To arrange for automatic displaying the source code at themoment the breakpoint is reached:  Select Preferences from the Tools menu, and then click the Debug tab. Select the Bring active source window to top option on the Debug. Select the Bring active source window to top box, and then click OK. Select the Waveform tab to see the Waveform window.

 Several times click the Run For button. 

 When the counter reaches "0", the source code window will appear and the yellow bar will point at the line where the breakpoint has been set.

 If you click the Run For button again, the simulation will go on. 

  Now, open the Preferences dialog once again, and then deselect the Bring active source window to top box.List window

Usually, transitions in a state machine depend on itsinputs.

In the previous sections we have placed transitions which force states to change on eachactive edge of the clock.

To model the behavior of a state machine under input conditions we have to add conditionsto transitions.  To add conditions, click the Condition toolbar button .  After the cursor has changed its shape, click the appropriate transition. An edit box will appear:

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As a member of Accellera and IEEE Standards Association Aldec actively participates in the process of developing new standards and updating existing standards (e.g. VHDL, SystemVerilog). Aldec provides a hardware description language (HDL) simulation engine for other EDA tools such as Altium Designer and bundles special version of its tools with FPGA vendors software such as Lattice.[1]

Resets are designed in synchronous (clocked) parts of the design. A reset is either asynchronous or synchronous. An asynchronous reset activates as soon as the reset signal is asserted. A synchronous reset activates on the active clock edge when the reset signal is asserted. The choice between a synchronous or asynchronous reset depends on the nature of the logic being reset and the project requirements.

An alternative way of coding a synchronous reset is shown below. At the clock edge, the normal operation executes. If reset is active, the result of the normal operation is overridden by the reset action.

The above examples all contain a test if rst = '1' to check whether a reset has to be performed. This is called an active high reset. The alternative, an active low reset, would reset the circuit when the reset signal is low. Both active high and active low resets are valid.

The choice between active high and active low depends on the application and the implementation platform. For example, if your project targets an ASIC technology featuring flip-flops with an active low reset input, active low reset may be the best choice. Or, for an FPGA project, it depends on the specific FPGA technology whether active high (or low) resets can be implemented more efficiently than the other type. Especially on high-fanout nets, choosing the wrong reset type can lead to timing violations.

In order to start ModelSim or Questa with the graphical interface and for the simulator to remain active after the tests have completed, set GUI=1.If you have previously launched a test without this setting, you might have to delete the SIM_BUILD directory (sim_build by default) to get the correct behavior.

The design has a data input port, a clock, active low reset, read enable, write enable, data output port, data count port, empty, full, almost empty, almost full, and error signals. The VHDL generated black box model with inputs and outputs can be seen below in figure 1.

The asserted level for the reset input signal determines whether that signal must be driven to active high (1) or active low (0) for registers to be reset in the filter design. By default, the coder sets the asserted level to active high. For example, this code fragment checks whether reset is active high before populating the delay_pipeline register:

In the Start Time Alignment page, set the alignment. The active edge of our clock is a rising edge. Thus, at time 20 ns in the ModelSim or Xcelium (20 ps in the Vivado simulator), the registered output of the raised cosine filter is stable. No race condition exists, and the default HDL time to start cosimulation is what we want for this simulation. You do not need to make any changes to the start time.

In the figure, the test bench deasserts an active-high reset signal after the interval labeled Hold Time. The test bench then asserts clock enable after a further interval, labeled Clock enable delay.

These figures show the application of a hold time, thold, for reset and data input signals. The signals are forced to active high and active low. The ResetLength property is set to 2 cycles, and the test bench asserts the reset signal for a total of 2 cycles plus thold. 0852c4b9a8

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