MPC8309EC datasheet(24/82 Pages) FREESCALE

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MPC8309 PowerQUICC II Pro Integrated Communications Processor Family Hardware Specifications, Rev. 0

Freescale Semiconductor

Ethernet and MII Management

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

Table 20 provides the MII transmit AC timing specifications.

Table 19. MII and RMII DC Electrical Characteristics

Parameter

Symbol

Conditions

Min

Max

Unit

Supply voltage 3.3 V

OVDD

—3

3.6

Output high voltage

VOH

IOH = –4.0 mA

OVDD =Min

2.40

OVDD +0.3

Output low voltage

VOL

IOL = 4.0 mA

OVDD = Min

GND

0.50

Input high voltage

VIH

——

2.0

OVDD +0.3

Input low voltage

VIL

—

–0.3

0.90

Input current

IIN

0 V

 V

IN  OVDD

—±5

A

Table 20. MII Transmit AC Timing Specifications

At recommended operating conditions with OVDD of 3.3 V ± 300mV.

Parameter/Condition

Symbol1

Min

Typical

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 VIL(min) to VIH(max)

tMTXR

1.0

—

4.0

TX_CLK data clock fall VIH(max) to VIL(min)

tMTXF

1.0

—

4.0

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, tMTKHDX symbolizes MII transmit

timing (MT) for 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).

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