MCIMX257DJM4A Freescale, MCIMX257DJM4A Datasheet - Page 87
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MCIMX257DJM4A
Manufacturer Part Number
MCIMX257DJM4A
Description
Manufacturer
Freescale
Datasheet
1.MCIMX257DJM4A.pdf
(142 pages)
Specifications of MCIMX257DJM4A
Operating Temperature (min)
-20C
Operating Temperature (max)
70C
Operating Temperature Classification
Commercial
Mounting
Surface Mount
Lead Free Status / RoHS Status
Compliant
Available stocks
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Part Number
Manufacturer
Quantity
Price
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Part Number:
MCIMX257DJM4A
Manufacturer:
Piecemakers
Quantity:
101
Company:
Part Number:
MCIMX257DJM4A
Manufacturer:
Freescale Semiconductor
Quantity:
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3.7.9.1.5
The transmitter functions correctly up to an FEC_TX_CLK maximum frequency of 25 MHz + 1%. There
is no minimum frequency requirement. Additionally, the processor clock frequency must exceed twice the
FEC_TX_CLK frequency.
Figure 56
in the figure.
1
3.7.9.1.6
Figure 57
the figure.
Freescale Semiconductor
M5
M6
M7
M8
FEC_TX_EN, FEC_TX_CLK, and FEC_TXD0 have the same timing in 10-Mbps 7-wire interface mode.
ID
FEC_TXD[3:0] (outputs)
FEC_TX_CLK (input)
FEC_TX_CLK to FEC_TXD[3:0], FEC_TX_EN, FEC_TX_ER invalid
FEC_TX_CLK to FEC_TXD[3:0], FEC_TX_EN, FEC_TX_ER valid
FEC_TX_CLK pulse width high
FEC_TX_CLK pulse width low
shows MII asynchronous input timings.
shows MII transmit signal timings.
FEC_CRS, FEC_COL
FEC_TX_EN
FEC_TX_ER
MII Transmit Signal Timing (FEC_TXD[3:0], FEC_TX_EN, FEC_TX_ER, and
FEC_TX_CLK)
MII Asynchronous Inputs Signal Timing (FEC_CRS and FEC_COL)
i.MX25 Applications Processor for Consumer and Industrial Products, Rev. 6
Figure 56. MII Transmit Signal Timing Diagram
Figure 57. MII Async Inputs Timing Diagram
Characteristic
Table 61. MII Transmit Signal Timing
1
Table 61
M5
Table 62
M6
M7
describes the timing parameters (M5–M8) shown
describes the timing parameter (M9) shown in
M9
Min.
35%
35%
—
M8
5
Max.
65%
65%
—
20
FEC_TX_CLK period
FEC_TX_CLK period
Unit
ns
ns
87
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