This contains a Full adder, capable of adding 3 bits. More detailed information can be found on Wikipedia.
In particular, this is based on (source : wikimedia commons)
This circuit has 3 distinct stages, thus need about 3 ticks for the output to stabilize. This uses Basic gates with pcb! macro to generate the struct.
This needs :
- 2 Xor gates
- 2 And gates
- 1 Or gate
This exposes
- bit1 as input bit 1
- bit2 as input bit 2
- cin as input carry
- sum as output sum
- carry as output carry
- p as the output of bit1 xor bit2 (needed for CLA adder)
This needs 3 ticks from input to stable output