- #Why are signals not u modelsim altera pdf
- #Why are signals not u modelsim altera code
- #Why are signals not u modelsim altera plus
With the new signals defined, we can now modify the logic within our Sclk_process. We will be generating a gated clock signal with Sclk_raw which will be assigned to our Sclk input to our UUT (unit under test). The second signal, Sclk_raw, is a replacement clock signal. The first signal, Sclk_inh, is used to enable and disable the clock signal. First we need to create two signals to assist in the gating logic. Now we need to do a little modification to the SPI clock generation logic. The above statements change the Master clock (Mclk) and SPI clock (Sclk) to their respective rates (8 MHz and 10 MHz). To this end, we will need to tweak some of the constants to match our target clock rates, as well as some minor changes so that we can suppress the SPI clock (Sclk) to times when we are transmitting or receiving data from SPI devices. My first steps are usually focused on clock generation. I like to start my test bench design working through the fundamentals and then extending the stimulus generation until we have adequately exercised our design. This framework gives us a good starting point, from which to build our complete test bench.
#Why are signals not u modelsim altera plus
The framework also contains some canned processes for our two clock (Mclk - lines 87-94 and Sclk - lines 96-102, plus defines for clock rates - lines 62-63) and a stub version of a stimulus process (stim_proc:process - lines 105-118), which will be used to create the necessary stimulus statements to thoroughly test our design. It includes a component declaration section (lines 19-38), Input signal declarations and initializations (lines 41-48), Output declarations (lines 50-59) and the test component instantiation (lines 67-85).
#Why are signals not u modelsim altera code
The framework above includes much of the code necessary for our test bench. The Wizard then creates the necessary framework for a test bench module (see below). The "New Source Wizard" then allows you to select a source to associate to the new source (in this case 'acpeng' from the above VHDL code), then click on 'Next'. From within the Wizard select "VHDL Test Bench" and enter the name of the new module (click 'Next' to continue). To start the process, select "New Source" from the menu items under "Project".
#Why are signals not u modelsim altera pdf
This article is available in PDF format for easy printingįrom the above code, the Xilinx ISE environment makes is simple to build the basic framework for the testbench code.
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