Type: Answers

Type: Errata

Area: EMIF

Area: Intellectual Property



SoC Designs With HPS Memory Interface and FPGA Memory Controller on Cyclone V Devices Can Encounter Error

Description

This problem affects DDR2, DDR3, and LPDDR2 products.

A design targeting a Cyclone V device, with both an HPS memory interface and an FPGA hard or soft memory controller, can encounter an error due to a limitation in the pin_assignments.tcl script. If the HPS pin_assignments.tcl script is run before the FPGA pin_assignments.tcl, the I/O assignment for the RZQ pin on the HPS can be overwritten by the FPGA script, resulting in an error message similar to the following:

Error (175001): Could not place pin Info (175028): The pin name: <your_design_name>_hps_oct_rzqin Error (184016): There were not enough single-ended input pin locations available (5 locations affected)

Workaround/Fix

The workaround for this issue is to manually change the I/O standard assignment for the HPS RZQ pin to SSTL-15 CLASS I after running the pin_assignments.tcl for both interfaces.

This issue will be fixed in a future version.