TUSB1146 datasheet(29/68 Pages) TI2

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TUSB1146

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Table 9. DisplayPort Receiver (DP[3:0] pins) Equalization Control

DP1EQ_SEL,

DP2EQ_SEL, or DP3EQ_SEL

Equalization Setting #

DPEQ1 PIN LEVEL

DPEQ0 PIN LEVEL

EQ Gain at 4.05 GHz minus

Gain at 100MHz

(dB)

0.8

1.3

2.8

4.1

5.8

6.2

7.1

7.9

8.6

9.2

9.8

10.3

10.7

11.2

11.5

8.4.5 VOD modes

The TUSB1146 provides two modes for VOD (voltage output differential) control: Linearity VOD and Limited

VOD. The TUSB1146 defaults linearity VOD mode but can be changed to limited VOD mode thru I2C register.

8.4.5.1 Linearity VOD

Linearity VOD defines the linearity range of the TUSB1146. When TUSB1146 is in linear VOD mode, the output

VOD is a linear function of the input VID. For example, if the signal at TUSB1146's input (VID) is at 600mVpp

then the TUSB1146's output VOD will be around 600mVpp. The linear VOD mode is the only mode available for

the downstream paths (DisplayPort and USB). The upstream path (USB only) supports both linear and limited

VOD. Linearity VOD mode is the default operation of the TUSB1146. The TUSB1146 provides four different

linearity VOD settings. All four settings are available in I2C mode thru register control.

8.4.5.2 Limited VOD

Limited VOD mode is used to set the actual VOD level and is used when TUSB1146 is configured in limited

redriver mode. In this mode the VOD is no longer a linear function of the input VID. For example, if the signal at

TUSB1146's input (VID) is at 600mVpp then the TUSB1146's output VOD will be around 1000mVpp (assuming

LINR_L3 is selected). The limited redriver mode is only supported in the upstream direction (RX1 -> SSRX and

RX2 -> SSRX). The downstream paths will always operate in linear redriver mode. Limited redriver mode can be

enabled by I2C register. This mode is not supported in GPIO mode. The TUSB1146 provides four different limited

VOD settings. All four settings are available through register control.

8.4.6 Transmit Equalization

The TUSB1146 in limited redriver mode offers both SSRX transmitter pre-shoot and de-emphasis controls. The

TUSB1146 offers four pre-shoot levels and four de-emphasis levels. These levels can be changed by modifying

I2C registers. Pre-shoot is enabled when SSRX_LIMIT_ENABLE bit = 1 and TX_PRESHOOT_EN bit= 1. De-

emphasis is enabled when SSRX_LIMIT_ENABLE bit = 1 and TX_DEEPHASIS_EN = 1.

8.4.7 USB3.1 Modes

The TUSB1146 monitors the physical layer conditions like receiver termination, electrical idle, LFPS, and

SuperSpeed signaling rate to determine the state of the USB3.1 interface. Depending on the state of the USB

3.1 interface, the TUSB1146 can be in one of four primary modes of operation when USB 3.1 is enabled (CTL0 =

H or CTLSEL0 = 1b1): Disconnect, U2/U3, U1, and U0.

TUSB1146 Datasheet(PDF) 29 Page - Texas Instruments

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