = no action!"
 
BackShot said:
I asked Grok to explain it as simple as possible and even that caused my brain to 404

"
### What is a D Flip-Flop (with CLK)?
  • A D Flip-Flop is a simple digital "memory cell" that stores 1 bit (either 0 or 1).
  • Inputs:
- D (Data): The value you want to store (0 or 1).
- CLK (Clock): A pulsing signal (like a heartbeat) that controls when to store D.
- Output:
- Q: The stored value (what comes out; it can also have a flipped version called Q-bar, but we'll ignore that for simplicity).
- It's edge-triggered: It only acts on the rising edge of CLK (when CLK jumps from 0 to 1, like a quick "up" tick). Between edges, Q just "holds" its last value—no changes.

### Key Rule: Rising Edge Behavior
  • On rising edge of CLK: Q instantly copies D's value (Q ← D).
  • No rising edge yet: Ignore D changes; Q stays the same.
  • CLK is a square wave: Low (0) → High (1) → Low (0), repeating. Only the 0→1 jump matters.

### Simple Pulse Patterns: Input/Output Examples
Imagine time flowing left to right. CLK pulses every few units. We'll track D changes and see Q respond. (Initial Q = 0 for all.)

- Case 1: D stays 0 (no change), CLK pulses
- Time 0: D=0, CLK=0, Q=0 (holds).
- Time 1: CLK rises (0→1), Q copies D → Q=0 (still 0).
- Time 2-3: CLK low, D=0, Q=0 (holds).
- Time 4: CLK rises again, Q copies D → Q=0 (no change).
- Pattern: Q stays 0 forever if D=0. CLK pulses do nothing new.

- Case 2: D switches to 1 midway, CLK pulses
- Time 0: D=0, CLK=0, Q=0.
- Time 1: D changes to 1 (but no CLK edge yet), Q=0 (ignores D; holds).
- Time 2: CLK rises (0→1), Q copies D → Q=1 (now stores the new D!).
- Time 3-4: CLK low, D=1, Q=1 (holds, even if D later drops to 0).
- Time 5: CLK rises again, if D still 1 → Q=1 (holds). If D=0 now → Q=0.
- Pattern: Q only "sees" D right at the rising edge. It's like a snapshot.

- Case 3: D pulses quickly (0→1→0) between CLK edges
- Time 0: D=0, CLK=0, Q=0.
- Time 1: D pulses to 1 briefly, then back to 0 (no CLK edge), Q=0 (ignores the pulse).
- Time 2: CLK rises, D=0 at that exact moment → Q=0 (pulse missed!).
- Pattern: Fast D changes between edges are ignored. Q waits for CLK's "okay" (rising edge).

- Case 4: D=1 steady, multiple CLK pulses
- Time 0: D=1, CLK=0, Q=0 (initial).
- Time 1: CLK rises → Q=1 (copies).
- Time 2-3: CLK low, Q=1 (holds).
- Time 4: CLK rises again → Q=1 (still copies D=1; no change).
- Pattern: Once set to 1, Q stays 1 as long as D=1 on edges. Like latching a value.

### Quick Tips to Grasp It
  • Think of CLK rising edge as a "button press" that saves D to Q.
  • Q is "sticky"—it remembers until the next button press.
  • Draw a timeline: CLK as square waves, D as steps, Q as delayed copy of D (only at edges).
  • Common mistake: Forgetting Q ignores D until the edge. No edge = no action!"
Click to expand...
AI isn’t enough, trust me. AI overexplains it.. complicates. There’s a pattern / and way to grasp it.

My teacher is genius, but he explains it on his level (genius).
 
Maybe this will help, I told it to use animals and explain it in layman's terms :ROFLMAO:
having zero experience in this, It helped me marginally understand whats going on.

### What's a D Flip-Flop? (Super Simple Version)
  • It's like a tiny animal kennel that holds one pet at a time (a Cat or a Dog).
  • What goes in:
- D (the pet you want to put in): Pick Cat or Dog.
- CLK (the doorbell): It rings in pulses to say "Hey, time to swap pets!"
- What comes out:
- Q (the pet in the kennel): That's your stored pet. It stays put until told otherwise.
- The kennel only listens when the doorbell goes from silent to ringing (the "up" tick). Otherwise, it ignores any pets you try to add.

