Title: Unsupported GTH programmable divider values cause core generation error.
Description: A small number of low line rate, wide data width Wizard configurations targeting GTH transceivers result in the inferred use of currently-unsupported programmable divider settings of 80 and 100, producing the following core generation error message:
Note that Wizard version 1.4 resolves most instances of this error.
Work-around: Choose narrower user and internal data width options.
To Be Fixed: 2014.4
Status: Resolved in 2014.4 core v1.4 Rev1
Title: Line rate and clock frequency configuration options are not currently limited by the -1L VCCINT=0.90V option.
Description: The Kintex UltraScale Architecture Data Sheet (DS892) specifies that various GTH clock frequency ranges differ between VCCINT=0.90V and VCCINT=0.95V operation for -1L speed grade devices.
This restriction is not enforced by the Wizard.
Work-around: When configuring the Wizard for a -1L speed grade device that you intend to operate at VCCINT=0.90V, consult the relevant Data Sheet for transceiver operational limits.
To Be Fixed: 2015.1
Status: Resolved in 2015.1 core v1.5 Rev1
Title: Receiver termination voltage is limited to FLOAT for DC coupled links.
Description: Wizard configurations which use DC link coupling must choose FLOAT for receiver termination.
This selection is available but is not currently enforced by the Wizard.
Work-around: When customizing the Wizard core instance in the GUI, select FLOAT for the Termination field in the Receiver: Advanced section of the first tab.
To Be Fixed: 2015.3
Status: Resolved in 2015.3 core v1.6
Title: GTH CPLL reset disrupts TXOUTCLK in some UltraScale engineering sample devices.
Description: In GTH configurations targeting Kintex UltraScale ES1/ES2 and Virtex UltraScale ES1 engineering sample devices, resetting the CPLL will disrupt the TXOUTCLK signal, even when the CPLL is used for the RX data path and a QPLL is used for the TX data path.
This is due to the presence and operation of the CPLL calibration procedure which briefly takes control of the TXOUTCLK source during CPLL reset, regardless of which resources the CPLL clocks.
Work-around: This behavior cannot be avoided in GTH configurations targeting the affected engineering sample devices.
If runtime disruption to TXOUTCLK in response to resetting the CPLL is not tolerable in configurations where the CPLL drives only RX resources, you must reset and achieve lock on the CPLL prior to, or separate from bringing up TX resources.
Note: This limitation is added to the UltraScale FPGAs Transceivers Wizard Product Guide (PG182) v1.6.