Honored Contributori need to enable a particular module when some condition is satisfied and each module is selected on particular condition...i have written different modules now and i need to write a top module to connect all these modules under it...can you guys help me to solve this issue?....i tried to instantiate it in case statement but it s showing error...
Honored ContributorUse a Generate statement:
generate if (someparam == 1) begin module module_i ( ports ); end endgenerateHonored Contributori tried it and could not get the code compiled...showing error...
Honored ContributorDon't expect further help if you don't provide more information about the error
Honored Contributorthis is the sample code i hav written...please check for an error ...
module arithmetic20(A,B,S,out); input A,B; input [1:0]S; output out; generate if(S==2'b00) begin and1 a1(A,B,out); end endgenerate generate if(S==2'b01) begin or1 o1(A,B,out); end endgenerate generate if(S==2'b10) begin xor1 x1(A,B,out); end endgenerate generate if(S==2'b11) begin nor1 n1(A,B,out); end endgenerate endmodule module and1(A,B,out); input A,B; output out; wire out; assign out=A&B; endmodule module or1(A,B,out); input A,B; output out; wire out; assign out=(A|B); endmodule module xor1(A,B,out); input A,B; output out; wire out; assign out=(A^B); endmodule module nor1(A,B,out); input A,B; output out; wire out; assign out=(~(A|B)); endmoduleHonored ContributorGenerates will only work with static parameters define at synthesis time. So this won't work for you. What you could do is simply:
assign out = (S == 2'b00) ? A&B : (S == 2'b01) ? A| B : (S == 2'b10) ? A^B : ~(A|B );Honored Contributorwhat you are saying is correct...the above is just an example...i have to make a control unit for alu...in alu i have done adder,multiplication and logical modules written separately in gate level...
