Why does SLS USB 2.0 host controller IP not work? - Why does SLS USB 2.0 host controller IP not work? Description Due to a problem in the Quartus II software, when compiling a design with the System Level Solutions' USB 2.0 host controller IP, you may run into an error indicating the files u20hc_Tran_FIFO_1.v and u20hc_Tx_Rx_RAM.v are missing. Resolution To work around this problem, open the file sls_avalon_usb20hc_hw.tcl in the directory < Quartus II installation >/ip/sls/usb20hc/hardware/component/ . Edit the following two lines: add_file "hdl/u20hc_Tran_FIFO_1" {SYNTHESIS } add_file "hdl/u20hc_Tx_Rx_RAM" {SYNTHESIS } to include ".v" after the file names. The edited lines should look like this: add_file "hdl/u20hc_Tran_FIFO_1.v" {SYNTHESIS } add_file "hdl/u20hc_Tx_Rx_RAM.v" {SYNTHESIS } This problem is scheduled to be fixed in a future release of the Quartus II software. Custom Fields values: ['novalue'] Troubleshooting novalue False ['novalue'] ['novalue'] novalue novalue ['Programmable Logic Devices'] ['novalue'] ['novalue'] ['novalue']