Carsten Milkau/D-Latch
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< User:Carsten MilkauRevision as of 13:49, 17 July 2018 by Carsten Milkau (talk | contribs) (Created page with "== D-latch == A d-latch is a circuit that stores the last value seen at its "data" input while its "enable" input was on. {| |enabled||data||previous output||output |- |0||x...")
Contents
D-latch
A d-latch is a circuit that stores the last value seen at its "data" input while its "enable" input was on.
enabled | data | previous output | output |
0 | x | y | y |
1 | x | y | x |
In theory, a single select unit can do this (selector input = enable, input 1 = data, input 2 = output, output = output). In practice, this is not possible as the game does not allow it to have its own output as input. However, several constructions using two or more circuits are possible.
Connectors
- Enabled: if 1, store data, else do nothing.
- Data: input
- Output: stored value
Using Select and Reader Unit
This d-latch can store any value. It works in two steps:
Step 1 : Selection
a select unit determines whether to output the "stored value" or the "data" input using the "enabled" input. i.e.
if enabled then output = stored else output = data</code>
Step 2: Feedback
a reader unit feeds the output value back into the select unit so it can circulate (effectively being stored). This would be obsolete if the select unit could read its own output.
stored = output