The equalization setting used on the TUSB564-Q1 is setting #13. This adds 13.0dB of gain on the DisplayPort lanes routing through the device. Following are the results of an 8.1Gbps DisplayPort compliance test taken at the downstream end of this system.

Figure 5-6 DisplayPort 4.6-Meter System Test Results at 8.1Gbps Lane 0

Figure 5-7 DisplayPort 4.6-Meter System Test Results at 8.1Gbps Lane 1

Figure 5-8 DisplayPort 4.6-Meter System Test Results at 8.1Gbps Lane 2

Figure 5-9 DisplayPort 4.6-Meter System Test Results at 8.1Gbps Lane 3

The compliance test is able to pass in this configuration with no issues. The eye diagram shows a defined eye opening and transition area. As seen from the eye diagram, attenuation is greater at 8.1Gbps than at 5.4Gbps, which is expected. This is the reason a greater equalization value is needed in this test compared with the previous 5.4Gbps DisplayPort test.