Device Family: Cyclone® IV, Cyclone® IV E, Cyclone® IV GX

Type: Answers

Area: EMIF, Intellectual Property

Why does Quartus II Fitter automatically fit a mem_dq on preassigned DM pin on Cyclone IV device?


In Cyclone® IV devices, the DM pins are preassigned in the device pinouts.

The Quartus® II Fitter treats the DQ and DM pins in a DQS group equally for placement purposes. The preassigned DQ and DM pins are the preferred pins to use.

Please reassign DQ and DM pin according in Pin Planner.