IMX51A Datasheet, PDF (128/160 Pages) Freescale Semiconductor, Inc – i.MX51A Automotive and Infotainment Applications Processors

Electrical Characteristics
Receive
USB_TXOE_B
USB_DAT_VP
USB_SE0_VM
US7
US8
USB_SE0_VM
Figure 94. USB Receive Waveform in DAT_SE0 Bi-Directional Mode
Table 97. Definitions of USB Receive Waveform in DAT_SE0 Bi-Directional Mode
ID
Parameter
Signal Name
Direction Min
Max
US1 TX Rise/Fall Time
USB_DAT_VP
Out
–
5.0
US2 TX Rise/Fall Time
USB_SE0_VM
Out
–
5.0
US3 TX Rise/Fall Time
USB_TXOE_B
Out
–
5.0
US4 TX Duty Cycle
USB_DAT_VP
Out
49.0
51.0
US7 RX Rise/Fall Time
USB_DAT_VP
In
–
3.0
US8 RX Rise/Fall Time
USB_SE0_VM
In
–
3.0
Unit
Conditions/
Reference Signal
ns
50 pF
ns
50 pF
ns
50 pF
%
–
ns
35 pF
ns
35 pF
3.7.17.1.2 USB DAT_SE0 Unidirectional Mode
Table 98. Signal Definitions—DAT_SE0 Unidirectional Mode
Name
USB_TXOE_B
USB_DAT_VP
USB_SE0_VM
USB_VP1
USB_VM1
USB_RCV
Direction
Out
Out
Out
In
In
In
Signal Description
Transmit enable, active low
TX data when USB_TXOE_B is low
SE0 drive when USB_TXOE_B is low
Buffered data on DP when USB_TXOE_B is high
Buffered data on DM when USB_TXOE_B is high
Differential RX data when USB_TXOE_B is high
i.MX51A Automotive and Infotainment Applications Processors, Rev. 1
128
Freescale Semiconductor
Preliminary—Subject to Change Without Notice