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MPC5673K bảng dữ liệu(PDF) 124 Page - Freescale Semiconductor, Inc

tên linh kiện MPC5673K
Giải thích chi tiết về linh kiện  Microcontroller is a 32-bit embedded controller designed for advanced
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nhà sản xuất  FREESCALE [Freescale Semiconductor, Inc]
Trang chủ  http://www.freescale.com
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MPC5673K bảng dữ liệu(HTML) 124 Page - Freescale Semiconductor, Inc

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MPC5675K Microcontroller Data Sheet, Rev. 4
Preliminary—Subject to Change Without Notice
Electrical characteristics
Freescale Semiconductor
124
Figure 51. MII receive signal timing diagram
3.22.8.2
MII transmit signal timing (TXD[3:0], TX_EN, TX_ER, TX_CLK)
The transmitter functions correctly up to a TX_CLK maximum frequency of 25 MHz +1%. There is no
minimum frequency requirement. In addition, the system clock frequency must exceed four times the
TX_CLK frequency.
The transmit outputs (TXD[3:0], TX_EN, TX_ER) can be programmed to transition from either the rising
or falling edge of TX_CLK, and the timing is the same in either case. This options allows the use of
non-compliant MII PHYs.
Refer to the Ethernet chapter for details of this option and how to enable it.
Figure 52. MII transmit signal timing diagram
Table 70. MII transmit signal timing1
NOTES:
1 Output pads configured with SRC = 0b11.
No.
Parameter
Min
Max
Unit
5
TX_CLK to TXD[3:0], TX_EN, TX_ER invalid
5—
ns
6
TX_CLK to TXD[3:0], TX_EN, TX_ER valid
—25
ns
7
TX_CLK pulse width high
40%
60%
TX_CLK period
8
TX_CLK pulse width low
40%
60%
TX_CLK period
1
2
RX_CLK (input)
RXD[3:0] (inputs)
RX_DV
RX_ER
3
4
6
TX_CLK (input)
TXD[3:0] (outputs)
TX_EN
TX_ER
5
7
8



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