SLLSFB2 April 2020 TUSB1146
PRODUCTION DATA.
The TUSB1146 implements an adaptive equalizer (AEQ) function for the USB-C downstream facing port receivers (RX1 and RX2). The purpose of the adaptive equalizer function is determine the best EQ value such that output jitter is minimized. The TUSB1146 provides two modes of adaptive equalization: Fast AEQ and Full AEQ. The selection between Fast and Full AEQ is determined by a register. The AEQ feature is disabled by default but can enabled through a register. The Fast adaptive equalization feature is supported in GPIO mode when I2C_EN pin = "F" and !(EQ0 pin = "0" and EQ1 = "0").
NOTE
The AEQ feature is NOT supported on SSTX receiver and the DP[3:0] receivers. These receivers only support fixed EQ.
Fast AEQ is not supported in the GPIO defined by I2C_EN = "0". It is recommended to configure TUSB1146 for I2C mode when using adaptive EQ features as this provides the most flexibility.