Device Family: Arria® V GT, Arria® V GX, Arria® V GZ, Arria® V ST, Arria® V SX, Cyclone® V E, Cyclone® V GT, Cyclone® V GX, Cyclone® V SE, Cyclone® V ST, Cyclone® V SX, Stratix® V E, Stratix® V GS, Stratix® V GT, Stratix® V GX

Type: Answers

Area: EMIF, Intellectual Property

IP Product: DDR3 SDRAM Controller Supporting UniPHY

Error: Channel uncertainties must be greater than or equal to 0


When you use DDR3 SDRAM controller with UniPHY and follow the wiki page ( to calculate ISI parameters in the Board Settings tab of the DDR3 IP GUI, you may get a negative number. If the negative number is entered into the GUI, you will get the above error message.


To avoid the error message, enter zero if you calculate a negative number for ISI parameters.

The wiki document will be changed in a future revision to reflect this.