參數(shù)資料
型號: MCIMX258CVM4
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): 143/154頁
文件大小: 1498K
代理商: MCIMX258CVM4
i.MX25 Applications Processor for Consumer and Industrial Products, Rev. 8
Freescale Semiconductor
89
3.7.9.3
RMII Mode Timing
In RMII mode, FEC_TX_CLK is used as the REF_CLK, which is a 50 MHz ± 50 ppm continuous
reference clock. FEC_RX_DV is used as the CRS_DV in RMII. Other signals under RMII mode include
FEC_TX_EN, FEC_TXD[1:0], FEC_RXD[1:0] and FEC_RX_ER.
Figure 59 shows RMII mode timings. Table 66 describes the timing parameters (M16–M21) shown in the
figure.
Figure 59. RMII Mode Signal Timing Diagram
Table 66. RMII Signal Timing
ID
Characteristic
Min.
Max.
Unit
M16
REF_CLK(FEC_TX_CLK) pulse width high
35%
65%
REF_CLK period
M17
REF_CLK(FEC_TX_CLK) pulse width low
35%
65%
REF_CLK period
M18
REF_CLK to FEC_TXD[1:0], FEC_TX_EN invalid
3
ns
M19
REF_CLK to FEC_TXD[1:0], FEC_TX_EN valid
12
ns
M20
FEC_RXD[1:0], CRS_DV(FEC_RX_DV), FEC_RX_ER to REF_CLK setup
2
ns
M21
REF_CLK to FEC_RXD[1:0], FEC_RX_DV, FEC_RX_ER hold
2
ns
REF_CLK (input)
FEC_TX_EN
M16
M17
M18
M19
M20
M21
FEC_RXD[1:0]
FEC_TXD[1:0] (output)
FEC_RX_ER
CRS_DV (input)
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