SLVUB62B June 2017 – November 2020
The following hardware is required to test the DP alternate mode and USB 3.0:
Use the TPS65988EVM to test DP alternate mode as well as USB data using the default firmware. To do so, connect a DP source from a laptop to the TPS65988EVM through the DP receptacle on the EVM. Next, connect a USB Type-B to USB Type-A cable from the TPS65988EVM to a Windows computer. To test DP, connect a USB Type-C to DP cable from one of the USB Type-C ports to a DP monitor. To test USB functionality, connect a USB Type-C flash drive to the other USB Type-C port on the TPS65988EVM. The monitor displays what is present from the DP source. The flash drive enumerates on the windows PC. Table 7-1 explains this test setup.
Test Setup | Pass Criteria | ||||
---|---|---|---|---|---|
DP can be connected from port A/B with a USB Type-C to DP cable. | ![]() | ||||
USB can be connected to Port A/B directly with a Type-C Flash Drive | ![]() | ||||
Connect a type C cable from DP and USB can be tested simultaneously with the TPS65988EVM setup to the right. | ![]() | ||||
Observe TPS65988EVM LEDs. | LED Name | Event Mapping | Source x988 LED Status | ||
MXCTL0 | USB3 | ON | |||
MXCTL1 | DP | ON | |||
MXCTL2 | POL | ON/OFF | |||
HPD | X | ON | |||
Variable DC/DC | X | A/B ON | |||
Check for video on DP monitor and verify USB flash drive enumerates on the PC. | Successfully copy and paste a file to and from the USB flash drive. Extend the PC to the DP monitor and play video to verify video stream. | ||||
Verify the voltages on the DP source board. | |||||
Source Test Point | Test Point Name | Voltage | |||
TP12 | P1V2 | 1.2 V | |||
TP8 | P3V3 | 3.3 V | |||
TP13 | P5V | 5 V | |||
TP5 | SYS_PWR | 20 V | |||
If video is displayed on the monitor, it is confirmed that DP alternate mode is entered. Similarly, if the USB flash drive can be read by the attached PC, it is confirmed that USB data is functioning properly. USB 3.0 data can be confirmed by observing LED MUX_CTRL0 in the high state.