USB 2.0 Hi-Speed 3-Port Hub Controller
Datasheet
Table 7.9 Configure Portable Hub Register
CFGP
(0x30EE - RESET= 0x10)
BIT
7
NAME
ClkSusp
R/W
R/W
PORTABLE HUB CONFIGURATION REGISTER
DESCRIPTION
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.)
6
5:1
Reserved
DIS_CHP_PHY_CL
K[5:1]
R
R/W
Always read ‘0’
A ‘1’
Bit 5
Bit 4
Bit 3
Bit 2
Bit 1
disables the PHY clock of the corresponding port:
- Downstream port 5
- Downstream port 4
- Downstream port 3
- Downstream port 2
- Downstream port 1
0
Reserved
R
Always read ‘0’
Table 7.10 Port Select and Low-Power Suspend Register
PSELSUSP
(0x318B- RESET=0x00)
BIT
7:6
NAME
APortSel
R/W
R/W
PORT SELECT AND LOW POWER SUSPEND REGISTER
DESCRIPTION
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
Note:
Reserved
R
Always read ‘0’
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.
SMSC USB2533
39
Revision 1.0 (06-17-13)
DATASHEET
SMSC [ SMSC CORPORATION ]
