Internal Error: Sub-system: BAL, File: /quartus/synth/bal/bal_ec_balancer.cpp, Line: 1463 - Internal Error: Sub-system: BAL, File: /quartus/synth/bal/bal_ec_balancer.cpp, Line: 1463 Description Due to a problem in the Quartus® II software version 12.1 and later, you may see this error during Analysis & Synthesis when compiling designs with high RAM Block usage. Resolution To work around this problem, add the following assignment to the Quartus II Settings File ( .qsf ) file: set_global_assignment -name AUTO_RAM_BLOCK_BALANCING OFF Custom Fields values: ['novalue'] Troubleshooting novalue False ['novalue'] ['FPGA Dev Tools Quartus II Software'] novalue 12.1 ['Programmable Logic Devices'] ['novalue'] ['novalue'] ['novalue']