TX Eye Amplitude Tuning

The PHY allows for TX tuning to improve signal integrity and to account for per-board insertion loss.
Table 1. PHY Register TX Amplitude Tuning
PHY Register Name Address Description
drvctrl_boost_preg[15:0] Lane0: 0x20406F
Lane1: 0x20426F
Lane2: 0x20446F
Lane3: 0x20466F
 [1:0]
Edge boost selection:
Value Boost Level
2'b00 Minimum boost
: :
2'b11 Maximum boost
[10:8]
Amplitude boost selection:
Value Boost Level
3'b000 Minimum boost
: :
3'b111 Maximum boost
[15]
Amplitude boost active high enable. Pair with [10:8]
det_standec_a_preg[15:0] Lane0: 0x204000
Lane1: 0x204200
Lane2: 0x204400
Lane3: 0x204600
 [12]
Active high enable for the transmit driver edgeboost. Pair with drvctrl_boost_preg[1:0] above
Note: Any change in value impacts the value of the PMA TX full swing (FS). You should adjust the TX de-emphasis value to optimize the TX eye quality.