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DS00002236D-page 19

USB5806

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.

Note:

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

Section 9.6.2, Power-On and Configuration Strap Timing and Section 9.6.3, 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

Speed Indicator Mode + I2C Bridging Mode

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

bridging 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” appli-

cation note.

The following programmable pins will be re-purposed as USB Speed Indicator

outputs:

Pin 63: SPEED_IND1

Pin 61: SPEED_IND2

Pin 56: SPEED_IND3

Pin 60: SPEED_IND4

Pin 50: SPEED_IND5

Pin 71: SPEED_IND6

The SPEED_INDx pins operate in the following manner:

Tri-state: Not connected

0: USB 2.0 / USB 1.1

1: USB 3.1 Gen 1

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