SLLU318 April   2020 TUSB1146

 

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2.2 TUSB1146 EQ Control

Each of the TUSB1146 receiver lanes has individual controls for receiver equalization. Table 2, Table 3, and Table 4 detail the gain values for each available combination for downstream, upstream, and all DisplayPort configurations.

Table 2. Configuration Pin-Level Definitions

Level Settings
0 Option 1: Tie 1 kΩ 5% to GND
Option 2: Tie directly to GND
R Tie 20 kΩ, 5% to GND
F Float (leave pin open)
1 Option 1: Tie 1 kΩ 5% to VCC
Option 2: Tie directly to VCC

Table 3. USB 3.1 EQ Settings

USB3.1 Downstream Facing Ports USB3.1 Upstream Facing Port
EQ Setting # EQ1 Pin Level EQ0 Pin Level EQ Gain @ 5 GHz (dB) SSEQ1 Pin Level SSEQ0 Pin Level EQ Gain @ 5 GHz (dB)
0 0 0 -1 0 0 -0.5
1 0 R 1.3 0 R 1.7
2 0 F 3 0 F 3.4
3 0 1 4.5 0 1 5
4 R 0 5.5 R 0 6
5 R R 6 R R 7
6 R F 7.5 R F 8
7 R 1 8.3 R 1 8.7
8 F 0 9 F 0 9.4
9 F R 9.5 F R 10
10 F F 10 F F 10.6
11 F 1 10.5 F 1 11
12 1 0 11 1 0 11.5
13 1 R 11.3 1 R 11.9
14 1 F 11.6 1 F 12.1
15 1 1 12 1 1 12.5

Table 4. DisplayPort EQ Settings

All DisplayPort Lanes
EQ Setting # DPEQ1 Pin Level DPEQ0 Pin Level EQ Gain @ 5 GHz (dB)
0 0 0 -0.4
1 0 R 1.3
2 0 F 2.8
3 0 1 4.1
4 R 0 6.1
5 R R 6.2
6 R F 7.1
7 R 1 7.9
8 F 0 8.6
9 F R 9.2
10 F F 9.8
11 F 1 10.3
12 1 0 10.7
13 1 R 11.2
14 1 F 11.5
15 1 1 12