MCIMX35_10 Datasheet, PDF (124/148 Pages) Freescale Semiconductor, Inc – i.MX35 Applications Processors for Industrial and Consumer Products

Table 81. IrDA Mode Transmit Timing Parameters
ID
Parameter
Symbol
Min.
Max.
Units
UA3
Transmit bit time in IrDA mode
t_TIRbit
1/F_{baud_rate1} –
T_{ref_clk2}
1/F_{baud_rate} + T_{ref_clk} —
UA4
Transmit IR pulse duration
t_TIRpulse (3/16) × (1/F_{baud_rate}) (3/16) × (1/F_{baud_rate}) —
– T_{ref_clk}
+ T_{ref_clk}
1 _{Fbaud_rate: Baud rate frequency. The maximum baud rate the UART can support is (ipg_perclk frequency)/16.}
2 _{Tref_clk: The period of UART reference clock ref_clk (ipg_perclk after RFDIV divider).}
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 82 lists
the receive timing characteristics.
UA5
UA5
UA6
UA5 UA5
RXD
(input)
Start
Bit
Bit 0
Bit 1
Bit 2
Bit 3
Bit 4
Bit 5
Bit 6
Bit 7
Possible
Parity
Bit
STOP
BIT
Figure 100. UART IrDA Mode Receive Timing Diagram
Table 82. IrDA Mode Receive Timing Parameters
ID
Parameter
Symbol
Min.
Max.
Units
UA5 Receive bit time¹ in IrDA mode
t_RIRbit
1/F_{baud_rate2} –
1/F_{baud_rate} +
—
1/(16 × F_{baud_rate}) 1/(16 × F_{baud_rate})
UA6 Receive IR pulse duration
t_RIRpulse
1.41 us
(5/16) × (1/F_{baud_rate}) —
1 _{The UART receiver can tolerate 1/(16 × Fbaud_rate) tolerance in each bit. But accumulation tolerance in one frame must not}
exceed 3/(16 × F_{baud_rate}).
2 _{Fbaud_rate: Baud rate frequency. The maximum baud rate the UART can support is (ipg_perclk frequency) ÷ 16.}
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
i.MX35 Applications Processors for Automotive Products, Rev. 8
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