TUSB564I datasheet(33/45 Pages) TI1

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SBU1

SBU2

AUXn

AUXp

TUSB564

SBU2

SBU1

AUXP

AUXN

PD Controller

SBU2

SBU1

1M (+/-5%)

AUXP

AUXN

SRC_DET#

SRC_DET

100nF

DP SINK

3.3V

Make AUX connections as short as

possible to minimize stub effects

DP0

DP1

DP2

DP3

TX1

RX1

RX2

TX2

ML0

ML1

ML2

ML3

TUSB564

www.ti.com

SLLSF29A – OCTOBER 2017 – REVISED OCTOBER 2017

Product Folder Links: TUSB564

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9.2.3 Support for DisplayPort UFP_D Pin Assignment E

The TUSB564 device can be used in a system that handles DisplayPort UFP_D Pin Assignment E use-case if

special measures are taken as described below. With UFP_D Pin Assignment E, the polarity of both the main

link and AUX signals is inverted on the Type-C receptacle pins relative to Pin Assignment C. Moreover, on the

Type-C receptacle, the location of Lane 0 is swapped with Lane 1 and that of Lane 2 is swapped with Lane 3

relative to Pin Assignment C. For correct reception of the DisplayPort video signal, the system has to

comprehend the above-described signaling variation.

The use of the TUSB564 device in a system that handles Pin Assignment E depends on whether AUX-to-SBU

switching of the DisplayPort AUX signal is performed internally by the TUSB564 or by external devices such as a

PD controller. It also depends on the configuration mode used: I2C Mode or GPIO Mode. In all those scenarios

the TUSB564 passes the polarity of the Main Link signals as received. The DisplayPort sink has to handle the

polarity inversion of those signals. Moreover, the DisplayPort sink has to handle the lane swapping with the

following lane-to-pin mapping as received by the TUSB564 device: Lane 0

→ DP1, Lane 1 → DP0, Lane 2 →

DP3, and Lane 3

→ DP2.

The use-case with the AUX-to-SBU switching performed internally by the TUSB564 device is shown in Figure 28.

If the TUSB564 device configuration is through the I2C Mode, AUX snooping has to be disabled by setting

AUX_SNOOP_DISABLE register 0x13[7] = 1'b1, and manual AUX-to-SBU switching has to be performed

through the AUX_SBU_OVR register 0x13[5:4]: AUX_SBU_OVR = 2’b01 for normal USB Type-C plug

orientation, or AUX_SBU_OVR = 2’b10 for flipped USB Type-C plug orientation when Pin Assignment E signals

are received. If the TUSB564 device configuration is through the GPIO Mode, all 4 DisplayPort lanes are

automatically activated. The DisplayPort sink device has to handle the polarity inversion of both the AUX and

Main Link signals as well as main link lane swapping.

Figure 28. DisplayPort AUX Connections for UFP_D Pin Assignment E with Internal AUX Switching

TUSB564I датащи(PDF) 33 Page - Texas Instruments

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