PCIMX6QP5AVT2AB datasheet(129/160 Pages) NXP

129 / 160 page

Electrical Characteristics

i.MX 6DualPlus/6QuadPlus Applications Processors Industrial Products, Rev. 3, 11/2018

NXP Semiconductors

129

4.12.20.2.3 UART IrDA Mode Timing

The following subsections give the UART transmit and receive timings in IrDA mode.

UART IrDA Mode Transmitter

Figure 92 depicts the UART IrDA mode transmit timing, with 8 data bit/1 stop bit format. Table 80 lists

the transmit timing characteristics.

Figure 92. UART IrDA Mode Transmit Timing Diagram

UART IrDA Mode Receiver

Figure 93 depicts the UART IrDA mode receive timing, with 8 data bit/1 stop bit format. Table 81 lists

the receive timing characteristics.

Figure 93. UART IrDA Mode Receive Timing Diagram

Table 80. IrDA Mode Transmit Timing Parameters

Parameter

Symbol

Min

Max

Unit

UA3

Transmit Bit Time in IrDA mode

tTIRbit

1/Fbaud_rate

1 – T

ref_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

Unit

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

μs

(5/16)

× (1/Fbaud_rate)—

Bit 1

Bit 2

Bit 0

Bit 4

Bit 5

Bit 6

Bit 7

UARTx_TX_DATA

(output)

Bit 3

Start

Bit

STOP

BIT

POSSIBLE

PARITY

BIT

UA3

UA4

Bit 1

Bit 2

Bit 0

Bit 4

Bit 5

Bit 6

Bit 7

Bit 3

STOP

BIT

POSSIBLE

PARITY

BIT

UA5

UA6

Start

Bit

UARTx_RX_DATA

(input)

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