MCIMX35 Motorola Semiconductor Products, MCIMX35 Datasheet - Page 55

• Manufacturer Part Number: MCIMX35
• Manufacturer: Motorola Semiconductor Products

4.7.8.3
The transmitter timing signals consist of FEC_TXD[3:0], FEC_TX_EN, FEC_TX_ER, and
FEC_TX_CLK. The transmitter functions correctly up to a 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.
1
Figure 29
4.7.8.4
The MII asynchronous timing signals are FEC_CRS and FEC_COL.
inputs signal timing.
1
Freescale Semiconductor
FEC_TX_EN, FEC_TX_CLK, and FEC_TXD0 have the same timing when in 10 Mbps 7-wire interface mode.
FEC_COL has the same timing in 10 Mbit 7-wire interface mode.
Num
Num
M5
M6
M7
M8
M9
MCIMX35 (i.MX35) Multimedia Applications Processor for Automotive Products Advance Information, Rev. 0
1
FEC_TXD[3:0] (outputs)
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 the MII transmit signal timings listed in
FEC_TX_CLK (input)
MII Transmit Signal Timing
MII Asynchronous Inputs Signal Timing
FEC_TX_EN
FEC_TX_ER
FEC_CRS to FEC_COL minimum pulse width
Characteristic
Characteristic
Figure 29. MII Transmit Signal Timing Diagram
Preliminary—Subject to Change Without Notice
Table 42. MII Asynch Inputs Signal Timing
Table 41. MII Transmit Signal Timing
1
M5
Table 41
M6
M7
Table
lists MII transmit channel timings.
41.
Min.
35%
35%
Min.
1.5
—
5
Table 42
M8
Max.
Max.
65%
65%
20
—
—
lists MII asynchronous
FEC_TX_CLK period
FEC_TX_CLK period
FEC_TX_CLK period
Unit
Unit
ns
ns
55