74174: Difference between revisions
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Function table
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Hex D flip-flop. | |||
Hex D flip-flop | |||
It used as bank register in [[ZX Spectrum 128K]] for [[memory paging]]. | |||
====Pinout==== | ====Pinout==== | ||
Line 9: | Line 8: | ||
{| | {| | ||
| style="text-align:right;" | | | style="text-align:right;" | | ||
{{overline|CLEAR}}<br> | {{overline|CLEAR}} [<br> | ||
1Q<br> | 1Q [<br> | ||
1D<br> | 1D [<br> | ||
2D<br> | 2D [<br> | ||
2Q<br> | 2Q [<br> | ||
3D<br> | 3D [<br> | ||
3Q<br> | 3Q [<br> | ||
GND | GND [ | ||
| style="border: 1px solid black" | | | style="border: 1px solid black"| | ||
1 ° 16<br> | 1 ° 16<br> | ||
2 15<br> | 2 15<br> | ||
Line 27: | Line 26: | ||
8 9 | 8 9 | ||
|| | || | ||
V<sub>CC</sub><br> | ] V<sub>CC</sub><br> | ||
6Q<br> | ] 6Q<br> | ||
6D<br> | ] 6D<br> | ||
5D<br> | ] 5D<br> | ||
5Q<br> | ] 5Q<br> | ||
4D<br> | ] 4D<br> | ||
4Q<br> | ] 4Q<br> | ||
CLK | ] CLK | ||
|} | |} | ||
</div> | </div> | ||
====Function table<br>(each flip-flop)==== | ====Function table<br>(each flip-flop)==== | ||
{|class="wikitable" | |||
!colspan="3"|Inputs||Output | |||
{|class="wikitable" | |||
!colspan=3|Inputs | |||
|- | |- | ||
!CLEAR||Clock||xD||xQ | |||
|- | |- | ||
|L||X||X||L | |L||X||X||L | ||
|- | |- | ||
|H|| | |H||↑||L||L | ||
|- | |- | ||
|H|| | |H||↑||H||H | ||
|- | |- | ||
|H|| | |H||X (not ↑)||X||xQ<sub>O</sub> | ||
|} | |} | ||
< | H = high level (steady state)<br> | ||
L = low level (steady state)<br> | |||
X = irrelevant<br> | |||
↑ = transition from low to high level<br> | |||
xQ<sub>O</sub> = the level of xQ before the indicated steady-state input conditions were established |
Latest revision as of 05:54, 7 May 2021
Hex D flip-flop.
It used as bank register in ZX Spectrum 128K for memory paging.
Pinout
CLEAR [ |
1 ° 16 |
] VCC |
Function table
(each flip-flop)
Inputs | Output | ||
---|---|---|---|
CLEAR | Clock | xD | xQ |
L | X | X | L |
H | ↑ | L | L |
H | ↑ | H | H |
H | X (not ↑) | X | xQO |
H = high level (steady state)
L = low level (steady state)
X = irrelevant
↑ = transition from low to high level
xQO = the level of xQ before the indicated steady-state input conditions were established