Incorrect Range for Command Queue Look-Ahead Depth in ALTMEMPHY-Based Interfaces - Incorrect Range for Command Queue Look-Ahead Depth in ALTMEMPHY-Based Interfaces Description This problem affects DDR, DDR2, and DDR3, ALTMEMPHY-based products. For ALTMEMPHY-based products, the memory controller incorrectly shows the valid values for the Command Queue Look-ahead Depth to be 0, 2, 4, 8. In reality, 0 is not a valid value. The correct range of values is 1–16. Resolution The workaround for this issue is to limit yourself to 2, 4, 8, or to modify a line in the generated wrapper file, as described below: In the file < instance_name >_alt_mem_ddrx_controller_top.v , change the following line: localparam CFG_CTL_TBP_NUM = CTL_TBP_NUM; to localparam CFG_CTL_TBP_NUM = < desired value from 1–16 >; This issue will not be fixed. Custom Fields values: ['novalue'] Troubleshooting novalue True ['novalue'] ['FPGA Dev Tools Quartus II Software'] novalue 12.0 ['Programmable Logic Devices'] ['novalue'] ['novalue'] ['novalue']