这是usb1.1协议,对于了解通用串行总线有很好的帮助,

				#include "systemc.h"				#include "usb_fifo64x8.h"								SC_MODULE(test) {					sc_in clk;					sc_out rst, clr;					sc_out din;					sc_in dout;					sc_out we, re;					sc_in empty, full;									int i;									void update(void) {						i = 0;						rst.write(false);						clr.write(false);						we.write(false);						re.write(false);						wait();						rst.write(true);						wait(clk.posedge_event());						we.write(true);						while (!full.read()) {							din.write(i++);							wait(clk.posedge_event());							wait(clk.negedge_event());							cout 						}						we.write(false);						wait(clk.posedge_event());						re.write(true);						while (!empty.read()) {							wait(clk.posedge_event());							wait(clk.negedge_event());							cout 						}						re.write(false);						wait();						wait();						sc_stop();					}									SC_CTOR(test) {						SC_THREAD(update);						sensitive_pos(clk);					}				};								int sc_main(int argc, char *argv[]) {									sc_set_time_resolution(1.0, SC_NS);									sc_clock clk("clock", 10.0, SC_NS);					sc_signal din, dout;					sc_signal rst, clr, we, re, empty, full;									usb_fifo64x8 i_fifo("FIFO");					test i_test("TEST");									i_fifo.clk(clk);					i_fifo.rst(rst);					i_fifo.clr(clr);					i_fifo.we(we);					i_fifo.din(din);					i_fifo.re(re);					i_fifo.dout(dout);					i_fifo.empty(empty);					i_fifo.full(full);									i_test.clk(clk);					i_test.rst(rst);					i_test.clr(clr);					i_test.din(din);					i_test.dout(dout);					i_test.we(we);					i_test.re(re);					i_test.empty(empty);					i_test.full(full);									sc_trace_file *log = sc_create_vcd_trace_file("FIFO_TEST");					sc_trace(log, clk, "Clock");					sc_trace(log, din, "DataIn");					sc_trace(log, dout, "DataOut");					sc_trace(log, empty, "Empty");					sc_trace(log, full, "Full");									//sc_start(1000, SC_NS);					sc_start();									sc_close_vcd_trace_file(log);									return 0;				}