ModuleWare Reference Guide - Hornad

Sequential PartsModulo Counter (modcntr)For Binary Incrementing CounterThis table is for synchronous high reset. (n is the minimum number of registers required.)Table 8-29. Modulo Counter Truth Table — Binary Incrementing Counter,Synchronous High Resetmode clk_en clk rst creg (n-1) creg (n)- 0 - - - creg(n-1)- 1 - 1 - 2 n - countModulo 1 posedge 0 0 2 n - count + 1Wait-for 1 posedge 0 0 creg(n-1) + 1- 1 posedge 0 ≠ 0 creg(n-1) + 1This table is for asynchronous high reset.Table 8-30. Modulo Counter Truth Table — Binary Incrementing Counter,Asynchronous High Resetmode clk_en clk rst creg (n-1) creg (n)- 0 - 0 - creg(n-1)- - - 1 - 2 n - countModulo 1 posedge 0 0 2 n - count + 1Wait-for 1 posedge 0 0 creg(n-1) + 1- 1 posedge 0 ≠ 0 creg(n-1) + 1ParametersTable 8-31. Modulo Counter ParametersParameter Values Defaultclk_en_typeclk_typedout_typerst_typecountmodestylesync_rst_priorityActiveHigh,ActiveLow,NoneRising,Falling,RisingLast,FallingLast,RisingEdge,FallingEdgeActiveHigh,ActiveLowSyncActiveHigh,AsyncActiveHigh,SyncActiveLow,AsyncActiveLowValue of the count interval (1 < count < 65535)Modulo,Wait-forLFSR,BinaryIncrement,BinaryDecrementEnabled,DisabledActiveHighRisingActiveHighAsyncActiveHigh2ModuloLFSRDisabledDesign Rule Checks• An error is issued if the width of any port cannot be determined.• A warning is issued and HDL generation fails for this part if any of ports clk, rst or dout arenot connected.194ModuleWare Reference Manual, Library Version 1.9September 18, 2008