ZHCST15 September 2023 TUSB211A
PRODUCTION DATA
The ideal EQ setting is dependent upon the signal chain loss characteristics of the target platform. The recommendation is to start with EQ Level 0, and then increment to EQ Level 1, and so on.
For the TUSB211A to recognize any change to the EQ setting, the RSTN pin must be toggled. This is because the EQ pin is latched on power up and the pin is ignored thereafter.
Placement of the device is also dependent on the application goal. Table 8-2 describes TI recommendations.
| PLATFORM GOAL | SUGGESTED TUSB211A PLACEMENT |
|---|---|
| Pass USB Near End Mask at the receptacle | Close to measurement point (connector) |
| Pass USB Far End Eye Mask at the plug | Close to USB PHY |
| Cascade multiple TUSB211As to improve device enumeration | Midway between each USB interconnect |
| EQ settings(1) for channel loss | |
|---|---|
| Pre-channel cable length (Between USB PHY and TUSB211A) | EQ |
| 0-3 meter | Level 0 |
| 2-5 meter | Level 1 |
| Post-channel cable length (Between TUSB211A and inter-connect) | EQ |
| 0-2 meter | Level 0 |
| 1-4 meter | Level 1 |