arbiter.cpp

来自「SystemC可以由C语言直接开发硬件」· C++ 代码 · 共 51 行

/************************************************************************
 * file name:	arbiter.c
 * description:	implementation of arbiter module.
 *
 * modification history
 * --------------------
 * 2003-5-31 19:33:43, created by zhuwei
 */

/* includes----------------------------------------------------------- */
#include "arbiter.h"

/* defines------------------------------------------------------------ */
/* typedefs----------------------------------------------------------- */
/* externs------------------------------------------------------------ */
/* globals------------------------------------------------------------ */
/* forward declarations----------------------------------------------- */

// full cycle arbiter
void arbiter::arbitrate()
{
	if(req[l0].read() == 1)
	{
		cout << l0 << " (l0):" << sc_time_stamp() << endl;
		sel = l0 + 1;
		// l0-l2 are signal, not variable
		l0 = l1;
		l1 = l2;
		l2 = l0;
	}
	else if(req[l1].read() == 1)
	{
		cout << l1 << " (l1):" << sc_time_stamp() << endl;
		sel = l1 + 1;

		l1 = l2;
		l2 = l1;
	}
	else if(req[l2].read() == 1)
	{
		sel = l2 + 1;

		cout << l2 << " (l2):" << sc_time_stamp() << endl;
	}
	else
	{
		sel = 0;
		cout << "no item selected.\n";
	}
	
}