# modules

## CCA

`CCA(Carry Carry Adder)` - `进位封闭加法器`

- [竖式 8gt CCA](./CCA-vertical-8gt)

- [竖式 10gt CCA](./CCA-vertial-20gt-32bit)

## BCS

`BCS(Borrow Carry Subtractor)` - `借位封闭减法器`

- [竖式 10gt BCS](./BCS-vertical-10gt-2t)