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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.
  
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== Definition ==
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{|
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|enabled||data||previous output||output
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{| class="wikitable"
 
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|+ value table
 
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|-
 
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!colspan="3"|'''inputs'''||'''outputs'''
 
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|-
 
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!enable||data||previous output||output
 
 
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|0||''x''||''y''||''y''
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|0||x||y||y
 
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|1||''x''||''y''||''x''
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|1||x||y||x
 
|}
 
|}
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In theory, a single [[Kit_(Logic_Processor)#Logic_Select_Unit|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 ===
 
=== Connectors ===
  
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* enable: if 1, store ''data'', else do nothing.
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* Enabled: if 1, store ''data'', else do nothing.
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* data: input
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* Data: input
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* output: stored value
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* Output: stored value
  
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== Relation to Multiplexer (Logic Select Unit) ==
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=== Using Select and Reader Unit ===
  
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In theory, a single multiplexer ([[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.
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This d-latch can store any value. It works in two steps:
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== Implementation Using Logic Select Unit and Logic Reader ==
 
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[[File:D-latch.png|thumb|D-latch using select unit and reader]]
 
  
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This d-latch can store any value. It works in two steps:
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==== Step 1 : Selection ====
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a select unit determines whether to output the "stored value" or the "data" input using the "enabled" input. i.e.  
  
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<ol>
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  if enabled
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<li>a Logic Select Unit determines whether to store the last output or the "data" input using the "enable" input. i.e.
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   then output = stored
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<pre>  if enable
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   else output = data</code>
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   then store = data
 
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   else store = output</pre></li>
 
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<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.
 
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<pre>  output = store</pre></li>
 
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</ol>
 
  
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==== Step 2: Feedback ====
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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.
  
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{| class="wikitable"
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  stored = output
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|+ Circuit setup
 
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|-
 
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! Unit name || Unit type    || Connector / Setting || Source / Value
 
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|-
 
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| select 1  || Logic Select Unit  || select        || '''enable''' (input)
 
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|-
 
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|          ||              || 0 (input 1)    || reader 1
 
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|-
 
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|          ||              || 1 (input 2)    || '''data''' (input)
 
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|-
 
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| reader  1 || Logic Reader || in            || select 1
 
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|-
 
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|          ||              || var            || setting
 
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|-
 
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|          ||              || out            || '''output''' (output)
 
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|}
 

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