USB2533 datasheet(39/61 Pages) SMSC

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USB 2.0 Hi-Speed 3-Port Hub Controller

Datasheet

SMSC USB2533

Revision 1.0 (06-17-13)

DATASHEET

Table 7.9 Configure Portable Hub Register

Table 7.10 Port Select and Low-Power Suspend Register

Note:

This register should be assigned during the Hub.Config or Hub.Connect stages, and should not be

dynamically updated during Hub.Communication stage or undefined behavior may result.

CFGP

(0x30EE - RESET= 0x10)

PORTABLE HUB CONFIGURATION REGISTER

BIT

NAME

R/W

DESCRIPTION

ClkSusp

R/W

0: Allow device to gate-off its internal clocks during suspend mode in order

to meet USB suspend current requirements.

1: Force device to run internal clock even during USB suspend (will cause

device to violate USB suspend current limit - intended for test or self-

powered applications which require use of SMBus during USB session.)

Reserved

Always read ‘0’

5:1

DIS_CHP_PHY_CL

K[5:1]

R/W

A ‘1’ disables the PHY clock of the corresponding port:

Bit 5 - Downstream port 5

Bit 4 - Downstream port 4

Bit 3 - Downstream port 3

Bit 2 - Downstream port 2

Bit 1 - Downstream port 1

Reserved

Always read ‘0’

PSELSUSP

(0x318B- RESET=0x00)

PORT SELECT AND LOW POWER SUSPEND REGISTER

BIT

NAME

R/W

DESCRIPTION

7:6

APortSel

R/W

Specifies which downstream USB port is associated with the

PRTPWRA pin function.

‘00’ - Port 1

‘01’ - Port 2

‘10’ - Port 3

‘11’ - Port 4

5:0

Reserved

Always read ‘0’

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