USB3320C-EZK Standard Microsystems (SMSC), USB3320C-EZK Datasheet - Page 35

• Manufacturer Part Number: USB3320C-EZK
• Description: USB PHY
• Manufacturer: Standard Microsystems (SMSC)

Specifications of USB3320C-EZK

• Lead Free Status / RoHS Status: Compliant

Highly Integrated Full Featured Hi-Speed USB 2.0 ULPI Transceiver
Datasheet
SMSC USB3320
5.6.1.3
Note: IdPullUp = 0
The Rid resistance can be read while the USB3320 is in Synchronous Mode. When a resistor to
ground is attached to the ID pin, the state of the IdGnd comparator will change. After the Link has
detected ID transition to ground, it can use the methods described in
converter.
Using IdFloat Comparator
Note: The ULPI specification details a method to detect a 102kΩ resistance to ground using the
The ID pin can be either grounded, floated, or connected to ground with a 102kΩ external resistor. To
detect the 102K resistor, set the idPullup bit in the
the 100K internal pull-up connected between the ID pin and VDD33. Set the idFloatRise and idFloatFall
bits in both the
IdFloat comparator to generate an RXCMD to the Link when the state of the IdFloat changes. As
described in
shown for the three types cables that can attach to the USB Connector in
Note: The ULPI register bits IdPullUp, IdFloatRise, and IdFloatFall should be enabled.
To save current when an A Plug is inserted, the internal 102kΩ pull-up resistor can be disabled by
clearing the IdPullUp bit in the
the
the weak R
The IdGnd value can be read using the ULPI
be set to generate an interrupt when IdGnd changes by setting the appropriate bits in the
Enable Rising
the ULPI
USB Interrupt Enable Rising
ID RESISTANCE
IdFloat comparator. This method can only detect 0ohms, 102kΩ, and floating terminations of
the ID pin. Due to this limitation it is recommended to use the RID Converter as described in
Section
ID RESISTANCE TO GROUND
Carkit Interrupt Status
102K
Float
GND
IDW
Figure
Table 5.5 IdGnd and IdFloat vs. ID Resistance to Ground
and
5.6.1.2.
USB Interrupt Enable Rising
will pull the ID pin high.
Table 5.4 Valid Values of ID Resistance to Ground
102kΩ +/-1%
440kΩ +/-1%
200kΩ+/-1%
75Ω +/-1%
USB Interrupt Enable Falling
6.3, the alt_int bit of the RXCMD will be set. The values of IdGnd and IdFloat are
Floating
Ground
OTG Control
register bit 0.
and
DATASHEET
USB Interrupt Enable Falling
35
and
register and the IdFloatRise and IdFloatFall bits in both
USB Interrupt Status
registers. The IdFloat value can be read by reading
USB Interrupt Enable Falling
OTG Control
IDGND
1
1
0
register, causing the USB3320 to apply
register, bit 4. In host mode, it can
registers. If the cable is removed
Section 6.6
Table
RID VALUE
registers to enable the
IDFLOAT
000
001
010
100
101
011
5.5.
Revision 1.0 (07-14-09)
to operate the Rid
1
0
0
USB Interrupt