PCIMX536AVV8B datasheet(141/180 Pages) FREESCALE

141 / 180 page

Electrical Characteristics

i.MX53xA Automotive and Infotainment Applications Processors, Rev. 1

Freescale Semiconductor

141

4.7.19

USB-OH-3 Parameters

This section describes the electrical parameters of the USB OTG port and USB HOST ports. For on-chip

USB PHY parameters see Section 4.7.20, “USB PHY Parameters.”

4.7.19.1

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

4.7.19.1.1

DAT_SE0 Bidirectional Mode

Figure 93. USB Transmit Waveform in DAT_SE0 Bidirectional Mode

The UART receiver can tolerate 1/(16*Fbaud_rate) tolerance in each bit. But accumulation tolerance in one frame must not

exceed 3/(16*Fbaud_rate).

2 F

baud_rate: Baud rate frequency. The maximum baud rate the UART can support is (ipg_perclk frequency)/16.

Table 91. Signal Definitions - DAT_SE0 Bidirectional Mode

Name

Direction

Signal Description

USB_TXOE_B

Out

Transmit enable, active low

USB_DAT_VP

Out

TX data when USB_TXOE_B is low

Differential RX data when USB_TXOE_B is high

USB_SE0_VM

Out

SE0 drive when USB_TXOE_B is low

SE0 RX indicator when USB_TXOE_B is high

USB_DAT_VP

USB_SE0_VM

US1

US2

Transmit

US4

USB_TXOE_B

US3

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