HD3SS2521

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SLAS941A – APRIL 2013 – REVISED MAY 2013

PIN FUNCTIONS (continued)

SIGNAL

DockPort HOST

DockPort DEVICE

SPEED

PIN

I/O

PIN NAME

(SIGNAL MUX)

(SIGNAL DE-MUX)

(MAX)

19

O

HS_SEL_OUT

DisplayPort / High-speed USB Mux Select (Connect to HS_SEL_IN - Pin 12)

This signal in conjunction with SS_SEL_OUT is sampled at power-on or reset to

determine the voltage level supplied to a DockPort host and must be strapped to

correct logic level for the corresponding voltage level: 5 V, 12 V or 19 V.

Refer to the Power Delivery Voltage Selection table for strapping options.

After power-on/reset, this signal is driven by DockPort host to select the device

operation between DisplayPort and High-speed USB.

MM 0 = DisplayPort

MM 1 = High-speed USB

20

O

SS_SEL_OUT

DisplayPort / SuperSpeed USB Mux Select (Connect to SS_SEL_IN - Pin 7)

This signal in conjunction with HS_SEL_OUT is sampled at power-on or reset to

determine the voltage level to be supplied to a DockPort host and must be

strapped to correct logic level for the corresponding voltage level: 5 V, 12 V or

19 V.

Refer to the Power Delivery Voltage Selection table for strapping options.

After power-on/reset, this signal is driven by DockPort host to select the device

operation between DisplayPort and SuperSpeed USB.

MM 0 = DisplayPort

MM 1 = SuperSpeed USB

28

I/O

CONFIG_2

DisplayPort CONFIG2/CEC

29

I/O

CONFIG_1

DisplayPort CONFIG1/CAD

21

O

CHRG_OFF

This signal controls the power delivery

—

circuit.

MST_MODE

—

MST Mode Input from MST HUB

which indicates 2/4 DisplayPort lane

switch.

0 = 2-lane (external 10 k

Ω Pull-down)

1 = 4-lane (external 10 k

Ω Pull-up)

22

O

CHRG_DELAY

This signal controls the power delivery

—

circuit.

CHRG_EN#

—

This signal is the power delivery

enable for a DockPort hub.

23

I

SLEEP#

Connect to the DockPort host sleep state

—

signal.

FAULT#

—

Connect to the fault indicator of the

power management circuit

25

I

SYS_COM_REQ

External 100K Pull–down required. This

signal is a sampled at power on or reset

to determine if the system is in a FW

update mode.

After power on reset, the signal is used

for communication request via a GPIO in

a DockPort host for communication

request

O

VCTRL_SEL1

—

Power enable for 5 V power delivery

In additon, this signal is sampled at

power on or reset to determine the

mode of operation:

0 = DockPort hub (external 10 k

Ω

Pull-down)

1 = DockPort dongle (external 10 k

Ω

Pull-up)

Copyright © 2013, Texas Instruments Incorporated

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