TUSB1146 datasheet(32/68 Pages) TI2

32 / 68 page

USB-Only

USB +

2-Lane DP

Disabled

4-lane DP

Power-On

Reset

Exit Alt

Mode

Exit Alt Mode

or Unattached

state

Enter Alt

Mode

Enter Alt

Mode

Exit Alt Mode

or Unattached

state

TUSB1146

SLLSFB2 – APRIL 2020

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8.5 Programming

8.5.1 Transition between Modes

The TUSB1146 allows for transitioning between any mode (USB-only to 4DP, 4DP to USB+2DP, and so forth).

The USB-C standard requires transitioning to the USB Safe State before entering to or exiting from an Alternate

Mode. The USB Safe State defines an electrical state for the SBU1/2 and SSTX/SSRX for DFPs, UFPs, and

Active Cables when transitioning between USB and an Alternate Mode. Therefore before entering to or exiting

from four lane DP mode it is recommended to first enter the Disable state (CTLSEL = 2'b00 or (CTL0 pin = 0 and

CTL1 pin = 0)).

Figure 28. Recommended Mode Transitions

8.5.2 Pseudocode Examples

8.5.2.1 Fast AEQ with linear redriver mode

// (address, data)

// Initial power-on configuration.

(0x0A, 0x11), // EQ_OVERRIDE and USB3.1 default.

(0x1C, 0x81), // Fast AEQ enable

(0x10, 0x55), // DP lanes 0 and 1 EQ

(0x11, 0x55), // DP lanes 2 and 2 EQ

(0x1D, 0x10), // FASTAEQ_LIMITS to 80mV

(0x1E, 0x55), // USB-C Rx1/Rx2 Long channel EQ.

(0x20, 0x00), // USB-C Rx1/Rx2 Short channel EQ.

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