參數(shù)資料
型號: MCIMX251AJM4A
廠商: FREESCALE SEMICONDUCTOR INC
元件分類: 微控制器/微處理器
英文描述: 32-BIT, 400 MHz, MICROPROCESSOR, PBGA400
封裝: 17 X 17 MM, 0.80 MM PITCH, ROHS COMPLIANT, PLASTIC, MAPBGA-400
文件頁數(shù): 21/140頁
文件大小: 1416K
代理商: MCIMX251AJM4A
i.MX25 Applications Processor for Automotive Products, Rev. 8
Freescale Semiconductor
117
3.7.19.2.4
UART IrDA Mode Receive Timing
Figure 88 shows the UART receive timing for IrDA mode, for a format of 8 data bits and 1 stop bit.
Table 89 describes the timing parameters (UA5–UA6) shown in the figure.
Figure 88. UART IrDA Mode Receive Timing Diagram
3.7.20
USBOTG Timing
This section describes timing for the USB OTG port and host ports. Both serial and parallel interfaces are
described.
3.7.20.1
USB Serial Interface Timing
The USB serial transceiver is configurable to four modes supporting four different serial interfaces:
DAT_SE0 bidirectional, 3-wire mode
DAT_SE0 unidirectional, 6-wire mode
VP_VM bidirectional, 4-wire mode
VP_VM unidirectional, 6-wire mode
The following subsections describe the timings for these four modes.
Table 88. UART IrDA Mode Transmit Timing Parameters
ID
Parameter
Symbol
Min.
Max.
Units
UA3
Transmit bit time in IrDA mode
tTIRbit
1/Fbaud_rate
1 – T
ref_clk
2
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/F
baud_rate) – Tref_clk (3/16) × (1/Fbaud_rate) + Tref_clk
Table 89. UART IrDA Mode Receive Timing Parameters
ID
Parameter
Symbol
Min.
Max.
Units
UA5
Receive bit time1 in IrDA mode
1 Note: The UART receiver can tolerate 1/(16
× F
baud_rate) tolerance in each bit. But accumulation tolerance in one frame must
not exceed 3/(16
× F
baud_rate).
tRIRbit
1/Fbaud_rate
2 – 1/(16
× F
baud_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/F
baud_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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