MPC8540CPX667JC datasheet(32/104 Pages) FREESCALE

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MPC8540 Integrated Processor Hardware Specifications, Rev. 4

Freescale Semiconductor

Ethernet: Three-Speed,10/100, MII Management

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 30. MII DC Electrical Characteristics

Parameter

Symbol

Min

Max

Unit

Supply voltage 3.3 V

OVDD

3.13

3.47

Output high voltage

(OVDD = Min, IOH = –4.0 mA)

VOH

2.40

OVDD + 0.3

Output low voltage

(OVDD = Min, IOL = 4.0 mA)

VOL

GND

0.50

Input high voltage

VIH

1.70

—

Input low voltage

VIL

–0.3

0.90

Input high current

(VIN= OVDD

IIH

—40

μA

Input low current

(VIN= GND

IIL

–600

—

μA

Note:

1.Note that the symbol VIN, in this case, represents the OVIN symbol referenced in Table 1 and Table 2.

Table 31. MII Transmit AC Timing Specifications

At recommended operating conditions with OVDD of 3.3 V ± 5%.

Parameter/Condition

Symbol 1

Min

Typ

Max

Unit

TX_CLK clock period 10 Mbps

tMTX

—400

—

TX_CLK clock period 100 Mbps

tMTX

—40—

TX_CLK duty cycle

tMTXH/tMTX

—

TX_CLK to MII data TXD[3:0], TX_ER, TX_EN delay

tMTKHDX

TX_CLK data clock rise and fall time

tMTXR, tMTXF

2,3

1.0

—

4.0

Note:

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.

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