Critical Issue
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.
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.