MPC857DSL Motorola, MPC857DSL Datasheet - Page 70

• Manufacturer Part Number: MPC857DSL
• Description: (MPC857 / MPC862) Hardware Specifications
• Manufacturer: Motorola

FEC Electrical Characteristics
FEC Electrical Characteristics
13.1
The receiver functions correctly up to a MII_RX_CLK maximum frequency of 25MHz +1%. There is no
minimum frequency requirement. In addition, the processor clock frequency must exceed the
MII_RX_CLK frequency - 1%.
Table 29 provides information on the MII receive signal timing.
Figure 73 shows MII receive signal timing.
13.2
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%.
Table 30 provides information on the MII transmit signal timing.
70
Num
Num
M1
M2
M3
M4
M5
M6
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
MII_TX_CLK to MII_TXD[3:0], MII_TX_EN, MII_TX_ER invalid
MII_TX_CLK to MII_TXD[3:0], MII_TX_EN, MII_TX_ER valid
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)
MPC862/857T/857DSL Hardware Specifications
Freescale Semiconductor, Inc.
Figure 73. MII Receive Signal Timing Diagram
Characteristic
For More Information On This Product,
Characteristic
Table 30. MII Transmit Signal Timing
Table 29. MII Receive Signal Timing
M1
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M2
M3
35%
35%
Min
M4
Min
5
5
—
5
Max
65%
65%
Max
—
—
25
—
MII_RX_CLK period
MII_RX_CLK period
MOTOROLA
Unit
Unit
ns
ns
ns