JK Latch and Flip Flop
Overview
Despite not used in SunVox due to its questionable behavior, let's see how other solve the problem in SR latch by building a JK flip flop.
JK Flip Flop
To overcome with the invalid state, an electrical engineer named Jack Kilby invented a universal Flip Flop.1 Based on his own name, this flip flop solves the wasted invalid state, replacing with a toggle function as shown:
| IN J | IN K | OUT | OUT Inverted |
|---|---|---|---|
| 0 | 0 | retains prev state | retains prev state |
| 0 | 1 | 0 | 1 |
| 1 | 0 | 1 | 0 |
| 1 | 1 | toggle | toggle |
This is a step forward to a better flip flop since the additional toggle function is useful for switching a device using a momentary switch, or used for building counter; despite its flexibility, this flip flop doesn't made into SunVox, as there are some inconsistent behavior for this device.
- Racing condition
How this flip flop works during the toggle state is that the flip flop intends to oscillate in a high speed, but the clock limits the oscillation, acting like it is toggling ON and Off. There is workaround, but I never use this flip flop in practice because there are two more simpler and more practical alternatives for any applications in SunVox, and I will tell you about that soon.