I have to execute an following Queue model in my system verilog testbench and it’s showing an error as (define int h[8]= {0,1,2,3,4,5,6,7} as constant type) And I have tried everything to solve the error but nothing is working out.I hope that you guys ca help me out. My code looks something like this
int h[8]= {0,1,2,3,4,5,6,7};
begin
for(int n = 0; n<8; ++n)begin
int sum = 0;
for(int k = 0; k<n; ++k)begin
sum += h[k]*x[n-k];
end
end
end
In reply to confused kid:
There are no queues in the example you posted. Please try to give us a complete self-contained example that someone can try to run and help you.
This is not a queue. It is a fixed size array. You have to elaborate the issue. For the current implementation as shown, use a tick (') before assigning the values as follows:
int h[8]= '{0,1,2,3,4,5,6,7}; // ' before assignment
I’m new in this system verilog concept and I’m sorry for the confusion. I wanted to change the value of h[k] for each clock cycles until 16 clock cycles and I wanted to do something like this
sum = 0x[n-k] for first clock cycle
sum = 0x[n-k] + 1*x[n-k] for second clock cycle
and so on for 16 clock cycles
int h[k]= {0,1,2,3,4,5,6,7};
begin
for(int n = 0; n<8; ++n)begin
int sum = 0;
for(int k = 0; k<n; ++k)begin
sum += h[k]*x[n-k];
end
end
end
In reply to confused kid:
It’s difficult to teach you SystemVerilog in a forum. I suggest you take some tutorials first, and then go back to your problem.
And you are not being very clear in your questioning. The only difference between the code in you second post is you change int h[8] to int h[k]. Do you mean to be using a subscript hk? You can’t write that in your source code. And now you bring up clock cycles, which you never mentioned in your original question.
Thanks, I’m sorry for not posting the question in the right way at the first place only because It’s my first time posting questions in any forum.
And yeah Is their any way I can execute summation in system verilog which has subscripts like h[k] and x[n-k] because I was able to execute similar problem in other languages like c,c++ and python
In reply to confused kid:
Here’s what I mean by a complete self-contained example using your original post and adding the necessary code to compile and run it.
module top;
int h[8]= {1,2,3,4,5,6,7,8}; // I'm assuming these numbers are arbitrary
int x[8]= {1,2,3,4,5,6,7,8}; // You never showed this declaration
int sum;
initial begin
for(int n = 0; n<8; ++n)begin
sum = 0;
for(int k = 0; k<=n; ++k)begin
sum += h[k]*x[n-k];
end
$display(n,, sum); // I added this for debugging
end
end
endmodule
#include <iostream>
using namespace std;
int main(){
int h[8]= {0,1,2,3,4,5,6,7};
int x[8] = {1,2,1,1,2,2,1,0};
int y[8] = {0};
for(int i:y)
while(--i > 0){
for(int n = 0; n < 8; ++n){
int sum = 0;
for(int k = 0; k < n; ++k){
sum += h[k]*x[n-k];
}
y[n]= sum;
}
for(int i:y)
cout<< i<< endl;
}
}
In reply to confused kid:
Hi Dave,
if i want to randomize the fixed array how can I do that. I mean in the above example if i want to randomize h[k] or x[k]. How Can I do that?? I mean Can I just create a class such as
In reply to confused kid:
I am trying to help you, but you are making it very difficult and not putting enough effort to show working code and expected output. Your C++ code produces no output because y is all 0 and you are iterating over
for(int i;y). Also, the code you just showed now has 4 nested loops, but your original code had only 2. Anyways, here is the your non-working code translated to SystemVerilog
module top;
int h[8]= {0,1,2,3,4,5,6,7};
int x[8] = {1,2,1,1,2,2,1,0};
int y[8] = '{default:0};
initial
foreach(y[ii]) begin : loop1
int i;
i = y[ii];
while(--i > 0) begin : loop2
for(int n = 0; n < 8; ++n) begin : loop3
automatic int sum = 0;
for(int k = 0; k < n; ++k)begin : loop4
sum += h[k]*x[n-k];
end : loop4
y[n]= sum;
end : loop3
foreach(y*) $display(y[i]);
end : loop2
end : loop1
endmodule : top
The foreach loop replaces C++ range-based for loop.
By default, all variable declarations outside of classes are static variables. If you want a loop variable initialized each time through the loop, you have to declare them as automatic, or split the declaration and initialization into separate lines.
I added optional block labels to make the code easier to follow (loop1,…)
[i]In reply to confused kid:*
You don’t have to put variables in a class to randomize them, you can call std::randomize(x). You have to put that in your procedural code, not as part of the variable declaration. randomize() returns true or false depending on the success of the randomization.
if ( !std::randomize(h)) with {foreach(h[k]) h[k] inside {[0:8]};} )
$error("randomization failed");
Thanks for baring with me and sorry for all the mistakes I have done.I wrote the c++ code just out of my head in the message box here.So I was not able to execute it i’m really sorry for it.
And also what if their is a case where i want to use the same h[k] in two modules like in the case of an checker where I have to make sure that the expected output and computed output are both equal.So the way i declared the random variable above will it work in my scoreboard???