MCIMX255AJM4A(2010) Просмотр технического описания (PDF) - Freescale Semiconductor

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MCIMX255AJM4A
(Rev.:2010)

i.MX25 Applications Processor for Automotive Products

Freescale Semiconductor 

Figure 93 shows the USB transmit waveform in VP_VM bidirectional mode diagram.

Transmit

US1

USB_TXENB

USB_VPOUT

US4

US2

USB_VMOUT

US3

Figure 93. USB Transmit Waveform in VP_VM Bidirectional Mode

Figure 94 shows the USB receive waveform in VP_VM bidirectional mode diagram.

Receive

US5

USB_VPIN

USB_VMIN

US6

Figure 94. USB Receive Waveform in VP_VM Bidirectional Mode

Table 93 shows the USB port timing specification in VP_VM bidirectional mode.

Table 93. USB Port Timing Specifications in VP_VM Bidirectional Mode

No.

US18

US19

US20

US21

US22

US23

US24

US25

Parameter

Signal Name Direction

Min.

Tx rise/fall time

USB_DAT_VP

Out

—

Tx rise/fall time USB_SE0_VM

Out

—

Tx rise/fall time

USB_TXOE_B

Out

—

Tx duty cycle

USB_DAT_VP

Out

49.0

Tx high overlap USB_SE0_VM

Out

0.0

Tx low overlap

USB_SE0_VM

Out

—

Enable delay

USB_DAT_VP

In

—

USB_SE0_VM

Disable delay

USB_DAT_VP

In

—

USB_SE0_VM

Max.

5.0

5.0

5.0

51.0

—

0.0

8.0

10.0

Unit

ns

ns

ns

%

ns

ns

ns

Condition/

Reference Signal

50 pF

50 pF

50 pF

—

USB_DAT_VP

USB_DAT_VP

USB_TXOE_B

ns

USB_TXOE_B

i.MX25 Applications Processor for Automotive Products, Rev. 5

Freescale Semiconductor

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