Data Sheets
The Keysight Technologies, Inc. W2642A DisplayPort AUX channel controller1 enables fast, easy and automated testing for the physical layer as well as flexible debug capability for new DisplayPort designs. DisplayPort test and design engineers can now run physical layer tests fully unattended thus doubling their productivity. When used with the W2642A, the Keysight DisplayPort source and sink compliance test solutions which are already VESA2 certified for official DisplayPort compliance testing can become fully automatic. In addition to the productivity gains, this new capability helps eliminate operator errors and offers complete device test status tracking and repeatable results.
Features
Stand Alone AUX Channel Control:
A standard process to ascertain the functionality of any DisplayPort device is to see if you can communicate with it through the standard interface, the AUX channel. With a PC as the host, a graphical user interface (GUI) is used to control the W2642A through a LAN connection. Through this GUI, you can check the operation of a DisplayPort source or sink over the AUX channel.
Source testing
Figure 2 shows the setup screen configured for testing a source. Note that the W2642A is set up as a sink.
The W2642A can initiate a source read /write process by asserting a hot plug event. This event can have varying lengths. Some events can be specified as within the range to be interpreted as an interrupt, while others can be outside this range. You can use this feature to check the source driver interpretation of the event. The W2642A can appear as any sink device by merely loading in that device’s EDID file. You can acquire that file by connecting to the device, configuring the W2642A as a source and downloading the sink’s EDID data. By using many different sets of valid EDIDs, you can check the default setup of a source as a function of the parameters read from the EDID, such as timing information or resolution.
Stand alone AUX channel control
The W2642A can provide any DPCD data desired by merely loading from a DPCD file that has acceptable data or by creating that data independently. Standard DPCD data can be acquired from a device by connecting to it and configuring the W2642A as a source and downloading its DPCD data, or by writing to it directly using the DPCD IO capabilities shown in Figure 4.
Sink testing
Figure 5 shows the setup screen configured for testing a sink. Note that the W2642A is set up as a source.
The W2642A configured as a source can read/write EDID or DPCD. In this mode, data that is read from the sink device can be compared with expected behavior, for example, symbol lock. This is particularly convenient for testing jitter tolerance on a sink or verifying that the sink state registers are operating as expected. When the W2642A is acting as a source, the EDID and DPCD screens are identical as in Figures 4 and 5 and represent actual data state of the sink device being tested when the “Read from DP function” is enabled.
In any verification process you must verify the EDID content and I2C over AUX communication using the source reading of EDID. You can verify whether your sink device works in either EDID communication method as stipulated in the DisplayPort standard using the Method 1 or Method 2 selection in the Setup tab.
Test automation
The application program interface used by the W2642A GUI to control the W2642A is also used in test automation software provided by Keysight for source and sink physical layer testing. For source testing, this feature is provided in the U7232A DisplayPort source compliance test software, and is available on versions later than version 1.7. The U7232A software was designed specifically for test automation and will run unattended after the device capabilities are defined and the scope connection details are entered in the software. This software can run the full compliance test conditions as specified in the DisplayPort Compliance Test Specification or can run specialized user defined procedures. See Table 2 for the full equipment set for the elements of the automated DisplayPort source solution.
For sink testing, the N5990A factory automation software used with other standards such as SATA, PCI Express® and HDMI, provides the necessary control to the Keysight equipment and the device under test. N5990A Option 155 provides the control to the Device under test through the W2642A Option AUX channel controller to set the state and query the registers, for example the PRBS counter register must be able to reset to 0, count a given number of errors, be queried, reset and then count errors during the jitter tolerance test and read again. The software guides you through the connection process and controls the stress signal generator as identified in the compliance test specification. See Table 1 for full automation solution requirements
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