USB3503 Datasheet, PDF (39/82 Pages) SMSC Corporation – USB 2.0 HSIC High-Speed Hub Controller Optimized for Portable Applications

USB 2.0 HSIC High-Speed Hub Controller Optimized for Portable Applications
Datasheet
5.3.32
Register EEh: Configure Portable Hub - CFGP
Default = 0x00h - Corresponds to 95ms startup & Phone RefClks available
BIT NUMBER
7
6
5:4
3
BIT NAME
ClkSusp
IntSusp
DESCRIPTION
(Read/Write)
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 serial port during USB session.)
0 = Allow device to gate off its internal clocks during suspend mode in order to
meet USB suspend current requirements.
(Read/Write)
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.
0 = INT_N pin function retains event sensitive role of a general serial port
interrupt.
See Section 3.3.4, "Interrupt," on page 18 for more information.
CfgTout
(Read Only)
Specifies timeout value for allowing SOC to configure the device. Corresponds
to the T_hubconfig parameter. See Section Table 4.2, "Timing Parameters for Hub
Stages".
‘00’ = 95ms - Use to meet legacy 100ms connect timing
Reserved Reserved
2:0
Reserved Reserved
5.3.33 Register F4h: Varisense_UP3 - VSNSUP3
Default = 0x00h
BIT NUMBER
7:3
2:0
BIT NAME
DESCRIPTION
Reserved Reserved
DN3_SQUELCH These two bits control the Squelch setting of the downstream port 3.
‘000’ = Nominal value
‘001’ = 90% of Nominal value
‘010’ = 80% of Nominal value
‘011’ = 70% of Nominal value
‘100’ = 60% of Nominal value
‘101’ = 50% of Nominal value
‘110’ = 120% of Nominal value
‘111’ = 110% of Nominal value
SMSC USB3503A
39
DATASHEET
Revision 1.1 (02-07-13)