Article ID: 000085429 Content Type: Troubleshooting Last Reviewed: 10/21/2011

If you attempt to drive a PLL input with a low-speed clock the Quartus II software incorrectly prevents the connection for Cyclone IV GX

Environment

  • Quartus® II Subscription Edition
  • PLL
  • BUILT IN - ARTICLE INTRO SECOND COMPONENT

    Critical Issue

    Description

    If you attempt to drive a PLL input with a low-speed clock (the tx_clkout port of ALTGX) for non-transceiver applications, the Quartus II software incorrectly prevents the connection and issues a message similar to the following:

    Error: Port <port name> of <atom type> Atom <atom name> cannot be connected to <atom type> Atom <atom name>.

    Resolution

    To drive a PLL input with a low-speed clock (the tx_clkout port of ALTGX) for non-transceiver applications, refer to the solution available at:http://www.altera.com/support/kdb/solutions/rd12132010_299.html

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