TUSB546AI-DCI datasheet(20/49 Pages) TI1

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TUSB546A-DCI

SLLSF14 – JUNE 2017

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8.4.4 Linear EQ Configuration

Each of the TUSB546A-DCI receiver lanes has individual controls for receiver equalization. The receiver

equalization gain value can be controlled either through I2C registers or through GPIOs. Table 7 details the gain

value for each available combination when TUSB546A-DCI is in GPIO mode. These same options are also

available in I2C mode by updating registers DP0EQ_SEL, DP1EQ_SEL, DP2EQ_SEL, DP3EQ_SEL, EQ1_SEL,

EQ2_SEL, and SSEQ_SEL.

Table 7. TUSB546A-DCI Receiver Equalization GPIO Control

Equalization

Setting #

USB3.1 DOWNSTREAM FACING PORTS

USB 3.1 UPSTREAM FACING PORT

ALL DISPLAYPORT LANES

EQ1 PIN

LEVEL

EQ0 PIN LEVEL

EQ GAIN at

2.5 GHz

(dB)

SSEQ1 PIN

LEVEL

SSEQ0 PIN

LEVEL

EQ GAIN at 2.5

GHz (dB)

DPEQ1 PIN

LEVEL

DPEQ0 PIN

LEVEL

EQ GAIN at

4.05 GHz (dB)

0.2

-1.6

1.0

1.2

-0.5

3.3

2.2

0.5

4.9

3.3

1.6

6.5

4.2

2.4

7.5

5.1

3.4

8.6

5.9

4.1

9.5

6.7

4.9

10.4

7.4

5.7

11.1

8.1

6.4

11.7

8.7

6.9

12.3

9.3

7.5

12.8

9.7

8.0

13.2

10.2

8.5

13.6

10.6

8.9

14.0

11.1

9.4

14.4

8.4.5 USB3.1 Modes

The TUSB546A-DCI 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 TUSB546A-DCI 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.

The Disconnect mode is the state in which TUSB546A-DCI has not detected far-end termination on both

upstream facing port (UFP) or downstream facing port (DFP). The disconnect mode is the lowest power mode of

each of the four modes. The TUSB546A-DCI remains in this mode until far-end receiver termination has been

detected on both UFP and DFP. The TUSB546A-DCI immediately exits this mode and enter U0 once far-end

termination is detected.

Once in U0 mode, the TUSB546A-DCI will redrive all traffic received on UFP and DFP. U0 is the highest power

mode of all USB3.1 modes. The TUSB546A-DCI remains in U0 mode until electrical idle occurs on both UFP and

DFP. Upon detecting electrical idle, the TUSB546A-DCI immediately transitions to U1.

The U1 mode is the intermediate mode between U0 mode and U2/U3 mode. In U1 mode, the TUSB546A-DCI

UFP and DFP receiver termination remains enabled. The UFP and DFP transmitter DC common mode is

maintained. The power consumption in U1 is similar to power consumption of U0.

Next to the disconnect mode, the U2/U3 mode is next lowest power state. While in this mode, the TUSB546A-

DCI periodically performs far-end receiver detection. Anytime the far-end receiver termination is not detected on

either UFP or DFP, the TUSB546A-DCI leaves the U2/U3 mode and transitions to the Disconnect mode. It also

monitors for a valid LFPS. Upon detection of a valid LFPS, the TUSB546A-DCI immediately transitions to the U0

mode. In U2/U3 mode, the TUSB546A-DCI receiver terminations remain enabled but the TX DC common mode

voltage is not maintained.

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