In VHDL is it possible to sequentially assign values to a variable of type INTEGER? For example, I have a behavior file that has a matrix that loads value from a variable called DIN of type INTEGER. In the testbench I would think I need to assign values that DIN can have in which case I would need 8x8 values. How can I do so when my only inputs are DIN, CLK, and START?
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1Do you have some code that shows the types and structure of the design or test bench ? Think that will greatly help understanding the question :-)Morten Zilmer– Morten Zilmer2013-08-29 11:12:07 +00:00Commented Aug 29, 2013 at 11:12
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2 Answers
I am assuming that the question can be interpreted as: "given a 2D array of integers, how can I initialize it one value at a time?"
If this is the case, here's a possible solution:
- you will need two internal signals of integer type to index the array elements (say
current_rowandcurrent_column) - you will need a reset signal to put your registers in a known state upon initialization (
current_row,current_column, and your matrix elements should be set to 0 when reset is asserted) - on every clock pulse, assign the value from d_in to an element in your matrix:
matrix(current_row, current_column) <= d_in - on every clock pulse, update
current_rowandcurrent_columnso that they cycle through the entire matrix in the correct order
The implementation details are left to the reader, but this should be enough to get you started.
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You need to store the sequential values in some kind of array, and then your testbench can step through the array assigning the values in turn to the DIN signal.
