GPIO4 datasheet(37/60 Pages) MICROCHIP

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DS00002236D-page 37

USB5806

8.8.2.1

Enabling Port Splitting

In order to enable the Port Splitting feature on downstream ports 5 and/or6, the following configuration settings must be

made.

Enabling Port Splitting on Port 5:

• Write 0x42 to register 0x416E to select GPIO66 for Option A

• Write 0x05 to register 0x416E to select GPIO5 for Option B

• Set bit 5 of the USB3_PORT_SPLIT_EN (0x3C48 = 0x20)

Enabling Port Splitting on Port 6:

• Write 0x06 to register 0x416F to select GPIO6 for Option A

• Write 0x04 to register 0x416F to select GPIO4 for Option B

• Set bit 6 of the USB3_PORT_SPLIT_EN (0x3C48 = 0x40)

8.8.2.2

Link Timeout Reset

Port Splitting is intended for use with embedded USB 3.x devices only. When Port Splitting is enabled, the hub constantly

monitors the USB 3.1 Gen 1 Link to see if a valid USB 3.1 Gen 1 Link is established. If there is no valid USB 3.1 Gen 1

Link for a configured amount of time (see below), then the hub will toggle assertion of the associated “PRTPWRx-

_USB3_SPLIT” pin in an attempt to reset the embedded USB 3.1 Gen 1 device and re-establish the USB 3.1 Gen 1 Link.

The timer is always reset and restarted whenever the timeout occurs.

TABLE 8-5:

PORT SPLIT PRTPWRX_USB3_SPLIT PIN ASSIGNMENT

GPIOx Pin

Port Split Assignment

GPIO66

PRTPWR5_USB3_SPLIT Option A

GPIO6

PRTPWR6_USB3_SPLIT Option A

GPIO5

PRTPWR5_USB3_SPLIT Option B

GPIO4

PRTPWR6_USB3_SPLIT Option B

TABLE 8-6:

USB 3.0 PORT SPLIT ENABLE REGISTER

USB3_PORT_SPLIT_EN

(0x3C48 - RESET = 0x00)

USB 3.0 Port Split Enable

BIT

Name

R/W

Description

7:1

PORT_SPLIT_EN[7:1]

R/W

0 = Port Splitting on the specified port is disabled

1 = Port Splitting on the specified port is enabled

Bit

[1] - Reserved

[2] - Reserved

[3] - Reserved

[4] - Reserved

[5] - Port 5

[6] - Port 6

[7] - Reserved

Reserved

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