Public Version
High-Speed USB Host Subsystem
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When a USB transceiver is connected to the device and used in 6-pin unidirectional DP/DM encoding
mode, the encoding described in
is used.
Table 22-27. Signaling Between High-Speed USB Host Subsystem and 6-Pin Unidirectional USB
Transceiver (DP/DM Signaling)
Logical Signal Name
Device Pin
Transceiver Pin
Description
Direction
Direction
TXEN
Output
Input
When low, the USB transceiver drives D+ and D–.
DAT and SE0
Output
Input
Controls the values output by the USB transceiver on D+ and D–
when TXEN is low/high; ignored when TXEN is high/low (depending
on the TXEN signal polarity; see the CONTROL.
[2, 1 and/or 0]
MM_FSUSBi_TXEN_N_OUT_POLARITY_CTRL bit).
TXEN
DAT
SE0
D+
D–
0
0
1
0
1
0
1
0
1
0
0
0
0
0
0
1
X
X
Undriven
Undriven
RCV
Input
Output
Output from transceiver differential receiver
D+
D–
RCV
0
0
X
0
1
0
1
0
1
1
1
X
DP
Input
Output
Output from transceiver single-ended D+ signal receiver
D+
DP
0
0
1
1
DM
Input
Output
Output from transceiver single-ended D– signal receiver
D–
DM
0
0
1
1
22.2.2.4.1.2 Bidirectional
When a USB or USB OTG transceiver is connected to the device and is used in 3-pin bidirectional
DAT/SE0 encoding mode, the encoding described in
is used.
Table 22-28. Signaling Between High-Speed USB Host Subsystem and 3-Pin Bidirectional USB
Transceiver Using DAT/SE0 Signaling
Logical Signal
Device Pin
Transceiver Pin
Description
Name
Direction
Direction
TXEN
Output
Input
When low, the USB transceiver drives D+ and D–.
3248High-Speed USB Host Subsystem and High-Speed USB OTG Controller
SWPU177N – December 2009 – Revised November 2010
Copyright © 2009–2010, Texas Instruments Incorporated
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