:PROPERTIES: :ID: ddd7853a-3ffa-469e-bb2b-799189379141 :mtime: 20231016032108 :ctime: 20231016032038 :END: #+title: synchronous circuit #+filetags: :public:project: * Definition A synchronous circuit only changes with the [[id:124ef912-c3fd-4fbf-98df-fc0677c8f534][clock]] cycle. Viruitally all [[id:4480e585-82a5-4554-b503-dc9d8e201674][sequential]] circuits are synchronous. * Synchronous circuits with asynchronous inputs It is common for synchronous circutis to have some asynchronous inputs. For eaxmple: - reset/clear: force $Q$ to 0 - preset/set: force $Q$ to 1 The reason this is useful is that it can force a synchronous circuit into the correct state at startup