USB3300 SMSC Corporation, USB3300 Datasheet - Page 45

• Manufacturer Part Number: USB3300
• Description: Hi-Speed USB Host
• Manufacturer: SMSC Corporation

Hi-Speed USB Host, Device or OTG PHY with ULPI Low Pin Interface
Datasheet
SMSC USB3300
APPLICATION
Standard Host
Peripheral
TYPICAL
Standard
Note 6.1
Note 6.2
A host PHY may use an active high or low fault by setting the IndicatorComplement bit [5] in the
Interface Control register. Also this implementation supports the IndicatorPassThru bit [6] in the
Interface Control register, which allows a choice of having the External Vbus input qualified (and’ed)
w i t h t h e e x t e r n a l v b u s c o m p a r a t o r o u t p u t . To u s e t h e E x t e r n a l V b u s I n p u t t h e
UseExternalVbusIndicator bit [7] must be set in the OTG control register. The default is not to use this
input.
The EXTVBUS pin has a built in pull down resistor that is controlled by the UseExternalVbusIndicator
bit [7] of the OTG control register. When UseExternalVbusIndicator is set to 0 (default) the pull down
resistor is activated to prevent the pin from floating when it is unused. When UseExternalVbusIndicator
is set to 1 the pull down resistor is disconnected.
INDICATOR
EXTERNAL
VBUS
USE
SMSC does not recommend using the ExternalVbus signal qualified with the internal
VbusVld comparator.
A peripheral should not use VbusVld to begin operation. The peripheral should use
SessVld because the internal VbusVld threshold can be above the Vbus voltage required
for USB peripheral operation.
1
1
0
Table 6.10 External Vbus Indicator Logic (continued)
PASS THRU
INDICATOR
1
X
1
DATASHEET
COMPLEMENT
INDICATOR
45
0
1
X
External active high power fault signal
External active low power fault signal
Internal VbusVld comparator. This should
not be used by the Link.
RXCMD VBUS VALID
ENCODING SOURCE
Revision 1.06 (07-19-06)
(Note
6.2)