MCF5485 FREESCALE [Freescale Semiconductor, Inc], MCF5485 Datasheet - Page 23

• Manufacturer Part Number: MCF5485
• Description: Integrated Microprocessor Electrical Characteristics
• Manufacturer: FREESCALE [Freescale Semiconductor, Inc]

12
12.1
The following timing specs are defined at the chip I/O pin and must be translated appropriately to arrive at timing
specs/constraints for the EMAC_10_100 I/O signals.
The following timing specs meet the requirements for MII and 7-Wire style interfaces for a range of transceiver devices. If this
interface is used with a specific transceiver device, the timing specs may be altered to match that specific transceiver.
Freescale Semiconductor
Num
M1
M2
M3
M4
Fast Ethernet AC Timing Specifications
MII/7-WIRE Interface Timing Specs
RXD[3:0], RXDV, RXER to RXCLK setup
RXCLK to RXD[3:0], RXDV, RXER hold
RXCLK pulse width high
RXCLK pulse width low
RXD[3:0] (Inputs)
RXCLK (Input)
MCF5485 Integrated Microprocessor Electrical Characteristics, Rev. 3
RXDV,
RXER
Figure 19. MII Receive Signal Timing Diagram
Characteristic
Table 15. MII Receive Signal Timing
M1
M3
M2
M4
35%
35%
Min
5
Fast Ethernet AC Timing Specifications
5
Max
65%
65%
—
—
RXCLK period
RXCLK period
Unit
ns
ns
23