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Thomas Quinot 3 weeks ago
parent c28ea78c05
commit 75adaf2def

@ -68,12 +68,12 @@ System worked on first try except for LOAD mode flip-flop.
The 4027 from AliExpress behaves in a weird way, as though J and K were reversed.
The expectation is:
* ~DMA-IN is cabled to ~Q (i.e. the active low DMA IN signal is inactive when Q=0 ~Q=1)
* at startup Q=0 ~Q=1
* upon a raising edge of CLOCK, the flip flop transitions to Q=1 / ~Q=0 / DMA IN is active
* upon a positive signal on RESET, the flip flop transitions to Q=0 / ~Q=1 / DMA IN is inactive
* ~DMA-IN~ is cabled to ~Q~ (i.e. the active low DMA IN signal is inactive when Q=0 ~Q~=1)
* at startup Q=0 ~Q~=1
* upon a raising edge of CLOCK, the flip flop transitions to Q=1 / ~Q~=0 / DMA IN is active
* upon a positive signal on RESET, the flip flop transitions to Q=0 / ~Q~=1 / DMA IN is inactive
According to both the truth table and the circuit design, this is the behaviour that should be observed with J=1 K=0.
In practice this is the behaviour observed with J=0 K=1.
If I set J=1 K=0 and set Q=1 by presenting a positive signal on SET, then on a raising edge of CLOCK I see the flip flop going to Q=0 ~Q=1.
If I set J=1 K=0 and set Q=1 by presenting a positive signal on SET, then on a raising edge of CLOCK I see the flip flop going to Q=0 ~Q~=1.
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