### The Big Rule: Doorbell "Up" Tick
  • When the doorbell ticks up (silent → ringing): The kennel grabs whatever pet is at the door (D) and locks it in (Q gets that pet).
  • Before that tick: Ignore the door. Kennel keeps its current pet cozy.
  • Doorbell is like a repeating buzzer: Off, on, off... Only the off-to-on moment counts.

### Everyday Pet Swap Stories
Picture time ticking by. Doorbell buzzes now and then. Kennel starts with a Cat inside.

- Story 1: Same old Cat at the door, doorbell buzzes
- Start: Cat at door, doorbell silent, kennel has Cat.
- Buzz up! Kennel swaps → still Cat (no big deal).
- Buzz again later → still Cat.
- Moral: If nothing changes at the door, kennel stays boring.

- Story 2: Surprise Dog shows up, then doorbell buzzes
- Start: Cat at door, silent, kennel has Cat.
- Dog arrives at door (but no buzz yet) → kennel yawns, keeps Cat.
- Buzz up! Kennel peeks → grabs Dog and locks it in.
- Even if Cat sneaks back to the door later → kennel ignores, Dog stays.
- Next buzz: If Dog's still there → keeps Dog. If Cat's back → swaps to Cat.
- Moral: Kennel only checks the door exactly when the buzz hits. Like a snapshot photo.

- Story 3: Quick Dog visit between buzzes
- Start: Cat at door, silent, kennel has Cat.
- Dog dashes to door and away (no buzz) → kennel doesn't notice, keeps Cat.
- Buzz up! Only Cat's there → kennel stays Cat (Dog visit? What Dog?).
- Moral: Sneaky fast changes get missed. Kennel waits for the buzz invite.

- Story 4: Dog sticks around for buzzes
- Start: Dog at door, silent, kennel has Cat.
- Buzz up! → swaps to Dog.
- Between buzzes: Dog stays, even if door empties.
- Next buzz → if Dog's there, keeps it. Like gluing the pet in place.
- Moral: Once in, the pet chills until the next buzz says "change."

### Easy Tricks to Remember
  • Doorbell up-tick = "Save this pet!" button.
  • Kennel is lazy and sticky—ignores door until buzz, then holds tight.
  • Sketch it: Doorbell as bouncy waves, door pets as swaps, kennel as copycat (but delayed to buzzes).
  • Trap to dodge: No buzz? No swap. Door pets don't auto-enter!
 
BackShot said:
Maybe this will help, I told it to use animals and explain it in layman's terms :ROFLMAO:
having zero experience in this, It helped me marginally understand whats going on.

### What's a D Flip-Flop? (Super Simple Version)
  • It's like a tiny animal kennel that holds one pet at a time (a Cat or a Dog).
  • What goes in:
- D (the pet you want to put in): Pick Cat or Dog.
- CLK (the doorbell): It rings in pulses to say "Hey, time to swap pets!"
- What comes out:
- Q (the pet in the kennel): That's your stored pet. It stays put until told otherwise.
- The kennel only listens when the doorbell goes from silent to ringing (the "up" tick). Otherwise, it ignores any pets you try to add.

### The Big Rule: Doorbell "Up" Tick
  • When the doorbell ticks up (silent → ringing): The kennel grabs whatever pet is at the door (D) and locks it in (Q gets that pet).
  • Before that tick: Ignore the door. Kennel keeps its current pet cozy.
  • Doorbell is like a repeating buzzer: Off, on, off... Only the off-to-on moment counts.

### Everyday Pet Swap Stories
Picture time ticking by. Doorbell buzzes now and then. Kennel starts with a Cat inside.

- Story 1: Same old Cat at the door, doorbell buzzes
- Start: Cat at door, doorbell silent, kennel has Cat.
- Buzz up! Kennel swaps → still Cat (no big deal).
- Buzz again later → still Cat.
- Moral: If nothing changes at the door, kennel stays boring.

