Texas Instruments OMAP5912 Reference Manual page 1554

USB OTG Controller
USB Transceiver 3-Wire Bidirectional Signaling
Table 77. Signaling Between USB Controller and 3-Wire Bidirectional USB Transceiver
Using TXDAT/TXSE0 Signaling
Logical OMAP5912
Signal Name Pin Direction
OE Output
TXDAT/
RCVDAT and
TXSE0/
RCVSE0
Output
Input
SPEED Output
SUSPEND Output
262 Universal Serial Bus (USB)
When a USB or USB OTG transceiver is connected to OMAP5912 and is used
in 3-wire bidirectional TXDAT/TXSE0 signaling mode, the signaling shown in
Table 77 is used.
Transceiver
Pin Direction
Input
Input
Output
Input
Input
OMAP5912 does not support 3-wire bidirectional signaling using VP/VM
signals.
Description
When low, USB transceiver drives D+ and D-.
When OE is low, OMAP5912 drives TXDAT and TXSE0
and the transceiver drives D+ and D- based on the values
of TXDAT and TXSE0.
OEn TXDAT TXSE0
0 0 0
1 0
X 1
OEn D+ D-
1 0 0
0 1
1 0
1 1
Determines transceiver D+, D- output characteristics.
0 = Low speed
1 = Full speed
2
Transceivers with I C interfaces can implement this
functionality as a control bit rather than a pin.
Controls transceiver powerdown modes.
0 = Active mode
1 = Low-power mode
2
Transceivers with I C interfaces can implement this
functionality as a control bit rather than a pin.
D+ D-
0 1
1 0
0 0
RCVDAT RCVSE0
0 1
0 0
1 0
Undefined Undefined
SPRU761A