7.3.4 Receiver Linear Equalization

The purpose of receiver equalization is to compensate for channel insertion loss and inter-symbol interference in the system. 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. Two 4-level input pins enable up to 16 possible equalization settings. The upstream path, and the downstream path each have their own two 4-level inputs for equalization settings; UEQ[1:0] and DEQ[1:0] respectively. The TUSB544 also provides the flexibility of adjusting equalization settings through I²C registers URX[2:1]EQ_SEL, UTX[2:1]EQ_SEL, DRX[2:1]EQ_SEL, and DTX[2:1]EQ_SEL for each individual channel and for each direction (upstream or downstream) .