IMX51 Datasheet, PDF (128/184 Pages) Freescale Semiconductor, Inc – i.MX51 Applications Processors for Consumer and Industrial Products

Electrical Characteristics
3.7.16 UART
Table 93 shows the UART I/O configuration based on which mode is enabled.
Table 93. UART I/O Configuration vs. Mode
Port
RTS
CTS
DTR
DSR
DCD
RI
TXD_MUX
RXD_MUX
DTE Mode
Direction
Description
Output RTS from DTE to DCE
Input CTS from DCE to DTE
Output DTR from DTE to DCE
Input DSR from DCE to DTE
Input DCD from DCE to DTE
Input RING from DCE to DTE
Input Serial data from DCE to DTE
Output Serial data from DTE to DCE
DCE Mode
Direction
Description
Input RTS from DTE to DCE
Output CTS from DCE to DTE
Input DTR from DTE to DCE
Output DSR from DCE to DTE
Output DCD from DCE to DTE
Output RING from DCE to DTE
Output Serial data from DCE to DTE
Input Serial data from DTE to DCE
3.7.17 USBOH3 Parameters
This section describes the electrical parameters of the USB OTG port and USB HOST ports. For on-chip
USB PHY parameters see Section 3.7.19, “USB PHY Parameters.”
3.7.17.1 USB Serial Interface
In order to support four serial different interfaces, the USB serial transceiver can be configured to operate
in one of four modes:
• DAT_SE0 bidirectional, 3-wire mode
• DAT_SE0 unidirectional, 6-wire mode
• VP_VM bidirectional, 4-wire mode
• VP_VM unidirectional, 6-wire mode
The USB controller does not support ULPI Serial mode. Only the legacy serial mode is supported.
Table 94. Serial Mode Signal Map for 6-pin FsLs Serial Mode
Signal
tx_enable
tx_dat
tx_se0
int
rx_dp
rx_dm
Maps to
data(0)
data(1)
data(2)
data(3)
data(4)
data(5)
Direction
Description
In
Active high transmit enable
In
Transmit differential data on D+/D–
In
Transmit single-ended zero on D+/D–
Out
Active high interrupt indication
Must be asserted whenever any unmasked interrupt occurs
Out
Single-ended receive data from D+
Out
Single-ended receive data from D–
i.MX51 Applications Processors for Consumer and Industrial Products, Rev. 1
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Freescale Semiconductor
Preliminary—Subject to Change Without Notice