IMX35 datasheet(123/148 Pages) FREESCALE

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i.MX35 Applications Processors for Industrial and Consumer Products, Rev. 6

Freescale Semiconductor

123

4.9.23.2.14

UART IrDA Mode Receiver

Figure 100 depicts the UART IrDA mode receive timing, with 8 data bit/1 stop bit format. Table 81 lists

the receive timing characteristics.

Figure 100. UART IrDA Mode Receive Timing Diagram

4.9.24

USB Electrical Specifications

In order to support four different serial 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

Table 80. IrDA Mode Transmit Timing Parameters

Parameter

Symbol

Min.

Max.

Units

UA3

Transmit bit time in IrDA mode

tTIRbit

1/Fbaud_rate

1 –

Tref_clk

1 F

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

2 T

ref_clk: The period of UART reference clock ref_clk (ipg_perclk after RFDIV divider).

1/Fbaud_rate + Tref_clk

—

UA4

Transmit IR pulse duration

tTIRpulse

(3/16)

× (1/Fbaud_rate)

– Tref_clk

(3/16)

× (1/Fbaud_rate)

+ Tref_clk

—

Table 81. IrDA Mode Receive Timing Parameters

Parameter

Symbol

Min.

Max.

Units

UA5

Receive bit time1 in IrDA 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).

tRIRbit

1/Fbaud_rate

2 –

1/(16

× Fbaud_rate)

2 F

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

1/Fbaud_rate +

1/(16

× Fbaud_rate)

—

UA6

Receive IR pulse duration

tRIRpulse

1.41 us

(5/16)

× (1/Fbaud_rate)—

Bit 1

Bit 2

Bit 0

Bit 4

Bit 5

Bit 6

Bit 7

RXD

(input)

Bit 3

Start

Bit

STOP

BIT

Possible

Parity

Bit

UA5

UA6

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