Reading vectors from text file in vhdl

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You are using an out of date browser. It may not display this or other websites correctly. The remaining five text columns describe the signal values to apply to the DUT inputs. Now, over to the comments. There are two types of comments; single-line comments and trailing comments. They shall be treated differently by our testbench.

Single-line comments, like the ones at the top of the file, will be ignored. Trailing comments, on the other hand, shall be printed to the simulator console. Also, no extra leading or trailing spaces anywhere in the stimulus file. Tested on Windows and Linux Loading Gif.. First, we declare the special file object, a VHDL file handler type. Then, we declare a variable of type line.

This is simply an access type to a string, a pointer to a dynamically allocated string object. The ok variable of Boolean type is for checking that the read operations are successful. These variables are for extracting the data from each column from every line of text.

In the process body, we go straight into a while-loop that will iterate through every line of text in the stimulus file. We could have omitted the assert statements, but I want the simulation to stop if a read fails. After assigning the signal values, we wait for the specified time. Hitting the wait-statement causes the scheduled signal values to become effective with the same delta cycle.

After the last line of text from the stimulus file has been processed, the while-loop terminates. We can see that the comments are the ones from the stimulus file. I am working with altera QuartusII version I want to write a program that reads data from a text file and outputs this data serially at every positive clk edge. I have tried writing a code,but it did not work. The simulation result shows a value '1' for y data read from all the time even when reset is set '1' initially. Could someone help me in resolving this problem.

Your input file seem to have only one line of text, which starts with 1. That's why you only see a single 1 in the output. You have to split your input file into multiple lines each containing a single character. This also raises the point that we're hanging our hat on rst to hold off readlines, and we could add an enable as an embellishment. I modified eor to show when y is valid from the file.

That can easily be changed. I made a change to the path to input. Another useful modification might be to enclose the readline and read in an if statement with a condition test using function ENDFILE for the case of a short file being read. Sign up to join this community.

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