Description
The rx_clk output signal for SDI RX in SD/ HD / 3G video mode has a high amount of jitter. Therefore, rx_clk cannot be used to directly transmit data.
Resolution
The general recommended approach to system clocking with the SDI Megacore function is to use an external chip such as a VCXO or a clock cleaner. The VCXO or clock cleaner should lock to the rx_clk or rx_data_valid_out signals of the RX SDI Megacore. The clean VCXO or clock cleaner output would then be used as the transmit clock (tx_serial_refclk)
Figure 1. SDI
