JESD204B Intel® FPGA IP User Guide

ID 683442
Date 7/20/2023
Document Table of Contents

5.5. Maintaining Deterministic Latency during Link Reinitialization

Link reinitialization occurs when the RX device deasserts the SYNC_N signal after link is established.

The converters resample the SYSREF signal and reset the internal LMFC counter. When the link is initially established, the IP core automatically clears the csr_sysref_singledet bit in the syncn_sysref_ctrl register (address 0x54) when it detects the SYSREF pulse. The IP core does not automatically resample the SYSREF pulse unless the jesd204_tx_avs_rst_n or jesd204_rx_avs_rst_n signal is asserted.

If you are performing a link reset by asserting txlink_rst_n or rxlink_rst_n to reinitialize the link, set the csr_sysref_singledet bit to "1" to force the IP core to resample the SYSREF pulse without asserting the jesd204_tx_avs_rst_n or jesd204_rx_avs_rst_n signal.