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| + | == D-latch == | ||
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A d-latch is a circuit that stores the last value seen at its "data" input while its "enable" input was on. | 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 | |
| − | {| | ||
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| − | |0|| | + | |0||x||y||y |
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| − | |1|| | + | |1||x||y||x |
|} | |} | ||
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| + | In theory, a single [[Kit_(Logic_Processor)#Logic_Select_Unit|Logic Select Unit]] can do this (selector input = enable, input 1 = output, input 2 = data, 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 === | === Connectors === | ||
| − | * | + | * Enabled: if 1, store ''data'', else do nothing. |
| − | * | + | * Data: input |
| − | * | + | * Output: stored value |
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| − | == | + | === Using Logic Select Unit and Logic Reader === |
[[File:D-latch.png|thumb|D-latch using select unit and reader]] | [[File:D-latch.png|thumb|D-latch using select unit and reader]] | ||
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<ol> | <ol> | ||
| − | <li>a | + | <li>a select unit determines whether to store the last output or the "data" input using the "enabled" input. i.e. |
| − | <pre> if | + | <pre> if enabled |
then store = data | then store = data | ||
else store = output</pre></li> | else store = output</pre></li> | ||
| − | <li>a [[Kit_(Logic_I/O)#Logic_Reader| | + | <li>a [[Kit_(Logic_I/O)#Logic_Reader|logic reader]] mirrors the value to be stored and feeds it 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. |
<pre> output = store</pre></li> | <pre> output = store</pre></li> | ||
</ol> | </ol> | ||
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! Unit name || Unit type || Connector / Setting || Source / Value | ! Unit name || Unit type || Connector / Setting || Source / Value | ||
|- | |- | ||
| − | | select 1 || Logic Select Unit || select || ''' | + | | select 1 || Logic Select Unit || select || '''enabled''' (input) |
|- | |- | ||
| || || 0 (input 1) || reader 1 | | || || 0 (input 1) || reader 1 | ||