Ripple Adder: 16-bit 全加,半加及ripple adder的设计及VHDL程序 Carry Look ahead Adder:4, 16, 32 bits 前置进位加法器的设计方案及VHDL程序 Carry Select Adder:16 Bits 进位选择加法器的设计方案及VHDL程序-Ripple Adder : 16-bit full adder, semi-Canada and the ripple adder design and VHDL procedur

32bit carry select adder

32位进位选择加法器，预置逻辑0和逻辑1，各模块并行运行，只要通过进位位选择逻辑0或者逻辑1即可，提高了运行速度。-32-bit carry select adder, preset logic 0 and logic 1, the modules run in parallel, as long as through the carry bit selection logic 0 or logic 1 can improve the speed.

因为二进制加法的进位只可能是1或0，所以可以将32位加法器分为8块（最低一块由4位先行进位加法器直接构成，其余加法结构都采用先行进位加法器结构）分别进行加法计算，除最低位以外的其他7块加法器结构各复制两份，进位输入分别预定为1和0。于是，8块加法器可以同时进行各自的加法运算，然后根据各自相邻低位加法运算结果产生的进位输出，选择正确的加法结果输出。-Because binary adder carry only be 1 or 0, so it can be 32-bit adder is div

32位进位选择加法器 用四位先行进位加法器扩展成32位二进制加法器-32 carry select adder Used four carry-lookahead adder extended to 32-bit binary adder