Minimum period: No path found


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Apr 30, 2016
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Hi. I am trying out booth multiplier and trying to find minimum period. But the timing summary shows
Timing Summary:
---------------
Speed Grade: -5

Minimum period: No path found
Minimum input arrival time before clock: No path found
Maximum output required time after clock: No path found
Maximum combinational path delay: 45.021ns

I have given clock input in my code but still minimum period is not shown.How to solve this problem?

This is my booth multiplier code:

module boothmu(x,y,z,clk);
input clk;
input signed[7:0]x,y;
output signed[15:0] z;
reg signed [15:0] z, a;
reg signed[1:0] temp;
integer i;
reg signed e1;
reg signed[7:0] y1;
[email protected](clk,x,y)
begin
z=16'd0;
e1=1'd0;
for(i=0;i<8;i=i+1)
begin
temp={x,e1};
y1=-y;
case(temp)
2'd2:z[15:8]=z[15:8]+y1;
2'd1:z[15:8]=z[15:8]+y;
default: begin end
endcase
z=z>>1;
z[15]=z[14];
e1=x;
end
if(y==8'd8)
begin
a= -z;
end
end
endmodule
 
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