USB4604 datasheet(47/71 Pages) SMSC

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USB 2.0 HSIC Hi-Speed 4-Port Hub Controller

Datasheet

SMSC USB4604

Revision 1.0 (06-17-13)

DATASHEET

Table 7.11 Connect Configuration Register

CONNECT_CFG

(0x318E- RESET=0x00)

CONNECT CONFIGURATION REGISTER

BIT

NAME

R/W

DESCRIPTION

7:2

Reserved

EN_FLEX_MODE

R/W

Flex Connect mode enable

0: Flex Connect mode is disabled. (Normal hub operation with separate

port power and OCS control)

1: Flex Connect mode is enabled

FLEXCONNECT

R/W

FlexConnect Control. When asserted the device changes its hub

connections so that the Swap port (Physical Port 1) changes from it’s

default behavior of a downstream port to an upstream port. The Flex

Port (Physical port 0) transitions from an upstream port to a

downstream port.

‘0’ -

Flex Port = Upstream (Port 0)

Swap Port= Downstream (Port 1)

‘1’ -

Flex Port= Downstream (Port 1)

Swap Port= Upstream (Port 0)

This setting can be used to select whether the Flex Port is an upstream

or downstream port. The Flex Port provides both an HSIC and D+/D-

connection, so the OEM can select whether this flexibility is provided

on the upstream or downstream port.

Another application for this setting is to allow a dual-role device on the

Swap Port to assume a host role and communicate directly with other

downstream hub ports, or to communicate through the Flex Port to a

exposed connector to an external device.

If a “private” communication channel is desired between embedded

devices, any externally exposed ports should be disabled.

Note: All port-specific settings such as VSNS, prtSp, sDiscon are

specific to the logic port 0, 1, 2, 3. When FLEXCONNECT is asserted,

these settings affect the newly assigned physical pins and PHY. Any

settings which are specific to the physical Flex Port and Swap Port

such as battery charger detection do not change with the setting of

FLEXCONNECT.

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