I.MX27 Datasheet, PDF (102/148 Pages) Freescale Semiconductor, Inc – Multimedia Applications Processor

Electrical Characteristics
Table 56. OTG Port Timing Specification in VP_VM Bidirectional Mode
Parameter
TX Rise/Fall Time
TX Rise/Fall Time
TX Rise/Fall Time
TX Duty Cycle
TX High Overlap
TX Low Overlap
Enable Delay
Disable Delay
RX Rise/Fall Time
RX Rise/Fall Time
RX Skew
RX Skew
Signal Name
Direction
Min
Max
Unit
Condition/
Reference Signal
USB_DAT_VP
Out
USB_SE0_VM
Out
USB_TXOE_B
Out
—
5.0
ns
—
5.0
ns
—
5.0
ns
50 pF
50 pF
50 pF
USB_DAT_VP
Out
49.0
51.0
%
—
USB_SE0_VM
Out
0.0
—
ns
USB_DAT_VP
USB_SE0_VM
Out
USB_DAT_VP
In
USB_SE0_VM
—
0.0
ns
USB_DAT_VP
—
8.0
ns
USB_TXOE_B
USB_DAT_VP
In
USB_SE0_VM
USB_DAT_VP
In
—
10.0
ns
USB_TXOE_B
—
3.0
ns
35 pF
USB_SE0_VM
In
—
3.0
ns
35 pF
USB_DAT_VP
USB_RCV
Out
–4.0
+4.0
ns
USB_SE0_VM
Out
–6.0
+2.0
ns
USB_DAT_VP
4.3.14.4
VP_VM Unidirectional Mode
Table 57. Signal Definitions—VP_VM Unidirectional Mode
Name
USB_TXOE_B
USB_DAT_VP
USB_SE0_VM
USB_VP1
USB_VM1
USB_RCV
Direction
Signal Description
Out
Transmit enable, active low
Out
TX VP data when USB_TXOE_B is low
Out
TX VM data when USB_TXOE_B is low
In
RX VP data when USB_TXOE_B is high
In
RX VM data when USB_TXOE_B is high
In
Differential RX data
i.MX27 and i.MX27L Data Sheet, Rev. 1.5
102
Freescale Semiconductor