情境
A student needs to understand the top-level block structure of a 4-bit adder-subtractor for a digital design lab.
這張圖裡有什麼
看懂背後的決策。
01
Use XOR gates on B inputs controlled by M
02
Propagate carry between full adders
03
M doubles as carry-in for subtraction
When explaining or documenting combinatorial arithmetic circuits at the architectural level.