Texas Instruments OMAP5912 Reference Manual page 1576

USB OTG Controller
Figure 73. USB Host Connections on USB Alternate Pin Group 2 Using 3-Wire
Transceiver
U1
MCSI2.DOUT/USB0.TXEN
UART2.TX/USB0.TXD
UART2.RTS/USB0.SE0
MCSI2.SYNC/USB0.SPEED
MCSI2.CLK/USB0.SUSP
GPIO
OMAP5912
284 Universal Serial Bus (USB)
OE
OE
TXDAT/RCVDAT
DAT
TXSE0/RCVSE0
SE0
SPEED
SPEED
SUSPEND
SUSPEND
VBUS_ENABLE
OVERCURRENT
R1, R2
R3, R4
C1
U1
U2
U3
U4
J1
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
-
MCSI2.SYNC/USB0.SPEED
-
MCSI2.CLK/USB0.SUSP
See Table 74.
HMC_MODE must be set to a value that routes a host controller port to USB
pin group 0 (see Table 73). OTG_SYSCON_1.USB0_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
D+
D−
VDD
USB transceiver
VBUS
CONTROL
Value depends on transceiver
15K Ohm 5%
Low ESR cap, minimum 120 uF
OMAP5912
USB transceiver
Transient suppressor, like SN65220, SN65240, or SN75240
Power switch, like TPS2014 or TPS2015
USB type-A receptacle
R1
Transient
U3
suppressor
R2
R3
R4
VBUS
U4
C1
SPRU761A
J1