Texas Instruments OMAP5912 Reference Manual page 1572

USB OTG Controller
Pin Group 2 USB Host Using 3-Wire USB Transceiver
Figure 70. USB Host Connections on USB Pin Group 2 Using 3-Wire Transceiver
U1
MCSI2.DOUT/USB2.TXEN
UART2.TX/USB2.TXD
UART2.RTS/USB2.SE0
MCSI2.SYNC/USB2.SPEED
MCSI2.CLK/USB2.SUSP
GPIO
OMAP5912
280 Universal Serial Bus (USB)
OE
TXDAT/RCVDAT
TXSE0/RCVSE0
SPEED
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/USB2.TXEN
-
UART2.TX/USB2.TXD
-
UART2.RTS/USB2.SE0
-
MCSI2.SYNC/USB2.SPEED
-
MCSI2.CLK/USB2.SUSPEND
See Table 74.
HMC_MODE must be set to a value that routes a host controller port to USB
pin group 2 (see Table 73). OTG_SYSCON_1.USB2_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/USB2.TXD and UART2.RTS/USB2.SE0.
U2
OE
DAT
SE0 D+
D−
SPEED
SUSPEND
VDD
USB transceiver
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
VBUS
C1
SPRU761A
J1