各位高手，我在使用SOPC时需要对USB的控制芯片 ISP1362写一个控制接口的IP核，用这一接口来使ISP1362外接一个摄像头，完成视频采集。这是在DE2-C70中的给出的例程，但是因为ISP1362 有三种工作方式：host,device，On The Go .我想完成摄像头采集数据的接收，即，采集的数据经过ISP1362进入我设计的片上系统，这段代码应该怎么修改，我不太懂，还请各位帮我分析一下： module ISP1362_IF( // avalon MM slave port, ISP1362, host control // avalon MM slave, hc interface to nios avs_hc_writedata_iDATA, avs_hc_readdata_oDATA, avs_hc_address_iADDR, avs_hc_read_n_iRD_N, avs_hc_write_n_iWR_N, avs_hc_chipselect_n_iCS_N, avs_hc_reset_n_iRST_N, avs_hc_clk_iCLK, avs_hc_irq_n_oINT0_N, // avalon MM slave, dcc interface to nios avs_dc_writedata_iDATA, avs_dc_readdata_oDATA, avs_dc_address_iADDR, avs_dc_read_n_iRD_N, avs_dc_write_n_iWR_N, avs_dc_chipselect_n_iCS_N, avs_dc_reset_n_iRST_N, avs_dc_clk_iCLK, avs_dc_irq_n_oINT0_N, // ISP1362 Side avs_hc_export_OTG_DATA, avs_hc_export_OTG_ADDR, avs_hc_export_OTG_RD_N, avs_hc_export_OTG_WR_N, avs_hc_export_OTG_CS_N, avs_hc_export_OTG_RST_N, avs_hc_export_OTG_INT0, avs_dc_export_OTG_INT1 ); // to nios // slave hc input [15:0] avs_hc_writedata_iDATA; input avs_hc_address_iADDR; input avs_hc_read_n_iRD_N; input avs_hc_write_n_iWR_N; input avs_hc_chipselect_n_iCS_N; input avs_hc_reset_n_iRST_N; input avs_hc_clk_iCLK; output [15:0] avs_hc_readdata_oDATA; output avs_hc_irq_n_oINT0_N; // slave dc input [15:0] avs_dc_writedata_iDATA; input avs_dc_address_iADDR; input avs_dc_read_n_iRD_N; input avs_dc_write_n_iWR_N; input avs_dc_chipselect_n_iCS_N; input avs_dc_reset_n_iRST_N; input avs_dc_clk_iCLK; output [15:0] avs_dc_readdata_oDATA; output avs_dc_irq_n_oINT0_N; // ISP1362 Side inout [15:0] avs_hc_export_OTG_DATA; output [1:0] avs_hc_export_OTG_ADDR; output avs_hc_export_OTG_RD_N; output avs_hc_export_OTG_WR_N; output avs_hc_export_OTG_CS_N; output avs_hc_export_OTG_RST_N; input avs_hc_export_OTG_INT0; input avs_dc_export_OTG_INT1; assign avs_hc_export_OTG_DATA = avs_dc_chipselect_n_iCS_N ? (avs_hc_write_n_iWR_N ? 16'hzzzz : avs_hc_writedata_iDATA) : (avs_dc_write_n_iWR_N ? 16'hzzzz : avs_dc_writedata_iDATA) ; assign avs_hc_readdata_oDATA = avs_hc_read_n_iRD_N ? 16'hzzzz : avs_hc_export_OTG_DATA; assign avs_dc_readdata_oDATA = avs_dc_read_n_iRD_N ? 16'hzzzz : avs_hc_export_OTG_DATA; assign avs_hc_export_OTG_ADDR = avs_dc_chipselect_n_iCS_N? {1'b0,avs_hc_address_iADDR} : {1'b1,avs_dc_address_iADDR}; assign avs_hc_export_OTG_CS_N = avs_hc_chipselect_n_iCS_N & avs_dc_chipselect_n_iCS_N; assign avs_hc_export_OTG_WR_N = avs_dc_chipselect_n_iCS_N? avs_hc_write_n_iWR_N : avs_dc_write_n_iWR_N; assign avs_hc_export_OTG_RD_N = avs_dc_chipselect_n_iCS_N? avs_hc_read_n_iRD_N : avs_dc_read_n_iRD_N; assign avs_hc_export_OTG_RST_N = avs_dc_chipselect_n_iCS_N? avs_hc_reset_n_iRST_N: avs_dc_reset_n_iRST_N; assign avs_hc_irq_n_oINT0_N = avs_hc_export_OTG_INT0; assign avs_dc_irq_n_oINT0_N = avs_dc_export_OTG_INT1; endmodule