参数资料
型号: MCIMX27VOP4
厂商: FREESCALE SEMICONDUCTOR INC
元件分类: 微控制器/微处理器
英文描述: 32-BIT, 400 MHz, MICROPROCESSOR, PBGA404
封装: 17 X 17 MM, 0.65 MM PITCH, LEAD FEE, MAPBGA-404
文件页数: 72/118页
文件大小: 1159K
代理商: MCIMX27VOP4
Signal Descriptions
i.MX27 Data Sheet, Advance Information, Rev. 0.1
Freescale Semiconductor
Preliminary—Subject to Change Without Notice
57
3.5.8.1
MII Receive Signal Timing (FEC_RXD[3:0], FEC_RX_DV, FEC_RX_ER,
and FEC_RX_CLK)
The receiver functions correctly up to a FEC_RX_CLK maximum frequency of 25 MHz + 1%. There is
no minimum frequency requirement. In addition, the FEC IPG clock frequency must exceed twice the
FEC_RX_CLK frequency.
Figure 17 shows the MII receive signal timings, and Table 24 lists the timing parameters.
Figure 17. MII Receive Signal Timing Diagram
3.5.8.2
MII Transmit Signal Timing (FEC_TXD[3:0], FEC_TX_EN, FEC_TX_ER,
and FEC_TX_CLK)
The transmitter functions correctly up to a FEC_TX_CLK maximum frequency of 25 MHz + 1%. There
is no minimum frequency requirement. In addition, the FEC IPG clock frequency must exceed twice the
FEC_TX_CLK frequency.
Figure 18 shows the MII transmit signal timings, and Table 25 lists the timing parameters.
Table 24. MII Receive Signal Timing Parameters
ID
Parameter1
1
FEC_RX_DV, FEC_RX_CLK, and FEC_RXD0 have the same timing in 10 Mbps 7-wire interface mode.
Min
Max
Unit
M1
FEC_RXD[3:0], FEC_RX_DV, FEC_RX_ER to FEC_RX_CLK
setup
5—
ns
M2
FEC_RX_CLK to FEC_RXD[3:0], FEC_RX_DV, FEC_RX_ER
hold
5—
ns
M3
FEC_RX_CLK pulse width high
35%
65%
FEC_RX_CLK period
M4
FEC_RX_CLK pulse width low
35%
65%
FEC_RX_CLK period
FEC_RX_CLK (input)
FEC_RXD[3:0] (inputs)
FEC_RX_DV
FEC_RX_ER
M3
M4
M1
M2
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