This section provides eye diagrams and eye diagram measurements as receiver EQ increases for both linear and limited modes using the Category 3 Worst Cable Model (WCM3) Eye Mask Test. The three different EQ settings, no equalization (0x0h), mid-range equalization (0x8h) and the highest equalization (0xFh) samples how EQ affects the waveform’s eye diagram. There were no modifications between the results provided in this section with respect to the test setup or register settings. The VoD and termination settings for these tests were set at 0x3h and 0x2h, respectively.

Figure 2-7 and Figure 2-8 show the eye diagrams when TDP1204 is operating in limited mode and linear mode without signal equalization under the HDMI 2.1 Worst Cable Model, respectively.

Figure 2-9 and Figure 2-10 show the eye diagrams when TDP1204 is operating in limited mode and linear mode with signal equalization set to 8 under the HDMI 2.1 Worst Cable Model, respectively.

Figure 2-11 and Figure 2-12 show the eye diagrams when TDP1204 is operating in limited mode and linear mode with signal equalization set to the highest equalization setting under the HDMI 2.1 Worst Cable Model, respectively.

Table 2-2 summarizes the performance of the TDP1204 when modifying the receiver equalization for the Worst Cable Model. Similar to the Short Cable Model data, the limited mode gives greater vertical and horizontal margins over the linear mode for all sampled EQ settings. When EQ = 0 or EQ = F the linear redriver experiences HDMI mask violations. The EQ = 8 condition provides the most vertical and horizontal margins for the linear redriver mode which illustrates the importance of selecting the correct EQ setting to avoid eye mask violations.