SLLU377 April 2024 TUSB521-Q1
Equalization (EQ) can be controlled using I2C or pin-strapping. Each of the TUSB521-Q1 receiver lanes has individual controls for receiver equalization (see Configuration Pin-Level Definitions). Table 3-3 list the gain values of each available combination of downstream and upstream configurations.
| Level | Settings |
|---|---|
| 0 | Option 1: Tie 1kΩ 5% to GND |
| Option 2: Tie directly to GND | |
| R | Tie 20kΩ 5% to GND |
| F | Float (leave pin open) |
| 1 | Option 1: Tie 1kΩ 5% to VCC |
| Option 2: Tie directly to VCC |
The EQ0/1 Pins affect the receiver EQ setting of the upstream-facing RX1 and RX2 Ports, while the SSEQ0/1 Pins affect the receiver EQ setting of the downstream-facing SSTX Port.
| EQ Setting # | USB 3.2 Downstream Facing Ports | USB 3.2 Upstream Facing Ports | ||||
|---|---|---|---|---|---|---|
| EQ1 | EQ0 | EQ Gain at 2.5GHz (dB) | SSEQ1 | SSEQ0 | EQ Gain at 2.5GHz (dB) | |
| 0 | 0 | 0 | -0.9 | 0 | 0 | -2.4 |
| 1 | 0 | R | 0.2 | 0 | R | -1.3 |
| 2 | 0 | F | 1.2 | 0 | F | -0.4 |
| 3 | 0 | 1 | 2.2 | 0 | 1 | 0.7 |
| 4 | R | 0 | 3.1 | R | 0 | 1.5 |
| 5 | R | R | 4.0 | R | R | 2.5 |
| 6 | R | F | 4.8 | R | F | 3.2 |
| 7 | R | 1 | 5.6 | R | 1 | 4.0 |
| 8 | F | 0 | 6.3 | F | 0 | 4.8 |
| 9 | F | R | 7.0 | F | R | 5.5 |
| 10 | F | F | 7.5 | F | F | 6.0 |
| 11 | F | 1 | 8.1 | F | 1 | 6.6 |
| 12 | 1 | 0 | 8.5 | 1 | 0 | 7.1 |
| 13 | 1 | R | 9.1 | 1 | R | 7.6 |
| 14 | 1 | F | 9.5 | 1 | F | 8.0 |
| 15 | 1 | 1 | 9.9 | 1 | 1 | 8.5 |