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# 3.2 CMD/ADDR to REF_CLK Training Fail

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Possible Reason
  Signal integrity issues on CA. When CMD/ADDR to REF_CLK training fails, a dialog box appears as shown in the following figure.
  Figure 3-5.CMD/ADDR to REF_CLK Training Fail

Workaround
  Configure any one of the following parameters to a different value using the MSS Configurator when CMD/ADDR to REF_CLK (CA/CK) training fails:
  - Memory CA ODT
  - FPGA ADD/CMD Drive
  The following figure shows the configuration of CA ODT in the DDR Memory Initialization tab.
  Figure 3-6.Configuring CA ODT—DDR Memory Initialization Tab
  The following figure shows the configuration of ADD/CMD drive in the DDR Controller tab.
  Figure 3-7.Configuring ADD/CMD Drive—DDR Controller Tab