- #1
beyondlight
- 65
- 0
I'm designing a carry lookahead 8bit adder. My problem is that i don't know how to calculate the group generate signal.
I have 4 G signals:
First level:
G1:0
G3:2
G5:4
G7:6
And these have to be added together:
Second level:
G3:0
G7:4
Third level:
G7:0
Two different formulas for computing G:
Gi:0 = Gi +Pi * Gi-1:j eq. (1)
Gi:j = Gi:n+Pi:n * Gn-1:j eq. (2)I know how to use (1) for G1:0 but for G3:2 and further on i don't know how to do.
My book doesn't explain this well at all. (Integrated Cirucit Design, Pearson)
I have 4 G signals:
First level:
G1:0
G3:2
G5:4
G7:6
And these have to be added together:
Second level:
G3:0
G7:4
Third level:
G7:0
Two different formulas for computing G:
Gi:0 = Gi +Pi * Gi-1:j eq. (1)
Gi:j = Gi:n+Pi:n * Gn-1:j eq. (2)I know how to use (1) for G1:0 but for G3:2 and further on i don't know how to do.
My book doesn't explain this well at all. (Integrated Cirucit Design, Pearson)