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# 5.1 CMD/ADDR to REF_CLK Training Fail

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Possible Reason
  Signal integrity issues on CA. When the CMD/ADDR to REF_CLK training fails, a dialog box appears as shown in the following figure.
  Figure 5-1.CMD/ADDR to REF_CLK Training Fail

Workaround
  Configure the FPGA ADD/CMD Drive to a different value using the MSS Configurator when the CMD/ADDR to REF_CLK (CA/CK) training fails.
  The following figure shows the configuration of the ADD/CMD drive in the DDR Controller tab.
  Figure 5-2.Configuring ADD/CMD Drive—DDR Controller Tab