74181.h

该文件以systemc为核心建立了32位alu

#include <systemc.h>

SC_MODULE(a74181)
{
	sc_in<bool>		na[4];
	sc_in<bool>		nb[4];
	sc_in<bool>		s[4];
	sc_in<bool>		m, c_;

	sc_out<bool>	nf[4];
	sc_out<bool>	np, ng;
	sc_out<bool>	c4, ab_;

	void process(void)
	{
		bool	x[4];
		bool	y[4];
		bool	tf[4];
		bool	tp, tg;

		x[0] = !((na[0] & nb[0] & s[3]) | (na[0] & !nb[0] & s[2]));
		x[1] = !((na[1] & nb[1] & s[3]) | (na[1] & !nb[1] & s[2]));
		x[2] = !((na[2] & nb[2] & s[3]) | (na[2] & !nb[2] & s[2]));
		x[3] = !((na[3] & nb[3] & s[3]) | (na[3] & !nb[3] & s[2]));

		y[0] = !((!nb[0] & s[1]) || (nb[0] & s[0]) || na[0]);
		y[1] = !((!nb[1] & s[1]) || (nb[1] & s[0]) || na[1]);
		y[2] = !((!nb[2] & s[1]) || (nb[2] & s[0]) || na[2]);
		y[3] = !((!nb[3] & s[1]) || (nb[3] & s[0]) || na[3]);

		tf[0] = (x[0] ^ y[0]) ^ !(c_ & !m);
		tf[1] = (x[1] ^ y[1]) ^ !((y[0] & !m) | (c_ & !m & x[0]));
		tf[2] = (x[2] ^ y[2]) ^ !((y[1] & !m) | (c_ & !m & x[0] & x[1]) | (y[0] & x[1] & !m));
		tf[3] = (x[3] ^ y[3]) ^ !((y[2] & !m) | (c_ & !m & x[0] & x[1] & x[2]) | (y[0] & x[1] & x[2] & !m) | (y[1] & x[2] & !m));

		nf[0] = tf[0];
		nf[1] = tf[1];
		nf[2] = tf[2];
		nf[3] = tf[3];

		ab_ = !(tf[0] & tf[1] & tf[2] & tf[3]);

		tp = !(x[0] & x[1] & x[2] & x[3]);
		tg = !(y[3] | (y[2] & x[3]) | (y[1] & x[2] & x[3]) | (y[0] & x[1] & x[2] & x[3]));

		np = tp; ng = tg;

		c4 = !((tg & tp) | (!c_ & tg));
	}

	SC_CTOR(a74181)
	{
		SC_METHOD(process);
		sensitive<<na[0]<<na[1]<<na[2]<<na[3]<<nb[0]<<nb[1]<<nb[2]<<nb[3]<<s[0]<<s[1]<<s[2]<<s[3]<<m<<c_;
	}
};