- Story 2: Surprise Dog shows up, then doorbell buzzes
- Start: Cat at door, silent, kennel has Cat.
- Dog arrives at door (but no buzz yet) → kennel yawns, keeps Cat.
- Buzz up! Kennel peeks → grabs Dog and locks it in.
- Even if Cat sneaks back to the door later → kennel ignores, Dog stays.
- Next buzz: If Dog's still there → keeps Dog. If Cat's back → swaps to Cat.
- Moral: Kennel only checks the door exactly when the buzz hits. Like a snapshot photo.

- Story 3: Quick Dog visit between buzzes
- Start: Cat at door, silent, kennel has Cat.
- Dog dashes to door and away (no buzz) → kennel doesn't notice, keeps Cat.
- Buzz up! Only Cat's there → kennel stays Cat (Dog visit? What Dog?).
- Moral: Sneaky fast changes get missed. Kennel waits for the buzz invite.

- Story 4: Dog sticks around for buzzes
- Start: Dog at door, silent, kennel has Cat.
- Buzz up! → swaps to Dog.
- Between buzzes: Dog stays, even if door empties.
- Next buzz → if Dog's there, keeps it. Like gluing the pet in place.
- Moral: Once in, the pet chills until the next buzz says "change."

### Easy Tricks to Remember
  • Doorbell up-tick = "Save this pet!" button.
  • Kennel is lazy and sticky—ignores door until buzz, then holds tight.
  • Sketch it: Doorbell as bouncy waves, door pets as swaps, kennel as copycat (but delayed to buzzes).
  • Trap to dodge: No buzz? No swap. Door pets don't auto-enter!
Click to expand...
Actually it did help. The chart to make it is the complex part. College is fun until it makes OCD kick in lol
 
Valdosta said:
got my degree without ever hearing of this. hasnt came up at work at all either luckily
Click to expand...
it likely will never come up unless youre doing something extremely niche with a circuit board, and I mean EXTREMELY niche.
and if youre trying to debug a d flip flop itd probably be cheaper and less time consuming to just get a whole new chip lol
 
is it PCB logic, I work on planes that have logic cards we call them gates so the logic circuit is looking for and, or, nor, either or both inputs to complete the circuit, that circuit is sending a signal to a symbol generator that turns the hexadecimal code into words on the screen for the crew to know status or configuration.
If your engines are off 1 of the messages you may get is "oil pressure low" thats the circuit looking for a completed circuit when the oil pressure switch is made which is basically a ground but is called a discreet on a PCB
 
The whole damn thing sounds sexual. "D flip flops" until it's "edge triggered" then it's a "rising edge". When it starts "pulsing" you better have a kleenex.
 
Here's another example...

Pretend you're in a classroom, and the teacher is giving instructions.

  • You are the D flip-flop.
  • The teacher’s words are the data (D).
  • The school bell is the clock (CLK).
  • Your notebook is the output (Q).
  • The teacher (data) tells you something during class — like “write down the number 5.”
  • You don’t write it down right away.
  • You wait for the bell to ring (that’s the clock signal).
  • Only when the bell rings, you write down what the teacher just said in your notebook.
  • After that, even if the teacher says something new, you don’t change your notebook until the next bell rings.
It helps everyone in class write things down at the same time, only when the bell rings. That way, things stay organized and synchronized.

A D flip-flop is like a student who only writes down what the teacher says when the bell rings. Until then, they just listen. After the bell, they remember exactly what the teacher said at that moment.
 
Big_Jimmy434 said:
Here's another example...

Pretend you're in a classroom, and the teacher is giving instructions.

  • You are the D flip-flop.
  • The teacher’s words are the data (D).
  • The school bell is the clock (CLK).
  • Your notebook is the output (Q).
  • The teacher (data) tells you something during class — like “write down the number 5.”
  • You don’t write it down right away.
  • You wait for the bell to ring (that’s the clock signal).
  • Only when the bell rings, you write down what the teacher just said in your notebook.
  • After that, even if the teacher says something new, you don’t change your notebook until the next bell rings.
It helps everyone in class write things down at the same time, only when the bell rings. That way, things stay organized and synchronized.

A D flip-flop is like a student who only writes down what the teacher says when the bell rings. Until then, they just listen. After the bell, they remember exactly what the teacher said at that moment.
Click to expand...
Good example actually

@Valdosta @dcdogz

Not surprised you don’t even use this at work… This material is mind consuming. Need to study more.
 

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