usb-018
Device
USB transceiver
6-pin unidirectional
(Tx=DAT/SE0)
mmx_txdat
mmx_txse0
RxRCV
RxDM
RxDP
TxEN
TxSE0
TxDAT
mmx_rxrcv
mmx_rxdp
mmx_txen_n
mmx_rxdm
D+
D-
x is the USB port number (1, 2 or 3)
usb-019
Device
USB transceiver
6-pin unidirectional
(Tx=DP/DM)
RxRCV
RxDM
RxDP
TxEN
TxDM
TxDP
D+
D-
mmx_txdat
mmx_txse0
mmx_rxrcv
mmx_rxdp
mmx_txen_n
mmx_rxdm
x is the USB port number (1, 2 or 3)
Public Version
High-Speed USB Host Subsystem
www.ti.com
Figure 22-20. 6-Pin Unidirectional Using DAT/SE0 Signaling
When a USB is connected to the device and used in 6-pin unidirectional DP/DM signaling mode, the
signaling described in
is used.
shows a USB port using DP/DM encoding.
Figure 22-21. 6-Pin Unidirectional Using DP/DM Signaling
22.2.2.4.3.2 Bidirectional Transceiver Interface Modes: 3-Pin, 4-Pin
The bidirectional transceiver interface modes are pin-count optimizations of the unidirectional modes. They
take advantage of the fact that a USB port is either sending or receiving at any given time, but never both.
The TX and RX paths of the unidirectional mode can be multiplexed on bidirectional lines. To prevent
glitches at TX/RX turnaround, the same encoding is used for both directions (DAT/SE0 or DP/DM).
The signaling listed in
is used when a USB transceiver is connected to the device and is used
in 3-pin bidirectional DAT/SE0 signaling mode.
3252
High-Speed USB Host Subsystem and High-Speed USB OTG Controller
SWPU177N – December 2009 – Revised November 2010
Copyright © 2009–2010, Texas Instruments Incorporated