mcf5208 Freescale Semiconductor, Inc, mcf5208 Datasheet - Page 37

• Manufacturer Part Number: mcf5208
• Description: Mcf5208 Coldfire Microprocessor Data Sheet
• Manufacturer: Freescale Semiconductor, Inc

5.12 Fast Ethernet AC Timing Specifications
MII signals use TTL signal levels compatible with devices operating at 5.0 V or 3.3 V.
5.12.1 MII Receive Signal Timing (FEC_RXD[3:0], FEC_RXDV,
The receiver functions correctly up to a FEC_RXCLK maximum frequency of 25 MHz +1%. There is no
minimum frequency requirement. In addition, the processor clock frequency must exceed twice the
FEC_RXCLK frequency.
Table 18
Figure 23
Freescale Semiconductor
I2C_SDA
I2C_SCL
FEC_RXD[3:0] (inputs)
Num
M1
M2
M3
M4
lists MII receive channel timings.
FEC_RXCLK (input)
shows MII receive signal timings listed in
FEC_RXER, and FEC_RXCLK)
FEC_RXD[3:0], FEC_RXDV, FEC_RXER to FEC_RXCLK
setup
FEC_RXCLK to FEC_RXD[3:0], FEC_RXDV, FEC_RXER hold
FEC_RXCLK pulse width high
FEC_RXCLK pulse width low
FEC_RXER
FEC_RXDV
I1
MCF5208 ColdFire
I2
Figure 23. MII Receive Signal Timing Diagram
Characteristic
Figure 22. I
Table 18. MII Receive Signal Timing
I4
M1
®
2
Microprocessor Data Sheet, Rev. 1
M2
I6
C Input/Output Timings
M3
Table
I7
18.
M4
I8
35%
35%
Min
5
5
Max
65%
65%
—
—
I5
I3
FEC_RXCLK period
FEC_RXCLK period
Electrical Characteristics
Unit
ns
ns
I9
37