AR# 69021

JESD204 - 2017.1 - UltraScale / UltraScale+ IBUFDS_GTE output instability

Description

When using the JESD204 core and PHY with clock configuration using the refclk as the core clock, clock output instability from the IBUFDS_GTE might be seen.


Solution

The IBUFDS_GTE which feeds the core_clk cannot be guaranteed to be stable until 250 us after the device configuration completes.

For this reason, the core and anything that is clocked by core_clk (for example, any AXI4-Stream logic) must be kept in reset for 250 us after device configuration completes.

This was fixed in the 2017.2 release for both the JESD204 IP and the JESD204_PHY IP with the addition of a signal called "gt_powergood".

See Figure 3‐3: UltraScale and UltraScale+ - Simple Clock example in the (PG066) product guide released on October 4, 2017.

Linked Answer Records

Master Answer Records

Answer Number Answer Title Version Found Version Resolved
68804 LogiCORE IP JESD204C - Release Notes and Known Issues N/A N/A
AR# 69021
Date 06/27/2020
Status Active
Type General Article
IP