MCIMX35 Motorola Semiconductor Products, MCIMX35 Datasheet - Page 56

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

Figure 30
4.7.8.5
Serial management channel timing is accomplished using FEC_MDIO and FEC_MDC. The FEC
functions correctly with a maximum MDC frequency of 2.5 MHz.
channel timings.
The MDC frequency should be equal to or less than 2.5 MHz to be compliant with the IEEE 802.3 MII
specification. However the FEC can function correctly with a maximum MDC frequency of 15 MHz.
Figure 31
56
Num
M10
M11
M12
M13
M14
M15
MCIMX35 (i.MX35) Multimedia Applications Processor for Automotive Products Advance Information, Rev. 0
FEC_MDC falling edge to FEC_MDIO output invalid (minimum
propagation delay)
FEC_MDC falling edge to FEC_MDIO output valid (max.
propagation delay)
FEC_MDIO (input) to FEC_MDC rising edge setup
FEC_MDIO (input) to FEC_MDC rising edge hold
FEC_MDC pulse width high
FEC_MDC pulse width low
shows MII asynchronous input timings listed in
shows MII serial management channel timings listed in
FEC_CRS, FEC_COL
MII Serial Management Channel Timing
Characteristic
Figure 30. MII Asynch Inputs Timing Diagram
Preliminary—Subject to Change Without Notice
Table 43. MII Transmit Signal Timing
Table
M9
42.
Table
Min.
40%
40%
Table 43
18
—
0
0
43.
lists MII serial management
Max.
60%
60%
—
—
—
5
ns
ns
ns
FEC_MDC period
FEC_MDC period
ns
Freescale Semiconductor
Unit