There is a setting "What is the phase alignment of tx_in with respect to the rising edge of tx_inclock?" in the Frequency/PLL setting tab of ALTLVDS_TX. How should this phase be set?
IP
tx_in is transferred from tx_inclock to tx_coreclock inside ALTLVDS_TX.
If a timing violation occurs due to this clock crossover, please adjust this phase to avoid the timing violation.
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