USB5906 datasheet(21/64 Pages) MICROCHIP

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USB5906

DS00002242E-page 21



2016-2021 Microchip Technology Inc.

3.5

Configuration Straps and Programmable Functions

Configuration straps are multi-function pins that are used during Power-On Reset (POR) or external chip reset

(

RESET_N) to determine the default configuration of a particular feature. The state of the signal is latched following de-

assertion of the reset. Configuration straps are identified by an underlined symbol name. This section details the various

device configuration straps and associated programmable pin functions.

3.5.1

CFG_STRAP CONFIGURATION

The

CFG_STRAP pin is used to place the hub into preset modes of operation. The resistor options are a 200 kΩ pull-

down, 200 kΩ pull-up, 10 kΩ pull-down, 10 kΩ pull-up, 10 Ω pull-down, and 10 Ω pull-up as shown in Table 3-11.

3.5.2

PORT DISABLE CONFIGURATION (

PRT_DIS_P[6:1] / PRT_DIS_M[6:1])

The

PRT_DIS_P[6:1] and PRT_DIS_M[6:1] configuration straps are used in conjunction to disable the related port (6-1).

For

PRT_DIS_Px (where x is the corresponding port 6-1):

0 = Port x D+ Enabled

1 = Port x D+ Disabled

For

PRT_DIS_Mx (where x is the corresponding port 6-1):

0 = Port x D- Enabled

1 = Port x D- Disabled

Note:

The system designer must guarantee that configuration straps meet the timing requirements specified in

Section 10.6.2, Power-On and Configuration Strap Timing and Section 10.6.3, Reset and Configuration

Strap Timing. If configuration straps are not at the correct voltage level prior to being latched, the device

may capture incorrect strap values.

TABLE 3-11: CFG_STRAP RESISTOR ENCODING

CFG_STRAP

Resistor Value

Config

Setting

200 kΩ Pull-Down

CONFIG1

I2C Bridging Mode

The SMBus interface will operate in Master Mode for use with USB to I2C bridg-

ing function. For more information on USB to I2C bridging with the USB5806,

refer to the “USB to I2C Using Microchip USB 3.1 Gen 1 Hubs” application note.

200 kΩ Pull-Up

CONFIG2

SMBus Slave Mode

The SMBus interface will operate in Slave Mode for use with hub configuration.

10 kΩ Pull-Down

CONFIG3

Unused, Reserved

10 kΩ Pull-Up

CONFIG4

Unused, Reserved

10 Ω Pull-Down

CONFIG5

Unused, Reserved

10 Ω Pull-Up

CONFIG6

Unused, Reserved

Note:

Both

PRT_DIS_Px and PRT_DIS_Mx (where x is the corresponding port) must be tied to 3.3 V to disable

the associated downstream port. Disabling the USB 2.0 port will also disable the corresponding USB 3.2

Gen 1 port.

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