ModuleWare Reference Guide - Hornad

IntroductionEnable/Load BehaviorFunctionclk_en_type = ActiveHighclk_en_type = ActiveLowhigh level enable, positive polaritylow level enable, negative polarity ( )Notes• The default value for the parameter clk_en_type is ActiveHigh.• Leave the port clk_en unconnected if not used and do not change the value of the parameterclk_en_type.• The clk_en port is always on the bottom of the symbol.Enable/Load BehaviorAll the Register parts have an enable or load port enable or load which is used as a controlinput.The behavior of the enable or load port is controlled by parameters enable_type or load_typewhich are enumerated with values AsyncActiveHigh, SyncActiveHigh, AsyncActiveLow,SyncActiveLow and None.The polarity indication ( or no or hidden) for the enable or load port is dynamically set bythe enable_type or load_type parameter. If the value is set to AsyncActiveLow orSyncActiveLow, an inverted signal indicator appears on the port. If the value is set toAsyncActiveHigh or SyncActiveHigh, the indicator disappears. If the value is set to None, theport is hidden and is not visible in the symbol.You are advised not to edit the value of the enable_type or load_type parameter if enable orload is not connected because this can modify the default operation.The enable or load port polarity is implemented in the generated HDL code.Functionenable_type/load_type = AsyncActiveHighenable_type/load_type = SyncActiveHighenable_type /load_type = AsyncActiveLowenable_type / load_type = SyncActiveLowasynchronous, positive polarity.synchronous, positive polarityasynchronous, negative polarity ( )synchronous, negative polarity ( )Notes• The default value for the parameters enable_type and load_type is AsyncActiveHigh.• Leave the port enable/load unconnected or set enable_type/load_type to None if not used.26ModuleWare Reference Manual, Library Version 1.9September 18, 2008