參數(shù)資料
型號: MCIMX281AVM4B
廠商: FREESCALE SEMICONDUCTOR INC
元件分類: 微控制器/微處理器
英文描述: 32-BIT, 454 MHz, RISC PROCESSOR, PBGA289
封裝: 14 X 14 MM, 0.80 MM PITCH, ROHS COMPLIANT, PLASTIC, MAPBGA-289
文件頁數(shù): 30/72頁
文件大小: 915K
代理商: MCIMX281AVM4B
i.MX28 Applications Processors Data Sheet for Automotive Products, Rev. 1
36
Freescale Semiconductor
3.5.4.1.4
MII Serial Management Channel Timing (ENET0_MDIO and ENET0_MDC)
The MDC frequency is designed to be equal to or less than 2.5 MHz to be compatible with the IEEE 802.3
MII specification. However the ENET can function correctly with a maximum MDC frequency of
15 MHz.
Figure 12 shows MII asynchronous input timings. Table 42 describes the timing parameters (M10–M15)
shown in the figure.
Figure 12. MII Serial Management Channel Timing Diagram
3.5.4.2
RMII Mode Timing
In RMII mode, ENET_CLK is used as the REF_CLK, which is a 50 MHz ± 50 ppm continuous reference
clock. ENET0_RX_DV is used as the CRS_DV in RMII. Other signals under RMII mode include
ENET0_TX_EN, ENET0_TXD[1:0], ENET0_RXD[1:0] and ENET0_RX_ER.
Table 42. MII Serial Management Channel Timing
ID
Characteristic
Min.
Max.
Unit
M10
ENET0_MDC falling edge to ENET0_MDIO output invalid (min.
propagation delay)
0—
ns
M11
ENET0_MDC falling edge to ENET0_MDIO output valid (max.
propagation delay)
—5
ns
M12
ENET0_MDIO (input) to ENET0_MDC rising edge setup
18
ns
M13
ENET0_MDIO (input) to ENET0_MDC rising edge hold
0
ns
M14
ENET0_MDC pulse width high
40%
60%
ENET0_MDC period
M15
ENET0_MDC pulse width low
40%
60%
ENET0_MDC period
ENET0_MDC (output)
ENET0_MDIO (output)
M14
M15
M10
M11
M12
M13
ENET0_MDIO (input)
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