Device Family: Cyclone® V GT

Type: Answers

Area: EMIF, Intellectual Property


IP Product: DDR3 SDRAM Controller MegaCore supporting UniPHY

Why does the c5gt_pro_goldentop.v file in the Cyclone V GT installation kit include ground connections for the hard memory controller?

Description

You may see a discrepancy between the following two files in the Cyclone® V GT installation kit:

- c5gt_pro_goldentop.v
- c5gt_ddr3.v

Inside the c5gt_pro_goldentop.v file, you will see a 17-bit bus ddr3a_hmc_gnd for the required ground pins in the hard memory controller. The c5gt_ddr3.v file does not include this bus. These ground pins are automatically added to the pin file during compilation by the Quartus® II software and are not needed in the RTL.

Workaround/Fix

The ddr3a_hmc_gnd output bus can be safely removed from the c5gt_pro_goldentop.v file.