This section provides eye diagrams and eye diagram measurements as receiver EQ increases for both linear and limited modes using the Category 3 Short Cable Model (SCM3) 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 2-1 and Figure 2-2 show the eye diagrams when TDP1204 is operating in limited mode and linear mode without signal equalization under the HDMI 2.1 Short Cable Model, respectively.

Figure 2-3 and Figure 2-4 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 Short Cable Model, respectively.

Figure 2-5 and Figure 2-6 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 Short Cable Model, respectively.

Table 2-1 summarizes the performance of the TDP1204 when modifying the receiver equalization for the Short Cable Model. For the EQ = 8 condition, the eye heights and eye widths provide the most vertical and horizontal margins for both redriver modes, respectively. However, the limited mode gives greater vertical and horizontal margins over the linear mode. Although the eye width and height vary based on EQ setting, the results for all EQ settings in the Short Cable Model show that tests pass without HDMI 2.1 mask violations for all case except when EQ is set to 0 in linear mode.