Texas Instruments OMAP5912 Reference Manual page 1563

OTG on Alternate Pin Group 2 Using 3-Wire OTG Transceiver
Figure 63. OTG on USB Alternate Pin Group 2 Using 3-Wire OTG Transceiver
U1
MCSI2.DOUT/USB0.TXEN
UART2.TX/USB0.TXD
UART2.RTS/USB0.SE0
I2C.SCL
I2C.SDA
OMAP5912
SPRU761A
OE
TXDAT/RCVDAT
TXSE0/RCVSE0
OTGIRQ
GPIOX
SCL
SDA
Proper initialization of the OMAP5912 device to support this mode of operation
requires proper setting of the top-level pin multiplexing for these pins:
-
MCSI2.DOUT/USB0.TXEN
-
UART2.TX/USB0.TXD
-
UART2.RTS/USB0.SE0
See Table 74.
HMC_MODE must be set to a value that provides OTG functionality on USB
alternate pin group 2 (see Table 73). OTG_SYSCON_1_TRX_MODE must be
set to 2 to allow proper bidirectional operation of the 3-wire USB transceiver.
OTG_SYSCON_2.USBx_SYNCHRO must be set to allow proper bidirectional
signaling on pins UART2.TX/USB0.TXD and UART2.RTS/USB0.SE0.
U2
OE
DAT
D+
SE0
D−
ID
VBUS
INT
VDD
SCL
SDA
USB OTG transceiver
R1, R2 Value depends on transceiver
C1
VBUS capacitance must meet OTG spec C DRD_VBUS
U1
OMAP5912
U2
USB OTG transceiver
U3
Transient suppressor, like SN65220, SN65240, or SN75240
USB mini-AB receptacle
J1
Universal Serial Bus (USB)
USB OTG Controller
R1
Transient
U3
suppressor
R2
C1
J1
271