Simulation Fails for UniPHY External Memory Interfaces with Undefined System Task Call Error - Simulation Fails for UniPHY External Memory Interfaces with Undefined System Task Call Error Description An issue with the JTAG Avalon master can cause simulation to fail with the following error message: Error-[UST] Undefined System Task Call submodules/altera_pli_streaming.v, 53 Undefined System Task call to ‘’. Resolution The workaround for this issue is to remove the altera_pli_streaming file from the list of files used in the simulation if the programming language interface (PLI) is turned off. Custom Fields values: ['novalue'] Troubleshooting novalue True ['Simulation'] ['FPGA Dev Tools Quartus II Software'] 11.1 11.0 ['Programmable Logic Devices'] ['novalue'] ['novalue'] ['novalue']