full subtractor using case statement...plzz tell me error

Status
Not open for further replies.
R

rids1

Newbie level 4
Joined
Dec 4, 2013
Messages
6
Helped
1
Reputation
2
Reaction score
0
Trophy points
1
Activity points
33
module full_sub(a,a1,c,d,b,e);
input a,a1,c;
output reg d,b,e;

always@(a1 or a or c)
begin
e={a,b,c};

case(e)
000:
begin
d=0;
b=0;
end

001:
begin
d=1;
b=1;
end

010:
begin
d=1;
b=1;
end

011:
begin
d=0;
b=0;
end


100:
begin
d=1;
b=0;
end

101:
begin
d=0;
b=0;
end

110:
begin
d=0;
b=0;
end

111:
begin
d=1;
b=1;
end
endcase
end

endmodule
 

plz tell me hw i can correct it........
 

is it e={a,b,c}; or
e={a,a1,c};


also 'e' is declared as one bit, but e={a,b,c} is three bit
so the tool will truncate the three bit into one bit.

so case expression never matches..
 

Status
Not open for further replies.

Similar threads

Menu
Log in
Register
Cookies are required to use this site. You must accept them to continue using the site. Learn more…