void TD_Init(void)
{    CPUCS = ((CPUCS & ~bmCLKSPD) | bmCLKSPD1);//设置CPU时钟频率为48M//USBCS = Ox80;  //set high speed mode 添加此语句时工程编译不通过
IFCONFIG = 0XCB;                                       //选择内部时钟频率为48M,FIFO/GPIF采用异步操作模式，SLAVE FIFO接口（外部主控制器）
    SYNCDELAY;                                             //同步延时REVCTL = 0X03;    //0x01                               //版本号
    SYNCDELAY;FIFOPINPOLAR = 0X00;                                //所有引脚为低电平有效
    SYNCDELAY;                                    FIFORESET = 0X80;                                      //对从主机发送的数据进行握手
    SYNCDELAY;FIFORESET = 0X02;                                   //复位FIFO
    SYNCDELAY;FIFORESET = 0X04;                                   //复位FIFO
    SYNCDELAY;FIFORESET = 0X06;                                   //复位FIFO
    SYNCDELAY;FIFORESET = 0X08;                                   //复位FIFO
    SYNCDELAY;FIFORESET = 0X00;                                   //保存操作
    SYNCDELAY;EP6CFG =0xE0;                                      //使能端点6，端点方向为输入，块传输方式，端点大小512字节，端点为4重缓冲
    SYNCDELAY;  EP6FIFOCFG = 0X0C;                                    // AUTOIN=1 ZEROLEN=1 WORDIDE=0 设置端点6为自动输入，选择总线数据宽度为8位
    SYNCDELAY;                                    PINFLAGSAB = 0X00;                                    //确定引脚FLAGA为EPX的PF标志，FLAGB为EPX的FF标志，FLAGC为EPX的EF标志///
    SYNCDELAY;                                    PINFLAGSCD = 0X00;                                     //确定引脚FLAGA为EPX的PF标志，FLAGB为EPX的FF标志，FLAGC为EPX的EF标志///
    SYNCDELAY;                                    PORTACFG = 0X40;                                  //PORTACFG.6=1 设置IOPA7为CS引脚
    SYNCDELAY;                                    EP6AUTOINLENH = 0X02;                              //端点6 AUTOIN包长度高字节
    SYNCDELAY;                                    EP6AUTOINLENL = 0X00;                            //端点6 AUTOIN包长度高字节
    SYNCDELAY;  EP6BCH = 0x02;                                     //512byte///*
    SYNCDELAY;EP6BCL = 0x00;                                     //512byte///*
    SYNCDELAY;                      EP6FIFOPFH = 0X80;                                //端点6/SLAVE FIFO 可编程成级标志的高位（高速方式和全速方式）
    SYNCDELAY;                                        EP6FIFOPFL = 0X00;                               //端点6/SLAVE FIFO 可编程成级标志的高位（高速方式和全速方式)
    SYNCDELAY;                                    /*    OUTPKTEND =0X82;                                //启动OUT缓冲区SYNCDELAY;                                    OUTPKTEND =0X82;                                //启动OUT缓冲区SYNCDELAY;
*///AUTOPTRSETUP |= 0x01;                            //使能自动指针
        Rwuen = TRUE;       }

void TD_Poll(void) // Called repeatedly while the device is idle
{

}

/* Generate USB read/write access request*/
always @(negedge Clk_5M or negedge reset_n)
beginif (~reset_n ) beginaccess_req<=1'b0;endelse beginif (usb_flagb & (bus_busy==1'b0))     //EP6的FIFO不满，而且状态为idleaccess_req<=1'b1;                             //USB写请求else access_req<=1'b0;end
end/* Generate USB write command*/
always @(posedge Clk_5M or negedge reset_n)beginif (~reset_n) beginusb_fifoaddr<=2'b10;usb_slcs<=1'b0;        usb_sloe<=1'b1;        usb_slrd<=1'b1;    usb_slwr<=1'b1;usb_fd_en<=1'b0;    usb_state<=IDLE;         end        else begincase(usb_state)IDLE:beginusb_fifoaddr<=2'b10;    i<=0;usb_fd_en<=1'b0;                      if (access_req==1'b1) begin                                   usb_state<=EP6_GET_DATA;                //开始GET数据bus_busy<=1'b1;                       //状态变忙end                else beginbus_busy<=1'b0;          usb_state<=IDLE;  end     end      EP6_GET_DATA:beginif(i==8) begin                        i<=0;    usb_state<=EP6_GET_OVER;//    data_reg<=shift_reg;                       //读取数据data_reg<=oe_ranNum;endelse begin                      i<=i+1'b1;endend          EP6_GET_OVER:beginif(i==4) begin                        i<=0;    usb_fifoaddr<=2'b10;                            usb_state<=EP6_WR_CMD;endelse begin                  i<=i+1'b1;endend    EP6_WR_CMD:begin          if(i==8) beginusb_slwr<=1'b1;i<=0;                            usb_state<=EP6_WR_OVER;endelse beginusb_slwr<=1'b0;    usb_fd_en<=1'b1;                     //数据输出                        i<=i+1'b1;endend          EP6_WR_OVER:begin          if(i==4) beginusb_fd_en<=1'b0;bus_busy<=1'b0;i<=0;                            usb_state<=IDLE;endelse begin          i<=i+1'b1;endenddefault:usb_state<=IDLE;endcaseendend  assign usb_fd = usb_fd_en?data_reg:8'bz;