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Revision 0.6
OMAP TM 4 PandaBoard System
Reference Manual
November 29, 2010
DOC-21010
OMAP4430
DP
3
IO
USBA0_OTG_DP/GPIO_179
Mini-AB
(J18)
DM
VBUS
ID
2
1
4
F1
IO
USBA0_OTG_DM/GPIO_180
GND
5
TWL6030
J15
P
IO
VBUS
ID
DC Input Jack
(P3)
TPS2141
I
SW_IN
SW_OUT
3
DC_5V
NUSB_PWR
R150
EN_VBUSPWRn
I
SW_EN
Figure 15 – Panda USBOTG Interface Block Diagram
2.15.2 USBB1 Phy Interface
The PandaBoard uses the 12-wire OMAP4430 USBB1 ULPI interface connected to an SMSC
USB3320C-EZK phy. This Phy converts the 12-wire ULPI interface to a DP/DM pair that is used as the
upstream USB interface to the LAN9514 USB/Ethernet Hub IC. The Hub IC provides four downstream
Host USB ports, and an Ethernet interface. Two of the USB Host Ports are available via the combo
connector J9, while the other two ports are available via Expansion Connector J6. The Ethernet interface
is available via a tab-up RJ-45 connector at J9. See Figure 16 for a block diagram of the PandaBoard
USBB1 interface connectivity.
? Note that the reference clock to the USB3320C is sourced from the FREF_CLK3_OUT output
of OMAP4430, and this OMAP output must be programmed for a clock frequency of 19.2 MHz
for proper operation
Page 40 of 82
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