Optional host repeater auto-resume is supported by the TUSB2E11 in L1/L2 by driving Resume K at D+/D- until SOResume is received from eDSPr. In addition, the TUSB2E11 eUSPh holds the Remote Wake line state until SORresume is received from eDSPr.

This auto-resume feature provides host controller extra time to exit low power state and issue SOResume while the TUSB2E11 UDSP drives resume within 1 ms (TURSM) hub resume timing requirement. To take advantage of this low power feature, host controller shall implement low power mechanism to detect wake on eDSPr lines while host controller is in low power state.

This auto-resume is not needed if host controller is capable of initiating SOResume within 1 ms of detecting Remote Wake on eDSPr.

This auto-resume is enabled by default but can be disabled via bit 6 of register 0x78. This auto-resume ECR mode is disabled when L2 interrupt mode is enabled. When L2 interrupt mode is enabled, resume K at D+/D- is still driven when Remote wake is detected on UDSP but eUSPh is held at SE0 instead of in Remote Wake state. See the L2 State Interrupt Modes section for more details.

Figure 8-1 Timing Diagram for Auto-Resume for HS/FS