參數(shù)資料
型號: MPC5553EVBISYS
廠商: Freescale Semiconductor
文件頁數(shù): 41/68頁
文件大?。?/td> 0K
描述: KIT EVAL ISYSTEMS MPC5553
標準包裝: 1
類型: 微控制器
適用于相關(guān)產(chǎn)品: MPC5553
所含物品: 評估板和演示軟件
相關(guān)產(chǎn)品: MPC5553MZQ132-ND - IC MCU MPC5553 REV A 324-PBGA
MPC5553MZP132-ND - IC MCU MPC5553 REV A 416-PBGA
MPC5553 Microcontroller Data Sheet, Rev. 4
Electrical Characteristics
Freescale Semiconductor
46
3.14
Fast Ethernet AC Timing Specifications
Media Independent Interface (MII) Fast Ethernet Controller (FEC) signals use transistor-to-transistor logic
(TTL) signal levels compatible with devices operating at 3.3 V. The timing specifications for the MII FEC
signals are independent of the system clock frequency (part speed designation).
3.14.1
MII FEC Receive Signal Timing
FEC_RXD[3:0], FEC_RX_DV, FEC_RX_ER, and FEC_RX_CLK
The receive functions correctly up to an FEC_RX_CLK maximum frequency of 25 MHz plus one percent.
There is no minimum frequency requirement. The processor clock frequency must exceed four times the
FEC_RX_CLK frequency.
Table 28 lists MII FEC receive channel timings.
Figure 28 shows MII FEC receive signal timings listed in Table 28.
Figure 28. MII FEC Receive Signal Timing Diagram
Table 28. MII FEC Receive Signal Timing
Spec
Characteristic
Min.
Max
Unit
1
FEC_RXD[3:0], FEC_RX_DV, FEC_RX_ER to FEC_RX_CLK setup
5
ns
2
FEC_RX_CLK to FEC_RXD[3:0], FEC_RX_DV, FEC_RX_ER hold
5
ns
3
FEC_RX_CLK pulse-width high
35%
65%
FEC_RX_CLK period
4
FEC_RX_CLK pulse-width low
35%
65%
FEC_RX_CLK period
1
2
FEC_RX_CLK (input)
FEC_RXD[3:0] (inputs)
FEC_RX_DV
FEC_RX_ER
3
4
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