Device Family: Arria® V

Device Family: Cyclone® V

Type: Answers

Type: Errata

Area: EMIF

Area: Intellectual Property



Warning Message Displayed When Driving User Logic with Custom PLL in Hard Memory Interface

Description

This problem affects DDR2 and DDR3 products.

External memory interfaces targeting Arria V or Cyclone V devices and using the hard memory controller will generate warning messages if you drive user logic with a PLL other than the AFI clock.

The following warning messages are displayed (where SingleInterface_mem_if_ddr3_emif_0. is a user-specified name):

Critical Warning: SingleInterface_mem_if_ddr3_emif_0_p0_pin_map.tcl: Failed to find PLL clock for pins Warning: SingleInterface_mem_if_ddr3_emif_0_p0_pin_map.tcl: Could not find all DRIVER CORE CK pins

Workaround/Fix

The workaround for this issue is as follows:

  1. Open the pin-mapping script in a text editor.
  2. In the pin-mapping script, locate the following lines:
  3. if {[get_collection_size [get_registers -nowarn (driver_core_ck_pins)]] > 0} { �

    Replace the above lines with the following:

    if {[string compare -nocase (driver_core_ck_pins) ""] != 0 && [get_collection_size [get_registers -nowarn (driver_core_ck_pins)]] > 0} {

  4. In the SDC file, change the pll_driver_core_clock to the clock that drives the user logic.

This issue will be fixed in a future version.