mcf5208 Freescale Semiconductor, Inc, mcf5208 Datasheet - Page 38

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

Electrical Characteristics
5.12.2 MII Transmit Signal Timing (FEC_TXD[3:0], FEC_TXEN,
Table 19
The transmitter functions correctly up to a FEC_TXCLK maximum frequency of 25 MHz +1%. In
addition, the processor clock frequency must exceed twice the FEC_TXCLK frequency.
Figure 24
5.12.3 MII Async Inputs Signal Timing (FEC_CRS and FEC_COL)
Table 20
Figure 25
38
Num
Num
M5
M6
M7
M8
M9
FEC_TXD[3:0] (outputs)
lists MII transmit channel timings.
lists MII asynchronous inputs signal timing.
shows MII transmit signal timings listed in
shows MII asynchronous input timings listed in
FEC_TXER, FEC_TXCLK)
FEC_TXCLK (input)
FEC_TXCLK to FEC_TXD[3:0], FEC_TXEN, FEC_TXER
invalid
FEC_TXCLK to FEC_TXD[3:0], FEC_TXEN, FEC_TXER valid
FEC_TXCLK pulse width high
FEC_TXCLK pulse width low
FEC_CRS, FEC_COL minimum pulse width
FEC_TXEN
FEC_TXER
FEC_CRS
FEC_COL
MCF5208 ColdFire
Figure 24. MII Transmit Signal Timing Diagram
Figure 25. MII Async Inputs Timing Diagram
Characteristic
Characteristic
Table 20. MII Async Inputs Signal Timing
Table 19. MII Transmit Signal Timing
®
Microprocessor Data Sheet, Rev. 1
M5
M6
M7
Table
M9
Table
19.
20.
35%
35%
Min
Min
1.5
—
M8
5
Max
65%
65%
Max
25
—
—
Freescale Semiconductor
FEC_TXCLK period
FEC_TXCLK period
FEC_TXCLK period
Unit
Unit
ns
ns