USB 2.0 Hi-Speed 3-Port Hub Controller Optimized for Portable Applications
Datasheet
Table 7.11 Configure Portable Hub Register
CFGP
PORTABLE HUB CONFIGURATION REGISTER
DESCRIPTION
(0x30EE - RESET= 0x10)
BIT
NAME
R/W
7
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.)
6
IntSusp
R/W
0: INT_N pin function retains event sensitive role of a general serial port
interrupt.
1: INT_N pin function is a level sensitive USB suspend interrupt indication.
Allows system to adjust current consumption to comply with USB
specification limits when hub is in the USB suspend state.
Note:
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
0
Reserved
R
Always read ‘0’
Table 7.12 Port Select and Low-Power Suspend Register
PORT SELECT AND LOW POWER SUSPEND REGISTER
DESCRIPTION
PSELSUSP
(0x318B- RESET=0x00)
BIT
7:6
NAME
R/W
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
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 USB3813
43
Revision 1.0 (06-17-13)
DATASHEET
SMSC [ SMSC CORPORATION ]
