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Ethernet and MII management
Table 19. MII and RMII DC electrical characteristics
Parameter
Supply voltage 3.3 V
Symbol
OV DD
Conditions
—
Min
3
Max
3.6
Unit
V
Output high voltage
Output low voltage
Input high voltage
Input low voltage
V OH
V OL
V IH
V IL
I OH = –4.0 mA
I OL = 4.0 mA
—
—
OV DD = Min
OV DD = Min
—
—
2.40
GND
2.0
–0.3
OV DD + 0.3
0.50
OV DD + 0.3
0.90
V
V
V
V
Input current
I IN
0 V ≤ V IN ≤ OV DD
—
±5
μ A
8.2
MII and RMII AC timing specifications
The AC timing specifications for MII and RMII are presented in this section.
8.2.1
MII AC timing specifications
This section describes the MII transmit and receive AC timing specifications.
8.2.1.1
MII transmit AC timing specifications
The following table provides the MII transmit AC timing specifications.
Table 20. MII transmit AC timing specifications
At recommended operating conditions with OV DD of 3.3 V ± 300mV.
Parameter/Condition
TX_CLK clock period 10 Mbps
TX_CLK clock period 100 Mbps
TX_CLK duty cycle
TX_CLK to MII data TXD[3:0], TX_ER, TX_EN delay
TX_CLK data clock rise V IL (min) to V IH (max)
TX_CLK data clock fall V IH (max) to V IL (min)
Symbol 1
t MTX
t MTX
t MTXH /t MTX
t MTKHDX
t MTXR
t MTXF
Min
—
—
35
1
1.0
1.0
Typical
400
40
—
5
—
—
Max
—
—
65
15
4.0
4.0
Unit
ns
ns
%
ns
ns
ns
Note:
1. The symbols used for timing specifications follow the pattern of t (first two letters of functional block)(signal)(state)(reference)(state) for
inputs and t (first two letters of functional block)(reference)(state)(signal)(state) for outputs. For example, t MTKHDX symbolizes MII transmit
timing (MT) for the time t MTX clock reference (K) going high (H) until data outputs (D) are invalid (X). Note that, in general,
the clock reference symbol representation is based on two to three letters representing the clock of a particular functional.
For example, the subscript of t MTX represents the MII(M) transmit (TX) clock. For rise and fall times, the latter convention is
used with the appropriate letter: R (rise) or F (fall).
MPC8309 PowerQUICC II Pro Integrated Communications Processor Family Hardware Specifications, Rev. 3
Freescale Semiconductor
23
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