I want to add the 16550 uart core to avalon , do i neet to write a "gh_uart_16550_avalon_wrapper.vhd" as the author's "gh_uart_16550_amba_apb_wrapper.vhd"and "gh_uart_16550_wb_wrapper.vhd" in the core project? or write a bridge to convert Avalon to Wishbone or AMBA? If possible,which task is easy to do? The core can be found at http://opencores.org/project,a_vhd_16550_uart