Implementing a multiplier with 4 inputs and 2 outputs.

hi frz,
i need to implement a multiplier with 4 inputs and 2 outputs. can anyone suggest an efficient multiplier 2 do the same.
thx.

multiplier

Four inputs and two outputs?? Are you multiplying complex numbers?

What type of device are you using?

Re: multiplier

no iam not multiplying complex nos.just iam giving 4 8bit inputs and i have 2 get 2 outputs.

multiplier

An ordinary multiplier has two inputs and one output: Y = A * B

Maybe you mean multiplexer instead of multiplier?

Re: multiplier

sorry, i have mistaken it.it is complex multiplier.i used the following code to implement this.
whether we can prescale like this or else we can import some other efficient method 2 implement this?
plz suggest.
module signed_complex(A_R, A_C, B_R, B_C, D_R, D_C);
// D = A * B
input [7:0] A_R, A_C;
input [7:0] B_R, B_C;
output [7:0] D_R, D_C;
wire [15:0]result1,result2,result3,result4;
mult mult1(A_R,B_R,result1);
mult mult2(A_C,B_C,result2);
mult mult3(A_R,B_C,result3);
mult mult4(A_C,B_R,result4);
wire [16:0] prescale_R, prescale_C;

//assign prescale_R = {result1[7], result1} - {result2[7], result2};
// assign prescale_C = {result3[7], result3} + {result4[7], result4};

assign prescale_R = result1 - result2;
assign prescale_C = result3 + result4;

assign D_R = {prescale_R[15],prescale_R[12:6]};
assign D_C = {prescale_C[15],prescale_C[12:6]};
endmodule
module mult(a, b, out);
output [15:0] out;
input [7:0] a;
input [7:0] b;
//wire [7:0] out;
wire [15:0] out;

assign out = a * b;
//assign out = {mult_out[15], mult_out[12:6]};
endmodule
thx.

multiplier

I'm not sure what your "prescale" stuff is doing. I didn't study it.

Verilog supports signed arithmetic, so here's how I would do it. I wrote this quickly and didn't check it thoroughly for bugs, so beware!
Example calculation:
Input: (123 - 75i) * (-88 - 107i)
Output: (-74 - 26i)
It doesn't do any rounding, and the output is of course scaled down by 256 times.

Re: multiplier

thx...its working

multiplier

can you give me number of cmos multipler ic avilable in mareket and what are there specifications

Re: multiplier

4527 4-bit synchronous decade rate multiplier.
CD4527 BCD Rate Multiplier.
4089 4-bit synchronous binary rate multiplier.
CD4089BE Binary Rate CMOS Multiplier
CD4085BF CMOS Multiplier

Click to expand...

this r presently/mostly used IC's for multiplying