The example design that can be generated for the JESD204C core in Vivado (see Example Design) delivers a JESD204 PHY core with the settings used in the JESD204C GUI. When configuring a JESD204 PHY core for use with a JESD204C core, the following values must be set:
- The transceiver type must be set to GTHE3, GTHE4, GTYE3, or GTYE4.
- The JESD204 Version must be set to JESD204C.
As highlighted in the following figure, Line Coding must be selected (64B66B or 8B10B).
It is possible to share a JESD204 PHY between instances of JESD204B and JESD204C cores because the JESD204 Version parameter is set independently for each direction (TX and RX). The value must be set to JESD204C to connect to a JESD204C core, and JESD204B for a JESD204 core. Both JESD204 and JESD204C cores support 8B10B linecoding; however, the interfaces to the JESD204_PHY are not identical. The correct version of the standard must be chosen based on which core you are intending to interface with.