Ethernet: Three-Speed,10/100, MII Management
Table 30. MII DC Electrical Characteristics
Parameter
Symbol
Min
Max
Unit
Supply voltage 3.3 V
OVDD
VOH
3.13
2.40
3.47
V
V
Output high voltage
OVDD + 0.3
(OVDD = Min, IOH = –4.0 mA)
Output low voltage
VOL
GND
0.50
V
(OVDD = Min, IOL = 4.0 mA)
Input high voltage
Input low voltage
VIH
VIL
IIH
1.70
–0.3
—
—
0.90
40
V
V
Input high current
μA
1
(VIN= OVDD
)
Input low current
(VIN= GND 1)
IIL
–600
—
μA
Note:
1.Note that the symbol VIN, in this case, represents the OVIN symbol referenced in Table 1 and Table 2.
8.3.2 MII AC Electrical Specifications
This section describes the MII transmit and receive AC specifications.
8.3.2.1 MII Transmit AC Timing Specifications
Table 31 provides the MII transmit AC timing specifications.
Table 31. MII Transmit AC Timing Specifications
At recommended operating conditions with OVDD of 3.3 V 5%.
Parameter/Condition
TX_CLK clock period 10 Mbps
Symbol 1
Min
Typ
Max
Unit
tMTX
tMTX
tMTXH/ MTX
—
—
35
1
400
40
—
5
—
—
ns
ns
%
TX_CLK clock period 100 Mbps
TX_CLK duty cycle
t
65
15
4.0
TX_CLK to MII data TXD[3:0], TX_ER, TX_EN delay
TX_CLK data clock rise and fall time
Note:
tMTKHDX
ns
ns
2,3
tMTXR, tMTXF
1.0
—
1.The symbols used for timing specifications herein 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,
tMTKHDX symbolizes MII transmit timing (MT) from the time tMTX 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 tMTX 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).
2.Signal timings are measured at 0.7 V and 1.9 V voltage levels.
3.Guaranteed by design.
MPC8540 Integrated Processor Hardware Specifications, Rev. 4
32
Freescale Semiconductor
FREESCALE [ Freescale ]
