The Source core sends continuous training pattern without sending data, even though the core is in-frame and the data is written into the source FIFO. This issue occurs if DataMaxT is set to 1 to 15.
DataMaxT values between 1 and 15 are not supported, although the GUI allows you to generate cores with DataMaxT set to these ranges. This range of number of SPI-4.2 bus cycles between periodic training patterns is not supported in this release. Use the valid range "0," or "16 to 65535. " Note that setting DataMaxT to "0" configures the core to never send periodic training.