ZHCSG75E April 2017 – April 2018 TUSB544
PRODUCTION DATA.
The TUSB544 supports up to 4 DisplayPort lanes at data rates up to 8.1Gbps (HBR3). The TUSB544, when configured in DisplayPort mode, monitors the native AUX traffic as it traverses between DisplayPort source and DisplayPort sink. For the purposes of reducing power, the TUSB544 will manage the number of active DisplayPort lanes based on the content of the AUX transactions. The TUSB544 snoops native AUX writes to DisplayPort sink’s DPCD registers 00101h (LANE_COUNT_SET) and 00600h (SET_POWER_STATE). TUSB544 will disable/enable lanes based on value written to LANE_COUNT_SET. The TUSB544 will disable all lanes when SET_POWER_STATE is in the D3. Otherwise active lanes will be based on value of LANE_COUNT_SET.
DisplayPort AUX snooping is enabled by default but can be disabled by changing the AUX_SNOOP_DISABLE register. Once AUX snoop is disabled, management of TUSB544’s DisplayPort lanes are controlled through various configuration registers.