MII Receive Signal Timing (MII_RXD[3:0], MII_RX_DV, MII_RX_ER, MII_RX_CLK)
13.1 MII Receive Signal Timing (MII_RXD[3:0],
MII_RX_DV, MII_RX_ER, MII_RX_CLK)
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 13-27 provides information on the MII receive signal timing.
Table 13-27. MII Receive Signal Timing
Num
Characteristic
Min
Max
Unit
M1
M2
M3
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
5
5
—
—
ns
ns
35%
65%
MII_RX_CLK
period
M4
MII_RX_CLK pulse width low
35%
65%
MII_RX_CLK
period
Figure 13-70 shows MII receive signal timing.
M3
MII_RX_CLK (Input)
M4
MII_RXD[3:0] (Inputs)
MII_RX_DV
MII_RX_ER
M1
M2
Figure 13-70. MII Receive Signal Timing Diagram
13.2 MII Transmit Signal Timing (MII_TXD[3:0],
MII_TX_EN, MII_TX_ER, MII_TX_CLK)
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 13-28 provides information on the MII transmit signal timing.
MOTOROLA
MPC860 Family Hardware Specifications
67
MOTOROLA [ MOTOROLA ]
