32位无符号乘法器 采用VHDL语言编写，很容易改为有符号32位乘法器-32-bit unsigned multiplier using VHDL language, it is easy to signed 32-bit multiplier

将两个32 有符号数相除，得到一个32 位商和余数，其中余数符号与被除数符号相同。(Two 32 Division has a number of symbols, get a 32 bit quotient and remainder, the remainder with the same divisor symbol symbol.)

将两个 32 有符号数相乘，得到 一个 64 位带符号数(By multiplying two 32 signed numbers, we get a 64 bit signed number.)