MODELSIM ITERATION LIMIT REACHED HOW TO
MODELSIM ITERATION LIMIT REACHED CODE

Your pencil sketches aren't useful, however the VHDL (from your deleted stackoverflow question Error (suppressible): (vsim-3601) Iteration limit Quartus is: library ieee Here is the successful condition when clearNMar is asserted at time= 0us: Here is the Error condition when clearNMar is first asserted at 3us: QMar: OUT STD_LOGIC_VECTOR(size DOWNTO 0)) ДЄRCHITECTURE Structural_REG_4_MAR_SAP_1 OF REG_4_MAR_SAP_1 ISДЇlipFlop: D_FF_W_ENABLE_CLEAR PORT MAP(DMar(k), Esig, ClearNMar, clkMar, QMar(k)) clearNMar is the clear for the register which connects to the clear of the D flip flops.all active low.ДMar: IN STD_LOGIC_VECTOR(size DOWNTO 0) Leading into the E (enable) port of the D flip flop I included the error simulation in which clearN(N means active low) is not asserted until a few clock cycles in, and the non-error simulation, when the clear is asserted at time 'zero'

MODELSIM ITERATION LIMIT REACHED CODE

U2: NAND_3 PORT MAP(N2, Clk, ClearN, N3) ДЇinally, Here is the diagram, code and simulation of my register.

SIGNAL N1, N2, N3, N4, N5, QN: STD_LOGIC and held high(1) under normal conditions.ДЄRCHITECTURE Structural_D_FF_W_ENABLE_CLEAR OF D_FF_W_ENABLE_CLEAR IS The 'N' suffix means the signal is active low (0), ClearN: The clear signal that sets the D flip flop to zero. E: The enable signal that uses the 'S' input of the multiplexer (MUX). D: The input bit that is to be passed (latched) onto the flip flop. A positive edge triggered D flip flop with enable and clear functionality Here is the Diagram, Code and simulation of the D-flip flop which all works fine i think:

MODELSIM ITERATION LIMIT REACHED HOW TO

I apologize that I was not able to figure out how to get the signals (N1, N2.etc) onto the simulation:ДЄRCHITECTURE Structural_MUX_2_1 OF MUX_2_1 IS A diagram, the code, and the simulation is shown below. Next is the code for my 3 input OR gate: LIBRARY IEEE Next is the code for my NOT gate: LIBRARY IEEE Next is my 3 Input NAND gate code: -dataflow model of a 3 input nand gate Next is the code for my 2 input NAND gate: -dataflow model of a 2 input nand gate They definitely work though:ДЇirst, here is my 2 input AND gate: -2 Input And Gate I am only allowed to post 8 links so I will not include the waveforms for the basic NOT, AND, NAND and OR gates. Below is the code.I will provide every component that I have used and its waveform building up to the register within reason.

It should be 'ok' for it to be undefined until the input signals are latched in. If I assert the clear signal first (clearNMar, active low), I do not get the error and everything works fine.but I really should not HAVE to clear the register before using it. Each of the four D flip flops test fine by themselves, but when I test 4 of them connected together into a register, I get the 'Error (suppressible): (vsim-3601) Iteration limit'. I have created a Simulation of a 4 bit register in quartus.

Modelsim iteration limit reached