alt_up_vga_dev* alt_up_vga_open_dev(const char* name);

Thanks! i had readed VGA.pdf,but it wouldn't run on DE2 board.i build NIOSii+SDRAM+VGA Core(no buffer)+Development Board External Interface(VGA clk+SDRAM clk). i want to ask a question about VGA Core CLK.IN VGA pdf,the VGA Core need 25Mhz.avalon_pixel_slavePort need 50Mhz.