7.3 Feature Description

7.3.1 Receiver Equalization

The purpose of receiver equalization is to compensate for channel insertion loss and inter-symbol interference

in the system before the input of the TUSB522P. The receiver overcomes these losses by attenuating the low

frequency components of the signals with respect to the high frequency components. The proper gain setting

should be selected to match the channel insertion loss before the input of the TUSB522P receivers. The gain

setting may differ for channel 1 and channel 2.

7.3.2 De-Emphasis Control and Output Swing

The differential driver output provides selectable de-emphasis and output swing control in order to achieve

USB3.1 compliance. The TUSB522P offers a unique way to adjust output de-emphasis and transmitter swing

based on the OS1/2 and DE1/2 pins. The level of de-emphasis required in the system depends on the channel

length after the output of the re-driver. The output swing and de-emphasis levels may differ for channel 1 and

channel 2.

Figure 7-1. Transmitter Differential Voltage, OS = Floating

7.3.3 Automatic LFPS Detection

The TUSB522P features an intelligent low frequency periodic signaling (LFPS) controller. The controller senses

the low frequency signals and automatically disables the driver de-emphasis, for full USB3.1 compliance.

TUSB522P

SLLSEV9E – JULY 2016 – REVISED NOVEMBER 2023

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