How do i write for i= 0:63 :360 (matlab code) in VHDL .searched for long about for loops but couldn't see any instance of the above form. Is defining an array and writing "for in A"the only way??
--- Quote Start --- ... for i= 0:63 :360 (matlab code) in VHDL ... --- Quote End --- Did you choose purposely an increment that doesn't match to the exit condition?
Does your example evaluates in the following: for i = 0, 63, 126, 189, 252, 315 : the loop body is executed i = 378 : the loop is exited Do you have to compare i to 360 instead of 378?
in VHDL, the loop variable is an integer if you use a for loop:
for i in 0 to 63 loop
end loop;
will loop 64 times. for a while loop, you can do whatever you want:
variable i : real : 0.0;
while i < 1.0 loop
....
i := i + 0.001;
end loop;
@jb123 yes that is what i have asked; at few places in my code i have to deal with large integers like 0:64 :10000 , i can't keep giving values; i think i have to create a loop to define a array as such and then gave the array range to the for loop ;
Correct me if I am wrong; @Tricky : How do i use a constraint without using a while loop? any alternative loop which can be synthesisable and serves the purpose??
The way to start thinking about this - stop thinking about loops and code constructs and think about what the underlying circuit should look like. VHDL stands for VHSIC Hardware Description Language. The key word there is description as VHDL is used for describing a circuit. Without understanding the circuit, how do you expect to write the VHDL?
Matlab -> VHDL is not a straightforward conversion.
Okay. I know what the circuit does. I will be able to write it in vhdl. But can you refer me an article which says synthesisable loops and packages so that i would not commit mistakes again.Please
For synthesis, for loops will unroll into parallel hardware. and if you need a while loop you're doing something wrong and clearly dont understand the circuit.
I suggest drawing the circuit out (on paper, or MS visio or similar) before writing any VHDL.
