Product guide

Troubleshooting
XAPP1178 (v2.0) January 23, 2015 www.xilinx.com 26
Troubleshooting
This section provides debugging steps for issues in the policy maker software.
There are help menu options provided to read MSA values, EDID information, Link and Lane
status, and DPCD status. There is also another option to enter the four-digit hexadecimal
register offset and the number of registers to read the DPCD register values through the aux
interface. Enter the four-digit hexadecimal register offset for any DPCD registers, to know the
exact status of the system.
Check the following if the design does not work with the provided ready_for_download
files:
1. Ensure the quality of the DisplayPort cables.
2. Check if DisplayPort mode is selected in the sink monitor.
3. Ensure the capability of the DisplayPort supported monitor, that is, if it is v1.2a compatible,
if it supports MST, and if the SST or MST mode is selected for monitors that support both
the modes.
4. Check that the DP cables are connected properly if you are testing the MST mode with daisy
chained monitors. Ensure proper connections for DPin and DPout ports.
5. Check the support for the possible resolutions and bits per color (BPC) options for the
monitor that you are testing.
6. Try changing the resolution and BPC from serial port.
References
1. VESA DisplayPort Standard Specification
2. KC705 MIG Design Creation with Vivado (XTP196
) (Link to access Sign in to Xilinx)
3. Vivado Design Suite Tutorial: Embedded Processor Hardware Design (UG940
)
4. LogiCORE IP DisplayPort Product Guide (PG064
)