Hi there, I'm having trouble getting this array multiplier working correctly and I can't figure out what the problem is. If someone could just glance at my code it'd really help

module array_multiplier ( output [15:0]P, input [7:0]A, input [7:0]B ); wire [55:0]Sum; wire [6:0]Cout; assign P[0] = A[0] & B[0]; //Level 1 ripple_carry_adder RCA1(Cout[0], Sum[7:0], {1'b0, B[0] & A[7:1]}, B[1] & A[7:0],1'b0); assign P[1] = Sum[0]; //Level 2 ripple_carry_adder RCA2(Cout[1], Sum[15:8], {Cout[0], Sum[7:1]}, B[2] & A[7:0],1'b0); assign P[2] = Sum[8]; //repeat.... //Level 7 (last level) ripple_carry_adder RCA7(Cout[6], Sum[55:48], {Cout[5], Sum[47:41]}, B[7] & A[7:0],1'b0); assign P[7] = Sum[48]; assign P[8] = Sum[49]; assign P[9] = Sum[50]; assign P[10]= Sum[51]; assign P[11]= Sum[52]; assign P[12]= Sum[53]; assign P[13]= Sum[54]; assign P[14]= Sum[55]; assign P[15]= Cout[6]; //module module ripple_carry_adder ( output Cout, output [7:0]Sum, input [7:0]A, input [7:0]B, input Cin ); |

O'Shea wrote: > I'm having trouble getting this array multiplier working correctly Andwhatkind of trouble is that? Are there any errors or warnings?

Sorry I should have been more specific, it compiles okay it just doesn't function properly. When both A[0] and B[0] are 1's then it produces a number with a 1 in P[0] like it should. However, when either A[0] and B[0] are not 1 it produces zero in P[15:0]. In my vector file I have Sum as a variable to watch but it says that it cannot find any instances of Sum (any of them, it gives me many many warnings), which is unfortunate because I could use that to do a little debugging

```
> Sorry I should have been more specific, it compiles okay it just doesn't
function properly.
Where did you check the function? In simulation or on hardware?
Duke
```

Hello, maybe someone know how to implement divider in VHDL when i have just Multiplier ? thanks.

Why does everybody add his/hers NEW question to and ancient post? With a new question start a new thread, pls.! And there you can write, whether you want the division for synthesis or "only" for simulation. And maybe also, which toolchain from which supplier you use. And all the necessary additional information that may be helpful (word width, speed, precision...)...