Fitter Error When Compiling DDR2 Designs Below 240MHz in DDR2 and DDR3 SDRAM Controller with UniPHY - Fitter Error When Compiling DDR2 Designs Below 240MHz in DDR2 and DDR3 SDRAM Controller with UniPHY Description For DDR2 designs operating at frequencies of 240MHz or less, the Fitter might display the error message: Can’t place Top/Bottom or Left/Right PLL . Resolution The workaround for this issue is to turn on the Remove Duplicate Registers synthesis option. Custom Fields values: ['novalue'] Troubleshooting novalue True ['PLL'] ['FPGA Dev Tools Quartus II Software'] novalue 11.0 ['Programmable Logic Devices'] ['novalue'] ['novalue'] ['novalue'] - 2021-08-25

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