用硬件描述语言编程实现减法器,实现两个操作数的减法-Using hardware descr iption language programming subtraction, and the achievement of the two operands of the subtraction

8位减法器，我在quartus 9.0版本上运行正常，大家放心下载-8-bit subtractor, I run the normal version of quartus 9.0, we rest assured Download