MPC859T FREESCALE [Freescale Semiconductor, Inc], MPC859T Datasheet - Page 72

• Manufacturer Part Number: MPC859T
• Description: Hardware Specifications
• Manufacturer: FREESCALE [Freescale Semiconductor, Inc]

FEC Electrical Characteristics
FEC Electrical Characteristics
14
This section provides the AC electrical specifications for the fast Ethernet controller (FEC). Note that the
timing specifications for the MII signals are independent of system clock frequency (part speed
designation). Also, MII signals use TTL signal levels compatible with devices operating at either 5.0 or 3.3
V.
14.1
The receiver functions correctly up to a MII_RX_CLK maximum frequency of 25 MHz + 1%. There is no
minimum frequency requirement. In addition, the processor clock frequency must exceed the
MII_RX_CLK frequency – 1%. Table 33 shows the timings for MII receive signal.
Figure 74 shows the timings for MII receive signal.
14.2
The transmitter functions correctly up to a MII_TX_CLK maximum frequency of 25 MHz +1%. There is
no minimum frequency requirement. In addition, the processor clock frequency must exceed the
MII_TX_CLK frequency - 1%.
72
Num
M1
M2
M3
M4
MII_RXD[3:0] (inputs)
MII_RX_DV
MII_RX_ER
MII_RX_CLK (input)
MII_RXD[3:0], MII_RX_DV, MII_RX_ER to MII_RX_CLK setup
MII_RX_CLK to MII_RXD[3:0], MII_RX_DV, MII_RX_ER hold
MII_RX_CLK pulse width high
MII_RX_CLK pulse width low
FEC Electrical Characteristics
MII Receive Signal Timing (MII_RXD [3:0], MII_RX_DV,
MII_RX_ER, MII_RX_CLK)
MII Transmit Signal Timing (MII_TXD[3:0], MII_TX_EN,
MII_TX_ER, MII_TX_CLK)
Freescale Semiconductor, Inc.
Figure 74. MII Receive Signal Timing Diagram
For More Information On This Product,
Characteristic
MPC866/859 Hardware Specifications
Table 33. MII Receive Signal Timing
M1
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M2
M3
M4
35%
35%
Min
5
5
65%
65%
Max
—
—
MII_RX_CLK period
MII_RX_CLK period
MOTOROLA
Unit
ns
ns